Plastic injection mold (aka injection mold in the UK) is a tool for manufacturing plastic parts, also makes the plastic parts have full structures and precise dimensions.
Why Make Plastic Injection Molds in China?
You may hear from someone that plastic injection molds from China are in low quality, but still there are many companies are buying injection molds from China, some of them with big volume demands even set their own sourcing office in China. Are those companies silly? No. 
The answer is China injection mold makers can manufacture high-quality molds as good as American and Europe companies with competitive lower price, this is why the plastic injection mold makers outside China lost their jobs to Chinese.
In China, now more and more plastic injection mold makers hire technical sales who are good at technique and English communication. As we all know, the technique requirement is the most important thing for an injection mold making project, and now a lot of Chinese mold salesman is good at CAD drawing, materials choosing and mold making process, so they can communicate with the partner engineers very well. To make a new plastic injection mold, the 3D drawing is the first thing and then analyze how to make the mold (size, structure, material, cut down the cost and so on), so the key point is how to make the suppliers' engineers and your companies' requirements connection. Just like our factory, we have cooperated with a German and United Kingdom companies for five years. We work well if you have a new custom mold making project next time, you can send your drawing to us to have a test.
After 30 years of developing, mold manufacturing becomes a mutual industrial in China, there are well developed industrial chain, many well-trained mold makers, well-educated business developing and project management employees. Despite they are paid 2/3 less than in the US, they make a first class mold like your mold maker did in the US.
Why Choose Our Company?
Were you able to find a good source for plastic injection molds? You may find out there are very few Chinese manufacturers that could satisfy your companies' needs. We are a Chinese company with our own tooling factory in Shenzhen China. We build very precise and high-quality plastic injection molds exclusively for companies from the US, Canada, UK, Germany, Italy etc. 
We have very good equipment including high-speed CNC, mirror EDM, slow wire cut, CMM, etc. Our mold engineers are good at English and mold technologies, so our company is easy to communicate with. Feel free to let us know if you are finding a plastic injection mold maker in China.
We are a unique hybrid solution for dealing with American and European companies but getting better Chinese prices. We will be glad to review your specifications and share them with our plastic injection mold makers as well for their input. We work on a cost-plus basis, we will give a very honest quotation to build what exactly you are expecting. We have a reputation for making only top quality molds and we stand behind our work. We think you will really like working with our company. We are also glad to give you the references of our many US customers that can tell you the kind of services we can offer.
The major reason that American and European companies source plastic injection molds in China is price, at the end of the day that is the major factor. However if we want to have a feel good discussion and ask what to look for when selecting a Chinese injection mold supplier we can look for the following:
References -- Get it from them and do your homework
Origin of Tool Steel
Capital investment in shop and equipment -- Is it a dive?
In place (established method) project plan that shows every aspect of build and give updates
Quality Systems
Validation Systems
Knowledge of your product -- Have they done this before?
How much capability do they have -- Can they do everything in-house?
Capacity and what is it at the moment you are placing your P.O.
Are they able to service you globally?
If your product is still in the concept stage, you only need to present your ideas, product features and appearance requirements. Our engineers will give you the best solution, recommend the most suitable materials, and help you take the lead in the market.
We are ready and looking forward to cooperate with your next project, Contact Us Now, you will be satisfied to choose us as your partner in injection mould manufacturing& injection moulding processing.
Why choose ACO Mold injection molding company to make plastic molds?
ACO Mold injection molding factory is located in Shenzhen, China. Shenzhen is a mature industrial base for Chinese mold industry. Shenzhen's industrial supply chain is rich, which is very convenient for injection molding manufacturing. If you choose to make molds in other regions, the supply chain is not perfect, the factory management system, quality control methods are backward, resulting in an infinite extension of the development cycle.
