Injection mold & Low volume injection molding company
From part design to final delivery

Stebro Mold Co Ltd is a full-service injection plastic mold maker & Low volume plastic injection molding company in China. We specialize in manufacturing mould for plastic injection and provide injection molding service. Our services includes outdoor power equipment, medical devices, and industries of electrical, electronic and automotive. Over 10 years, We offer professional service of plastic product design, plastic mold flow design and plastic mold design. All of our designs are of manufacturability to save the mold cost for our customers. We also can make thermoplastic injection molds such as 2K injection molds, unscrewing molds, multi-cavity molds, multiple action molds, insert molds and over molds. Besides, injection molding low to high volume production and contract assembly is also inside our service area. We are good at making difficult-to-process engineering resins, high temperature material like PEEK and PSU, metal replacement and precision plastic components.

We understand the importance of paying attention to plastic mold details to ensure customer satisfaction. As a professional injection plastic mold maker, our mold engineers will work closely with you to design your injection mold. Both our plastic parts design process and injection plastic molds manufacture will be quality and efficient. Stebro injection mould company takes single-source and vertical integration technology, with new tooling. The technology makes the transition of injection molding easier and more flexible. We can handle your T-0, T-1 sample and short-run production timely. We ensure that they can be shipped and totally utilized in your future production before your launch your program.

Greater cost savings can be realized simply from streamlining the supply chain through a successful relationship with the right injection mould company. A good plastic injection mold company will be able to act as a single source of supply, helping to design a part for manufacturability, build the best mould for plastic injection, select the right materials, mold the part, and provide any secondary operations required. Choosing Stebro plastic mold maker will help you shorten the product development cycle, and get your plastic products on the market faster. 

Full-stack Plastic Molds Manufacturer

As a professional plastic mold company in China, Stebro Mold design and manufacture different kinds of plastic molds for you.

2K Injection Mold
Over Molds
injection mold prototype
Insert Molds
Custom Injection Mold
Production Mold

Plastic Product Design & Engineering

Stebro mold provide plastic product design & engineering , We help you to optimize the plastic product design & development for your plastic products to save your time and cost in plastic injection mold design, injection mold manufacturing & molded part assembly.

Rapid Prototype Manufacturing

Prototype design is very important for plastic product manufacture. Stebro plastic mold maker provide plastic rapid prototyping services and complete product development, including CNC prototyping, SLA plastic prototype , SLS plastic prototype, Vacuum Casting and Low Volume Injection Molding.

Plastic Injection Mold Tooling Manufacture

Stebro plastic mold maker offer injection mold manufacturing, mold maintenance, transfer tooling services. We ensure that injection molds are properly designed, built and maintained properly throughout the life of your plastic manufacturing program.

Plastic Injection Molding

Besides plastic mold maker, we are a full-service custom plastic molding company. Our plastic molding manufacturing service are from complete product development to mass part production in China. Low & High Volume Injection Molding, Insert Molding, Over Molding & Vertical Injection Molding are all available.

Advantages of Our Injection Molding Service
&Mould for Plastic Injection

Early Supplier Involvement for plastic part design optimization, design for manufacturability, eeasibility wtudy and moldflow

Advanced Mold manufacturing equipment, Rich experience in plastic tooling and injection molding manufacturing

10% discount price than other Chinese mold manufacturers , Fast Delivery Time, Flexible Payment Terms and Trade Terms.

One Stop Services From Part Design To Final Delivery, Prototype to Production Molds, Low Volume to High Volume Part Production

 

Stebro china plastic mould factory is ISO 9001:2015 Certified. PPAP to ensure all requirements are documented, understood and reliably implemented.

Focused on Customer Satisfaction, Technical Sales Support To Communicate Through All Stages of the Project. Lifetime Mold Guarantee

How Customers Say About Stebro Plastic Injection Mould Company

Thank you for your attentive and specialized direction during our cooperation. This is the first time that I meet a plastic mold company like you who are prepare to help us. And I believe you are expert in plastic injection molding! Good job!

