Online Injection Molding Service

Plastic prototype and on-demand production injection molding. Get free injection molding quotes and design feedback within hours.

  • Rapid Tooling Production as fast as 2 weeks

  • ISO 9001:2015 certificated

  • 24/7 engineering support

Certifications
ISO 9001:2015 | IATF 16949 Registered

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Our Injection Molding Capabilities

Rapid Protos’ custom plastic mold injection molding services are ideal for quickly manufacturing high-quality, low-cost parts. From making plastic prototypes to making mass production moulds. A strong network of manufacturing facilities and supply chains ensures parts are made the way you need them, at the right price. We provide expert consultation on each injection mold quote and support each order with a project manager on mold design, material and finish selection to move your part from design to production.

Our injection molding services offer hundreds of materials, plastics (ABS PC, ABS, PA, PVC, PEI, HDPE, LDPE, PEEK, PA, PC, POM, PP, PS, TPE, TPU etc..), metals (stainless steel , aluminum, etc.) or composite materials (PA glass, etc.), and process injection molding, casting, blow molding and vacuum forming. Contact us for a quote.

plastic injection molding

Plastic Injection Molding

In plastic injection molding, a barrel of resin is heated until it melts. The molten resin is then shot into a mold to make a thermoplastic part that can be used in production.

silicon injection molding

Liquid Silicone Rubber Molding

Liquid silicone rubber molding is a thermoset process in which a two-component compound is mixed together and then heated in a mold with a platinum catalyst to make a final part.

insert injection molding

Overmolding & Insert Molding

Overmolding and insert molding are two-part injection molding processes where one material is put on top of a second substrate part or metal insert to make a single part.

What is Injection Molding?

Injection molding is used to create strong, durable plastic parts and is ideal for manufacturing projects with high-volume production requirements. . In injection molding, molten plastic is injected into a mold, cured and pushed out, repeating itself over and over again. Since the same mold is used for each part during injection molding, the quality of each part is the same. High-volume manufacturing has a very low cost per unit, so it can be used to manufacture a variety of products and parts, from the smallest medical injection devices, electronics housings, to large automotive trims, aerospace equipment housings, and more.

injection molding

How it Works？

Plastic Injection Molding Process

Plastic injection molding is the process of filling a liquid plastic resin into a mold under enormous pressure. Molds can contain a single cavity or hundreds of cavities, and the following steps are repeated to make an unlimited number of parts.

  1. Clamping: Both sides of the mold are closed and clamped.
  2. Injection Molding: Plastic pellets fed into the machine are mixed and heated until completely melted, forming a liquid resin. A screw press then injects the liquid resin into the mold – this is called “injection”.
  3. Cooling and Solidification: The mold is cooled for a short period of time to allow the internal parts to solidify into the shape of the part.
  4. The mold is opened: After cooling, the part is ejected and a new cycle begins.

Features of Injection Molding

Injection molding is plastic manufacturing process that can produce high quality parts at scale. It’s typically used for low- to high-volume production but our aluminum tooling can also make prototyping runs economical.

  • Low cost at higher volumes
  • Exceptional part cosmetics and surface finish
  • Repeatable
  • Complex parts
  • Low scrap rate
  • Large selection of thermoplastic and thermoset materials
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Gallery of Injection Molding Parts

Check out our extensive gallery that shows precision machined prototypes and parts from our valued customers.

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Why Choose Us for Custom Injection Molding?

Quick Lead Times

Using injection-molded components can shave off weeks or even months from the production timeline. Because of this, you may start making things quicker. Injection molding orders are sometimes shipped the same day they are placed.

Design for Manufacturing Feedback

Every quote includes an analysis of the design and pricing in real time. We look at your 3D CAD and help you find any parts that might cause problems during the molding process, like undercuts that are hard to machine or not enough draft.

No Minimum Order Quantities (MOQs)

Buying parts on demand, without minimum order quantities (MOQs), helps you deal with changes in the market or in demand. It also gives you a cheap source for bridge production, line-down emergencies, end-of-life production, or customizing products.

Injection Molding Expertise

We will assist you in every step of the process, from prototyping to manufacturing, including the selection of finishes and the documentation of inspection results.