We are a one-stop injection moulding factory that provides injection mould design manufacturing, injection moulding, surface coating, electroplating and product assembly. We have more than 9,000 square meters of standard manufacturing plant, equipped with a full set of precision mould processing workshops and ordinary mould processing workshops, measuring instrument testing laboratory, injection moulding workshop, providing customers with one-stop high, medium and low-end injection moulds manufacturing Injection Moulding Product Assembly Services to meet customer product development needs. The factory is equipped with a series of equipment such as CNC machining center, engraving machine, spark machine, wire cutting, grinding machine, milling machine, drilling machine and lathe etc.
We are ready and looking forward to cooperate with your next project, Contact Us Now, you will be satisfied to choose us as your partner in injection mould manufacturing injection moulding processing.
This injection mold making project is a protective casing for electronic products, the material is ABS.
Warpage is usually caused by molded-in stresses. The issue of warpage is related to being a semi crystalline material, HDPE, being semi crystalline polymer, will have differential shrinkage along and across the flow leading to warpage. It is difficult to eliminate this problem just by optimizing processing parameter. If use of multiple gates is possible, that might help multidirectional flow leading to lesser warpage.
The two areas that will have greatest affect are injection mold temperature and gating being both location and type. Not knowing configuration or flow difficult to give specific advice, but think of the part on a molecular scale. Imagine the surface of part being interconnected crystals with cooling starting at coldest surface of injection mold which will be multiple points and spreading out in a circular shape all within fractions of a second. You want the coldest surface possible and repeatable and a flow front that fills mold as evenly as possible. The more even the flow front in relation to part configuration from one side across to other and a plastic injection mold surface temperature that is a uniform temperature will minimize warp. There are some design tricks that would also minimize warpage but you may past that point. As to type of gate, as large as possible so you are not adding heat through shear. Also monitor melt temp at nozzle, looking for lowest temp that will enable complete mold fill.
Last year we have made 2 sets of injection molds for a US company, the part we are going to mold is made in nylon, also called PA6, it looks like a simple part, but in actual practice, a few problems comes up, our specialists solved it eventually, it is supposed something we can learn and share.
Aco Mold have very strict standard procedure for all injection molds coming out of our factory, after the samples are approved by customers, all molds will be set up for a few hours running to confirm stable production situation so all molds arrive at customer's factory can gets right into smooth production.
We take good care of our customers regardless low volume or high volume injection molding order, once the order taken, your have our guarantee of quality, service and lead time. If your order is not being taken seriously by your molder or molding suppliers, please come to us and we let you talk with those small order customers we have served, you will then make your wise decision.
Medical devices usually make direct or indirect contact with human body, it has high standard requirements on mold design and mold making, typical characters of medical parts are high required finish surface, particular structure design, tight tolerance, and food safe material, it is a challenge to the mold makers and injection molding companies.
70% injection molds made by ACO MOLD are exported to US or European companies, these injection molds are usually required to be SPI Class 101, guaranteed 1 million cycles or more, mold standard apply to US or Euro local standard so it can be easily operated and maintained. 
Comparing with stay-in-house-molding mold, the export mold requires a higher capability to mold maker on not just how to make the injection molds but also how to work with US companies. Here we share with you a custom mold making project we have done in our factory, we are sure there would be much more on somewhere we can do much better and achieve much more satisfaction, we summarize it, look back and move forward for better and better customized mold projects made in China by ACO MOLD.
As an engineering and manufacturing company in the China specializing in plastic injection tooling and molding we have been battling what we call 'purchaser apathy' ever since low labor cost countries entered the market in the 80/90's. 
It has been too easy for the manager with the sign-off to pick the 'cheapest' quote without understanding what quality of engineering, tooling manufacture and partnership he is getting. The specifics of what we do does not lie now in actually 'cutting metal' this is largely computer controlled as "metal is metal" it is the service experienced before and after that adds the value.
What we find our customer value is us telling them no they can't do that because if they do it will impact total product quality or yes they can have an extra rib for strength in there but it will create a weld line right through their bose where the insert is going. Also find a company that has actual manufacturing on site as we do because it automatically aligns the customer and supplier goals (to make the tool as quickly as possible without compromising quality) why? Well because that's what we have here and if we quote a customer for tooling we must make it work and work to the best of it's ability for it to be a profitable and sustainable project.