Stebro is a perfect plastic mold partner, every question I met has been solved appropriately. They are efficient and experienced plastic mold company, hope for the next cooperation when I start plastic injection moulding items production!

Customers always prefer high quality plastic products, so do we. It’s very pleasure for me to collaborate with you. your mould for plastic injection is totally reach our products standard. I have introduced Stebro plastic mold company to our agency. Expect for more cooperation!

Stebro Mold Co Ltd plastic injection mold company not only focus its services on injection mold design and injection plastic molds manufacturing, they also bring much more added value than other plastic injection molding companies in China.

Outdoor Power Equipment

Automotive Plastic Mold

Electrical and Electronic

Medical Device

Plastic Molds making & Plastic Molding Knowledge Base

A plastic injection mold costs vary according to the mold’s size,material, mold design complexity. However, no mater you are seeking an mould company or plasticmolding company, Stebroplastic mold co ltdwill provide you more affordable price than other plastic injection molding companies.

Common Uses for Injection Plastic Mold

Mould for plastic injection, known as Injection plastic molds, is commonly used for producing high volume plastic parts. With a large plastic injection molding machine, injection plastic molds can output large plastic parts. With a smaller plastic injection molding machine, injection plastic molds can make precise and small plastic products for medical applications. In addition, there are many types of plastic additives that can be used in the injection plastic molding process, increasing its flexibility for product designers and engineers.

Stebro Mold Co Ltd as a professional injection plastic mold maker, is still trying to provide excellent injection molding service for its customers. We have R&D basement and will connect with our customers during the whole cooperation. Perfect injection molding parts and professional service than other plastic mold maker are our pursuing.

Why Choose injection plastic mold makers in China

Many companies have found that injection plastic molds manufacturing overseas is cost-effective. You may probably heard bad stories about the Chinese injection plastic molds being of low quality. But the outsourcing market of plastic injection molds China has grown steadily, there are many plastic manufacturing companies all over the world that continues to buy China plastic injection molds or China plastic injection molding service; some of them placing big volume orders and some even opening their own office in China to source injection plastic molds from injection mould company in China.

  1. China plastic mold makers can provide lower price with high quality. In China, there has lots of plastic mold makers and injection molding manufacturers as you known, thus there has a fierce competition in injection molding industry. This situation takes a result that Chinese plastic mold makers & plastic injection molding companies could provide higher quality with lower price. Though Chinese molding price is lower than Europe, the quality it provides is no less excellent than Europe.
  2. Efficient collaboration. Chinese injection molding manufacturers always work closely with their customers. Stebro injection mould company not only provide injection plastic molds and injection molding service for our customers, we also prepare to solve any problem which may confuse our customers at any time. And our service begin at you connect with us at first time, and no end even you receive our molded plastic parts or mould for plastic injection . We are your sincere partner all the time.
  3. Policy. Since Chinese government had published the reform and opening-up policy, the value of trade has soared. Nowadays, China has a comprehensive system of import and export, preferential tariff policy. All of them attract enterprises over the world make business collaboration with Chinese plastic injection mold company and plastic injection molding companies.
    Read more: How To Choose A Right Plastic Injection Molding Company in China?

Finding an injection plastic mold maker as your molding partner is a good choice. Creating molding business which China plastic mold maker will take lots of advantages for you than cooperate with other plastic mold maker.

How much does it cost to make a plastic injection mold?
Generally speaking, the cost of making plastic injection molds depend on following factors.
1.Mold Raw Material: Tow block-like steels, which can be shaped as needing parts. Different material has different cost. Select quality and affordable material is optimal decision for plastic injection molds making.
2.CAD/CAM: Injection molds manufacturers have to create a 3D mirror image of the item for machining the raw material. Plus the fixtures needed for the injection mold to work.
3.Machining: If you want to create a complex shape of mold, the injection mould company need a 5 aixs machining center, which may cost you around $80/hr to $120/ht.
4.Finishing: This process can polish the surface, and will take a long time.
5.Quality Assurance: Checking dimensions and quality of the plastic injection mold by a coordinate machine to ensure the injection mold has high-quality.
Nearly all plastic injection molds were made by these processes. Different cost may come up in different choice of mold material, the size and design of your molds.
There is a formula of mold price:
Mold Price = Material Fee + Design Fee + Processing Fee & Profit+ Value Added Tax + Trial Test Fee + Package Shipping Fee

Usually, a plastic injection mold costs between $1,000 to $90,000.