I work for an OEM company, and we generally prefer United States injection molds for the following reasons. We have China injection molds in production now, but some of our experiences tend to make us prefer to keep tooling stateside.
Mold Design - We tend to get better designed molds in the USA. If the injection mold can be designed in the US and build in China, this has produced superior molds for us.
Lead Times - Maybe we just had a bad experience, but one injection mold seemed to take the slow boat across the ocean. The lead time wasn't competitive with a stateside mold.
Mold Trial - Generally not possible to be on hand for the initial injection mold trial in China.
Mold Modifications - We have gotten better/faster injection mold modifications when the mold was able to be sent back to the original mold maker in the USA. Sending the mold to China to be modified is cost prohibitive, so a 3rd party mold maker has to make the injection mold modifications.
Over the years we have been taken advantages of with the low cost of plastic injection mold manufacturing in China. You get what you pay for. I have heard of an injection mold cracking in half just last year from China, water poring out of it in the press. As an injection mold maker back in the 80's and 90's we started to see import steel making its way to our machines. We could tell on the CNC's or polishing we were not getting what we bargained for. After heat treat OMG, warp. We use to say they put old "bed springs" in the alloy mix. When drilling a hole in this steel it would not be constant feed rate by hand, you could feel the drill push easy then hard etc. So we had to be very precise in ordering our plastic injection molds with certification. We ordered 4 large injection molds from a Chinese manufacturer in 2004, the heat treat was horrible, we did not get our certification, it looked fake. Someone was trying to pull a fast one. I hardness tested several blocks from the plastic injection molds, not good. We spent approx $450,000 for those injection molds back in 2004 and we tried to outsource and handle the engineering real close. We tried to do everything real and it back fired. These injection molds were for electrical components and tolerances on my parts were critical, 4 to 8 cavity molds, the quality was just not there. Glass filled nylon wore down these plastic injection mold in 8 months, we had to retool.
Many Chinese injection mold making companies has also made significant progress in the CAE application, and achieved good results. CAE technology can greatly save the cost of test mode, shorten the development cycle, and has become an important means to ensure injection mold quality. CAE technology is gradually changing the mold design from experience to scientific.
At present, the China auto parts of high strength steel plate is also limited to structural parts and beam parts, the tensile strength of materials used in the 500MPa or less, therefore, quickly master the high-strength steel stamping technology is Chinese automotive mold industry to be resolved important questions.
Chinese injection molds cut major corners on water, mold steels, unless you really get after them to use good mold steels. I have seen Chinese plastic injection molds that literally warp in the press because their injection molds are the softness of lead. I have seen well-made Chinese molds, but again, the materials used have been sub-par. The delay in communications is also an ongoing problem. That's one reason I use America, UK or Italy over China -- never have to worry about any of the things previously mentioned. The only reason that Chinese injection molds remain more competitively priced is the fact that the country pegs its currency to the dollar, so you never see the true cost. In the near future, the Chinese will not be able to continue pegging their currency to US dollar especially when the dollar is getting trashed by our own government. Because of this weak dollar policy, it makes everyone except China very expensive. Yet, for our European friends, it makes US made stuff cost competitive. However, even with our virtually worthless currency, I still get 25-30% less costly tooling in Portugal.
We do plastic injection mold design in China, along with plastic product design and development, and other tooling requirements. We feel we offer a unique perspective in plastic injection mold and product design. Having decades of injection mold design experience allows us to incorporate the "moldability" factor into our product designs and evaluations.
We can manufacture the injection mold per you requests with competitive prices, as we have our own mold designers and mold making factory. The good part is that we will pay for the customers flight and accommodations to visit our factory in China during specific intervals. We will accompany the customer to our company. We would be very interested in discussing the possibilities of collaborating our design services with your manufacturing capabilities. 
Injection mold design is one of most important parts of a success mold making project, we currently have 6 great Chinese mold designers with more than 10 years design experiences. For each of mold project, we will call out an internal kick-out meeting to decide the part layout, runner design, gating way, ejection method, cooling layout, etc. These would allow us to always design your mold with all of our Intelligence resources instead of just by a single mold designer. We offer a unique perspective in plastic injection mold and product design. Having decades of injection mold design experience allows us to incorporate the "moldability" factor into our product designs and evaluations.
Our design/engineering technologies include:
Pro/Engineer/UG (3D)
AutoCad (2D)
Moldflow analysis (Plastic flow/deform simulation)
MasterCam (CNC Programming)
We provide DFM reports and give customers an overall view on manufacturability and part design, with our experiences and professional, we are able to predict the potential risks and come up with optimized solutions.
The parting surface is the surface which is convenient for the product can be taken out successfully. Therefore, the position of parting surface should be selected at the part with the largest product section size. This is a basic principle.
The injection mold parts in motion are guided by guide pins and guide sleeves. To ensure the a accuracy of injection, mold open and clamp, guiding system is essential.
As a good reputation manufacturer in China, we here share the basic injection mold making process in our company:
1. Products design department provides product information to injection mold design department, injection mold designers complete cost analysis in two working days, and provide to R&D manager.
2. R&D department release "Mold Making Apply" to plastic injection mold design department after confirmed the project.
3. Injection mold designers organize relevant personnel to review the project base on the product information, including product structure, mold structure, cooling system, runner, slag, venting, etc.
4. After evaluation, injection mold designers begin to design the plastic injection mold, including 3D drawing correction, 3D parting, mold parts assembly drawing, EDM drawing, electrode drawing etc., and organize relevant personnel to evaluate those drawings, then issue to plastic injection mold making department.
5. Injection mold makers evaluate and study the drawings, and order mold materials if there is no objection, otherwise, communicate with the plastic injection mold designers.
6. Injection mold makers inspect the mold materials in time after the materials arrive to factory, and arrange technicians to do locksmith works, include turning, grinding, milling, screw holes, water carrying hole, center hole, CNC roughing, etc. The technicians should pay attention to the precision of each right-angle sides, avoid empty of the center hole and each production base, roughing margin etc. Then outsource each mold part to heat treatment promptly.
7. After heat processing, plastic injection mold maker must detect its hardness and metallurgical analysis. Generally, the core hardness 46-50HRC, for uniform distribution of 9 points, requiring its hardness differ is less than 1HRC. Metallurgical analysis should be done for the injection mold core prior to processing to make sure there is no segregation, scars, etc.
8. Electrode processing, there are fine and rough processing, fine male spark is 0.08, rough male spark is 0.2 (subject to the actual situation). Be sure to pay attention to each processing benchmarks, and detect electrodes after processing finished.
9. Before finishing, must make right angle for the mold core, the vertical degree should less than 0.02 mm, finish degree 1.6.
10. For line cutting, please note that all parts' base, enlarge 0.02mm for the insert hole and center hole as tolerance clearance, for non-standard thimble, the tolerance clearance is 0.04mm of the actual thimble size.
11. Mold core finishing, shall base on the benchmarks after making right-angles, typically leaving 0.02 mm die as a margin (without considering tool wearing).
12. EDM processing, process according to the drawings' size, fine 0.08, rough 0.2 (subject to the actual situation), pay attention to the benchmarks in processing, for sparks processing, the leave a margin of 0.03-0.05 mm.
13. The runner surface must be polished to achieve ▽6 or ▽7 finishing, the surface does not allow spark or knife pattern exists.
14. Before assembling the plastic injection mold, the mold maker must do a comprehensive inspection for all related parts to make sure everything is in a good condition, and do cleaning and anti-rust treatment. Then fill "Mold Inspection Summary" form.
15. In tryout, injection mold designers, plastic mold makers and die casting workshop personal should go to the site, making analysis and solution of abnormal in casting tryout, improving the plastic injection mold and die casting process according to the results, and fill "Mold Tryout Report".
16. By 100-150 cycle time, the tryout products are defect-free, the production department make production schedule, the technicians track the production processes, and feedback yield to the plastic injection mold making department.