Mold Steel for Plastic Injection molds

Steel selection in the plastic mold can be as critical to the success of a plastics application as the selection of resin is to the end use performance requirements of the Plastic Injection Molded Product. The correct steel hardness must be determined to maintain the proper balance between wear and toughness so tooling components don’t wear out prematurely.

Material GradeHardnessCharacteristicsApplication
IMPAX 718HPrehardened, HRC36-42
Pre-hardened type, high purity with isotropic microstructure
contains 1.0% Ni
High quality mold inserts, best suitable for PA,POM, PS, PE, PP, ABS Material
STAVAX S136Heat treatment to HRC48-52High purity, high polishability to mirror finish, with good
corrosion resistance and low distortion after heat treatment.
High quality mold inserts with mirror surface finish and good
corrosion resistance, anti-corrosive cooling channel, best suitable for PVC, PP, EP,PC, PMMA material
STAVAX S136HPrehardened, HRC31-36High purity, high polishability to mirror finish, with good
corrosion resistance and low distortion
High quality mold inserts with mirror surface finish and good
corrosion resistance, anti-corrosive cooling channel, best suitable for PVC, PP, EP,PC, PMMA material
ORVAR 8407Heat treatment to HRC48-52Hot work tool steel with high toughness and good high
temperature strength
Die casting, extrusion, cold hobbing, best suitable for PA, POM,PS, PE Material
NAK 80Prehardened, HRC40-43Pre-hardened type with high hardness, good
polishability,excellent photo-etchingability, good EDM machining and
weldability
Custom plastic molds require high wear resistance and excellent surface
finishing.
P20HHPrehardened, HRC36-42With special chemical composition adjustment and good forging process/forging ratio, mechanical properties are better than normal AISI P20 tool steels.Mold inserts, best suitable for PA,POM, ABS material
LKM2311Prehardened, HRC29-35Pre-hardened type tool steel.Molds for high quality plastic with long run production
LKM2312Prehardened, HRC29-35Excellent machinability, most suitableable for high speed
volume machining.
Mold for general use and core parts
LKM738Prehardened, HRC29-35High quality pre-hardened type tool steel, uniform in hardness
and high machinability
molds with high toughness and good finishing.
LKM738HPrehardened, HRC36-42High quality pre-hardened type tool steel, uniform in hardness
and high machinability
Custom plastic molds with high toughness and good finishing.
LKM2083Heat treatment to HRC48-52Hardness can be obtained up to 50 – 52 HRC with proper heat
treatment in order to obtain better polishability, wear resistance and/or corrosion resistance
Corrosion resistance plastic molds
LKM2083HPrehardened, HRC29-35Pre-hardened type, corrosion resistance, high polishabityCorrosion resistance plastic molds.
LKM2316 Prehardened, HRC29-35Pre-hardened type, high corrosion resistanceCorrosion resistance plastic molds.
H13Heat treatment to HRC48-52Good toughnessSuitable for hard custom plastic molds, sliders, zinc die casting
dies.
1.2343Heat treatment to HRC48-52Good high temperature strength and high toughness, good
resistance to heat checking
Suitable for die casting
for aluminium and zinc alloys, hard plastics molds.
1.2344Heat treatment to HRC48-52Good high temperature strength, suitable for die casting.Suitable for die casting for aluminium and zinc alloys, hard plastics molds.
Plastic Injection Molds Surface Finish

Polishing and Texturing are the two main considerations for the injection mold steel surface.

  • Polishing: Polishing is a manual process that removes machining marks on the plastic mold surface and provides a uniform finish.
  • Texturing: There are several ways to texture a plastic mold surface such as sand blasting, EDM or Etching.