17. After tryout, plastic injection mold making department apply for storage with the forms of "Mold Making Apply" and "Mold Making Inspection".
Welcome to visit our company in Shenzhen China, you will be much happier to discuss technical questions with our experienced mold professionals and manufacture injection molds in our factory.
Injection mold making cost refers to the production cost directly related to the mold making process. There are too many mold types, and there will be differences in cost accounting. But the factors affecting mold making cost are basically the same. Taking the plastic injection mold as an example, to briefly introduce the injection mold making cost:
1. Injection mold base cost
The materials for mold base are usually S45C or S50C. The common mold base is standard parts. Injection molding factory in China generally order mold base of LKM. The standard mold base price is relatively cheap. But for the plastic products with too large size, which exceeds the size range of the standard mold base, requiring customizing the mold base. For example, the size of the commonly used large gate mold base ranges from 150mm x 150mm (referred to as 1515 series) to 600mm x 800mm (referred to as 6080 series). If the injection mold base size exceeds 600mm x 800mm, the injection mold base is required to be customized. The price of customized mold base is 2-3 times that of the standard mold base.
2. The material cost of the injection mold cavity and injection mold core are different depending on the characteristics of the injection molding materials and the mold service life. The commonly used mold steels for cavity and core are P20, 738, 738H, 718, 718H, NAK80, 2316, 2316A, S136 etc. The materials used for the harden mold are 2344, 8407, SKD11, SKD61etc.
ACO Mold is injection molding company located in Shenzhen China. We provide one-stop injection molding mold making service. We have more than 10 years experience in plastic manufacturing industry. In order to provide high-quality injection mold, we equipped advanced a series of equipment such as CNC machining center, engraving machine, spark machine, wire cutting, grinding machine, milling machine, drilling machine and lathe etc. Below is something you need to know about ACO Mold injection molding mold making.
We are a one-stop injection moulding factory that provides injection mould design manufacturing, injection moulding, surface coating, electroplating and product assembly. We have more than 9,000 square meters of standard manufacturing plant, equipped with a full set of precision mould processing workshops and ordinary mould processing workshops, measuring instrument testing laboratory, injection moulding workshop, providing customers with one-stop high, medium and low-end injection moulds manufacturing Injection Moulding Product Assembly Services to meet customer product development needs. The factory is equipped with a series of equipment such as CNC machining center, engraving machine, spark machine, wire cutting, grinding machine, milling machine, drilling machine and lathe etc.
We are ready and looking forward to cooperate with your next project, Contact Us Now, you will be satisfied to choose us as your partner in injection mould manufacturing injection moulding processing.
This injection mold making project is a protective casing for electronic products, the material is ABS.
Analyze the entire process of mold production, establish quality assurance system, and control the key factors that affect the quality of the mold, so as to improve the quality of the mold.
Medical devices usually make direct or indirect contact with human body, it has high standard requirements on mold design and mold making, typical characters of medical parts are high required finish surface, particular structure design, tight tolerance, and food safe material, it is a challenge to the mold makers and injection molding companies.
In the 10+ years we have been involved with publications serving the plastics industry, the number of unique plants doing plastic injection molding has ranged from 10,000 to 14,000+ in the booming years in the China according to data collected from subscribers. Not saying that is the universe, but it's likely reach to a high 90% of it. Currently, there are just over 11,000 plants doing plastic injection molding according to our circulation database with about 52% of those being custom injection molders and 48% captive or proprietary.
The precise number of custom injection molders has always been a bit elusive because almost half of plants are captive falling into end-market of China and typically corporate management of those companies don't think of themselves as a part of the plastics industry, only the plants within the organization making a pellet into a part do! All plastics product manufacturing where typically custom plastic processors are coded, with the lion's share of those plants likely being custom injection molders. The states with the most injection molding plant locations are Yangtze River Delta and Pearl River Delta. Dongguan had for years been number one, but that has recently changed most likely because of the changes in legislation and energy costs impacting manufacturing there.
There are more than 15 different processes which are used for molding and converting plastic into variety of end products. Injection molding is a one of the most common methods of producing plastics workpieces. It is a method of forming or molding objects from powdered or granular types of thermoplastic materials.
For any custom injection molding projects, injection mold and molding cost are critical factors for development team to decide whether to move forward with this method or not. Before getting an accurate and official quote from the supplier, you are supposed to provide these following details for review.
Mold is a tool for molding and processing of plastic parts. Mold making is an important but complex stage for plastic molding. Usually, the mold has two parts, an upper mold and a lower mold. Small up to the plastic molded parts for electronic connectors, large up to the plastic products for car dashboard, both of them can be molded with plastic mold.
ACO Mold injection molding company is located in Guangdong China, with more than 10 years experience in plastic molding manufacturing. We provide one-stop injection mold making service. We have strong R&D ability, to customize the plastic mold for your plastic products. We export exported mold and production mold, that is, if your product project is super large volume injection molding, we will recommend that you can order plastic injection mold from ACO Mold injection molding manufacturer and do injection molding at your local. Or you also can choose injection mold making and injection molding are all in ACO Mold injection molding company.
In the context of increasingly internationalized plastic molding manufacturing industry, shortening the product development cycle and reducing the risk of developing new product investments have become the key to the survival of product development companies. Custom plastic injection molding products have been widely used in automotive, aerospace, marine, home appliance, industrial design, medical, construction, handicraft production and children's toys etc. And the continuous development and improvement of this molding process of injection molding products itself will continue to expand its application range. In the automotive and home appliance plastic parts manufacturing industries, the injection molded parts account for 50% to 70% of plastic products.
Custom plastic injection molding products for baby carriage
The important position of the plastic injection molding products for baby carriage has no burrs, and the requirements for some sections difference are extremely high, and are controlled within 0.03mm. The glue position of the plastic products is relatively thick, and the injection molding cycle is required to be short. Due to the high and complex cooling requirements during plastic injection molding, and the plastic products are mostly deep and easy to deform. So ACO Mold injection molding company has made pre-deformation for product development companies in the early stage of plastic injection mold making.
Judge the injection mold quality is mainly from below 4 aspects:
1. Injection molding plastic products quality
The dimensional stability and conformity of injection molding plastic products, the surface finish of injection molded parts, and the utilization rate of plastic molded parts materials, etc can reflect the quality of injection mold itself.
2. Service life
Under the premise of ensuring the quality of plastic injection molded parts, the number of work cycles that injection mold can perform or the number of plastic parts produced.
3. The usage and maintenance of injection Mold
Whether it is most convenient to use, whether it is easy to demold, and whether the production auxiliary time can be as short as possible.
4. Maintenance cost, maintenance cycle
The time of injection mold maintenance cycle and the cost of maintenance are also included in the assessment of the quality of injection mold.
Why choose ACO Mold injection molding company to make plastic molds?
ACO Mold injection molding factory is located in Shenzhen, China. Shenzhen is a mature industrial base for Chinese mold industry. Shenzhen's industrial supply chain is rich, which is very convenient for injection molding manufacturing. If you choose to make molds in other regions, the supply chain is not perfect, the factory management system, quality control methods are backward, resulting in an infinite extension of the development cycle.
Household appliances are a large application area in injection molding products. Almost all household appliances are made of plastics, just the type of plastics that are used in different electrical appliances is different.
PP is also called polypropylene, because of its good anti-breaking performance, also known as "100 fold glue." PP is a translucent, semi-crystalline thermoplastic with these performances such as high strength, good insulation, low water absorption, low density and high crystallinity etc. The PP which has different uses has a large difference in fluidity. PP flow speed is between that of ABS and PC.
Due to meet the insert holes, the region where the flow speed is discontinuous and the region where the filling flow is interrupted, the molten plastics in the cavity meet in the form of multiple strands. At this time, there will be a linear welding seam because it can’t be completely fused. In addition, in the case of gate injection molding, a welding seam is formed, and the strength at the welding seam is poor. There are the main reasons.