The choice of surface finish needs to be established very early in the design phase. The reason for this is because the finish type influences the tooling that needs to be used during the manufacturing process. The rougher the finish, the higher the draft angle needed to be able to easily eject the part from the custom injection molds. No matter what kind of surface finish you desire, Stebro Mold will be sure to exceed your expectations.

Finish TypeFinishing MethodTypical surface roughness Ra (μm)Description Results
SPI A-1Grade #3, 6000 Grit Diamond Buff
0.012 to 0.025Super High Glossy Polish
SPI A-2Grade #6, 3000 GritDiamond Buff0.025 to 0.05High Glossy Polish
SPI A-3Grade #15, 1200 Grit Diamond Buff0.05 to 0.1Normal Glossy
SPI B-1600 Grit Paper0.05 to 0.1Fine Semi-Glossy
SPI B-2400 Grit Paper0.1 to 0.15Medium Semi-Glossy
SPI B-3320 Grit Paper0.28 to 0.32Normal Semi-Glossy
SPI C-1600 Grit Stone0.35 to 0.4Fine Matte
SPI C-2400 Grit Stone0.45 to 0.55Medium Matte
SPI C-3320 Grit Stone0.63 to 0.7Normal Matte
SPI D-1Dry Blast Glass Bead #110.8 to 1Satin Textured
SPI D-2Dry Blast #240 Oxide1 to 2.8Dull Textured
SPI D-3Dry Blast #24 Oxide3.2 to 18Rough Textured
Milling Machine Surface 3.2 with visible machining marks 
VDI Surface   
Mold Tech Surface   
Special Texture according to the samples   
Injection Molds Design & Mold Construction Engineering

Once we understand your needs and optimized the part design, we will start the mold design. The main goal of mold design and tooling is to create a product with highest possible manufacturability. That means a high-quality process that is simple and efficient, long-lasting, easy to operate and maintain, and that meets all customer specifications—all at the lowest possible cost. From flow analysis to runner and gate sizing to cooling analysis to venting recommendations to temperature and pressure sensor recommendations, we’ll look at every aspect of injection mold design to ensure your custom injection molds are as close to perfect as possible.

Stebro Mold Co Ltd manufactures a wide range of custom plastic molds from prototypes to complex final production molds. Our custom injection molds types including:

Singel Cavity Molds A single-cavity mould produces a single plastic product per injection molding cycle, For the low volumes injection molding, we suggest to use single cavity injection molds.
Multi-Cavity  Molds A multi-cavity mould produces more than one plastic product per injection molding cycle. Multi cavity mold are used to increase production rate.
Family Molds Family molds are used to produce two or more different components in one injection cycle. Family mold reduces overall tool manufacturing cost because in this two different parts are manufactured with one mold.
Hot Runner Injection Mold Hot runner injection mold consists of two plates that are heated using a manifold system. In this system, runners are heated to keep injected thermoplastic in molten state. runner is situated internally in the mold. Therefore runners are not ejected with molded parts. 
Cold Runner Injection Mold Cold runner molds are two plate or three plate molds. In this, runners are not heated up. Therefore after the injection cycle sprue, runner and gate are cooled with molded parts. As a result, runners and gates are ejected with molded parts.
2K Injection Molds 2K Injection mold, known as two color Injection mold, two shot mold, twin-shot mold, dual-shot mold, double color mold, double shot mold, 2K mold and 2K tooling
Over Molds Two injection molds, one mold for the hard material and the other one for the soft material.
Insert Molds

Plastic custom injection molds for insert injection molding.

Unscrewing Molds, Rotating-Core Molds

Unscrewing actions are used for threaded features. The material is molded around the unscrewing action and once cooled, the action turns and unscrews itself from the part.

Gas-Assisted Injection molds

A special custom injection mold for Gas-Assisted Injection molding.

3 plate molds

Three plate injection mold consists of two parting planes and mold splits in three sections. Therefore runners and components can be located on different parting planes. In three plate molds, the runner is ejected separately to the molded part. 

2 plate molds

2 plate molds consist of one parting plane and the mold splits at parting plane. In a multi cavity two plate mold, runner and gate must be in parting plane. So that they can be ejected when mold splits. 

MUD molds

MUD mold includes a standard injection molding frame that utilizes a number of inserts in order to define the shape of the internal cavity (and thus the eventual part)

Side-Action Molds

Side actions are special features that are designed into a mold to help achieve tricky part features such as lifters, sliders, Collapsible Core and Unscrewing Action.

Collapsing-Core Molds

Collapsible cores release circular undercuts and can be used for threaded features. The part is molded around the core and once cooled, the core collapses to allow the part to be removed from the mold.

Prototype Molds

Prototype injection mold also called soft mold, test mold, development mold or pre-production mold, it can be built quickly to produce plastic prototypes and low volume parts to test the form, assmbly and function of the parts.

SPI Class 101 Molds

Extremely high volume production injection tools built for lifetime cycles exceeding one million.

Plastic Injection Molds Life Guarantee

Injection mold lifetime stands for the number of moulding cycles a mold can make before it needs to be replaced. Any injection mold will be subject to wear.
Plastic injection mold wear will occur particularly to ejectors, gates, slides and other moving parts. Surface finishes such as high gloss polish or sparked finish will also become less defined over time. The mold wear mainly depends on below items: Mold complexity, Injection Mold Steel, Injection Molding Material, Mold setter skill and regular mold maintenance. If the Injection mold have lots of actions such as sliders, lifters, unscrewing mechanisms with many small core pins, molded with high glass-filled material, the moldlife will be shorter than a simple injection mold molded with PP material.

You can take an estimate for mold’s lifetime, which will help you determine whether or not a plastic injection mold live up to its estimated performance. If your injection mold only completed 180,000 before breaking down, while the expectancy of the injection mold was 250,000 cycle, the reason for this performance might be that the operation of molding process is too faster and wear and tear were happened. But the problem might also lies in the mould design. As a professional plastic molding company,we will provide perfect solutions to solve your molding defects.

As long as we’re running your parts in our manufacturing facility, your mold is covered with a lifetime warranty, that means we will maintain, adjust, repair or replace the mold as needed, at no cost to you within the mold lifetime. And in this feild Stebro plastic mold maker promise we have advantages than other plastic mold makers.

Plastic Injection Molds Maintenance & Repair

Once an injection mould has run a set number of cycles; inspections, maintenance and cleaning should be performed. Regular maintenance and cleaning can improve the shot quality, which ensures consistent plastic parts quality. Injection mold repairs can be costly, so it is important that your injection plastic molds maker provide regular maintenance, cleaning, and if necessary, repair, to protect your mould investment and maintain consistent production. At Stebro Mold Co Ltd, we stand behind our injection mold tooling. As long as the plastic injection mold remains with us we will guarantee that mold for life. There will be no repair or maintenance cost on your injection mold service in China.

Plastic Injection Molds Tooling Transfer

If your current custom plastic mold maker or custom injection mold supplier unable or unwilling to meet your needs and you have a need to change the supplier, you can trust Stebro Mold to expertly handle your tooling transfer projects. Our customers rely on our expertise to successfully manage tooling transfer programs ranging from one mold to 20 molds. Our in-house tooling department can quickly analyze your tooling and complete any required maintenance or repairs prior to sampling. Throughout the tooling transfer process, we keep you posted with regular status updates, starting with a tooling diagnostics report that provides a snapshot of your tooling condition. Status reports are provided to keep you informed of our progress as we complete tooling repairs, sampling, and part inspection. We recognize that tooling transfer programs can be costly and we are cognizant of this when completing a transfer program. Our goal is to get you up and running as quickly as possible, with minimum financial impact.

Stebro Mold Co Ltd as a professional molding manufacturer, understands yours needs to get your ideas and products to market faster than your competitor. Whether you are looking for a prototype mold in China to get parts quickly, a bridge mold to manufacture parts until your production mold is up and running, or a production mould capable of low or high run volumes, our in-house part design, Rapid CNC prototypes, injection mould design, mould maker, and mold sampling ensures accurate plastic parts with the productivity you need. Having everything under one roof is extremely helpful in providing quicker lead times and keeping everything under our control.