Silver Streaks in injection molded parts include surface bubbles and internal pores. The main cause of defects is the interference of gases (mainly water vapor, decomposition gas, solvent gas, air). There are the specific reasons.
What kind of styling you want? Plastic molding can precisely give a specific shape in the molten plastic state. Today plastics are used widely instead of traditional glass, wood and other materials because of its high durability. Using a variety of technologies to shape the plastic into the desired shape, plastic injection molding is one of today's most valuable and cost-effective molding technologies.
DFM is one of the most important procedures before making injection mold, through DFM procedure, our engineers with rich experiences bring all the design problems on the table to avoid any failures or reworks afterwards, no matter how you are confidence with your design, get a second idea from an injection mold maker like ACO Mold, it probably would save you a lot of cost and shorter your whole lead time. For example, the heavy wall thickness on coaster lid would cause serious sink mark if you don't reduce the excessive material.
One of advantages of plastic parts is they can be made in any color you want, and unlike metal parts, it is easy to do plastic parts in different color. Most of the consumer products need to be colorful, your cell phone, you car, color could be one of key reason your clients pay for your product. So how to define the color and customized your product is one of the important factor to achieve big sales.
Here are some custom projects we made for different customers, due to Intellectual Property Protection propose, there will be only pictures present here. Please note all the molds/parts are custom made exclusively for certain customers, anyone interested in distributing these products should contact directly with our customers.
Here is a part used as water line holder in garden
Plastic material: PP
Color: blue
Size: 570x200x20mm
We take good care of our customers regardless low volume or high volume injection molding order, once the order taken, your have our guarantee of quality, service and lead time. If your order is not being taken seriously by your molder or molding suppliers, please come to us and we let you talk with those small order customers we have served, you will then make your wise decision.
Low cost production
China labor cost is still much lower than US, during past 10 year, China labor is rising every year, it's about 500USD-1000USD/ month, but please don't forget the productivity of individual labor increase as well. Low cost production is still one of the main reasons that China maintains the advantages in injection molding industry.
Quality guarantee
Quality of made in China have been labeled bad, still, look around you, there are not just low quality made in China, but also some of the best quality product, like Apple iPhone, iPad, all the molds/ injection molding are done in China. What you need to do is keep your eyes open to find a good injection mold supplier. You can't not deny that lower quality products exited in everywhere, even in United States.
One of advantages of plastic parts is they can be made in any color you want, and unlike metal parts, it is easy to do plastic parts in different color. Most of the consumer products need to be colorful, your cell phone, you car, color could be one of key reason your clients pay for your product. So how to define the color and customized your product is one of the important factor to achieve big sales.
Where to find the color
You should know pantone, Pantone is the X-Rite, Incorporated, a wholly owned subsidiary, is the authority of a specialized research and development of world-renowned color, also the color systems and leading technology provider of professional color choice in many industries. When it comes to color choice, you need to have a pantone card, finding the most adorable color you like, of source, many researches may need to be involved in before choosing one. Pantone number is a universal color code you can simple give your molder a color number and you will get what you want. 
Pantone card 
Color samples
How an injection molder do the colored samples
Once you provide the color code, we can produce the color pigment to match the color code. Raw material and color pigment will be mixed by certain ratio base on actual situation, it may need some adjustment on the ratio, Goal is they match color pigment.
Key factors to mold colored parts
Clean your injection machine barrel: Make sure the injection machine barrel is clean to make sure there is no contamination, slight contamination in barrel could cause high scraps rate
Setting proper molding temperature: it happens the mold samples have black spots all over the surface of the molded parts, this could be the reason of the temperature are setting too high during molding.
Diffusion: some of the resin melt flow property is not very good, such as PC or PC/ABS, in that case you need use grain color pigment instead of color powder to make sure resin and color pigment are properly mixed. If you don't, the molded part may have uneven color.
Fix the injection parameter: colored molded parts may be different from batch to batch, this is something you can't avoid completely due to condition changes all the time, but control the pigment resource stable and setting the injection molding parameter can make the difference as unnoticeable as possible.
We have made a lot of colored molded parts for many customers, here are a few project.