Accurate Quotes at No Additional Cost

Rapid Protos can help accurately your ordering and manufacturing process through an in-house self-developed quotation assistance system and accurate quotations by engineers with more than ten years of experience. And give the cheapest and fastest manufacturing process feasible solution, stop wasting money and time through incorrect manufacturing process. Engineers can obtain the optimal processing technology (CNC processing, 3D printing, mold injection molding, etc.) Your accurate quotation and delivery time will not delay your project development progress.

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24H Instant Quotation

Just upload your design files, and you can get instant CNC quotations and right-most manufacturing solutions from experienced engineers within 24 hours. Offer you competitive pricing through our network of suppliers.

DFM Feedback

Our platform uses a self-developed semi-automatic graphic-assisted quotation system and experienced engineers to cooperate with the quotation, which can accurately give the optimal solution for complex parts, and each quotation has been manually reviewed by engineers to provide you with comprehensive comprehensive solutions for your customized CNC parts. Manufacturing design analysis.

1 VS 1 Customer Service

Provide one-on-one customer service, 24 hours email, phone and live chat to understand all stages of the production process and all aspects of manufacturing operations. Professional engineers provide design and manufacturing process troubleshooting, allowing you to order worry-free.

Instant Free Quote

Injection Molding Fabrication Standards

To ensure part manufacturability and precision of fabricated prototypes and parts, our custom sheet metal fabrication services are in compliance with the ISO 2768-m.

ServiceDetails
Lead TimeStarts at 7 business days, including 24-hour quote responses
Production LocationChina
MaterialsMost plastics, see materials list below
Machines AvailableSingle, multi-cavity; 50 to 1,100+ press tonnage;
Inspection and Certification OptionsISO 9001, AS9100, ISO 13485, UL, ITAR
Tool OwnershipCustomer-owned with mold maintenance
Mold Cavity Tolerances+/- 0.005″ when machining the mold and an additional +/- 0.002″ per inch when calculating for shrink rate
Part to Part Repeatability+/- 0.004″ or less
Critical Feature TolerancesTighter tolerances can be requested and may increase the cost of tooling because of additional sampling and grooming.
Available Mold TypesSteel and aluminum; production grades range from grade 105 (prototype tooling) to grade 101 (extreme production tooling).

By default, sharp edges will be broken and deburred. For any critical edges that must be left sharp, please note and specify them in your drawing.

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Injection Molding Materials

We have wide selection of more than 100 thermoplastic and thermoset materials. And if you’re looking for alternative material options, check out our guide to resin substitutes for ABS, PC, PP, and other commonly molded plastics.

  • ABS
  • ABS/PC
  • Acetal
  • Acetal Copolymer
  • Acetal Homopolymer/Delrin
  • ETPU
  • HDPE
  • LCP
  • LDPE
  • LLDPE
  • Nylon
  • PBT
  • PC/PBT
  • PEEK
  • PEI
  • PET
  • PETG
  • PMMA (Acrylic, Plexiglas)
  • Polycarbonate
  • Polypropylene
  • PPA
  • PPE/PS
  • PS
  • PSU
  • TPU

Surface Finishing Options For Injection Molded Parts

Surface finishing is important if you want to make your 3D-printed prototypes or production parts stronger, last longer, look better, or even work better. Check out these different ways to finish your project, and you’re sure to find one that works for you.

ImageNameDescriptionColorDetail
sanding and polishing processing 300x200Sanding and PolishingThis process involves sanding the surface of the 3D printed part with increasingly finer grits of sandpaper, followed by polishing with a polishing compound to achieve a smooth surface finish.n/aLearn more >>
painting processing 300x200PaintingPainting the surface of the 3D printed part is a simple and effective way to improve its appearance and protect it from environmental factors. A range of paints and finishes can be used, including spray paints, airbrushing, and powder coating.any colors you wantLearn more >>
Chemical Treatment processing 300x200Chemical TreatmentsChemical treatments such as acetone vapor smoothing can be used to dissolve and smooth the surface of 3D printed parts made from ABS or similar materials. Other chemical treatments can be used to coat the surface of the parts with a protective layer or to alter their properties.n/aLearn more >>
Electroplating processing 300x200ElectroplatingElectroplating can be used to coat the surface of 3D printed parts with a thin layer of metal, improving their durability, conductivity, and appearance. Common metals used for electroplating include gold, silver, and copper.Aluminum, steel, stainless steeln/a
Heat Treatment processing 300x200Heat TreatmentHeat treatment involves subjecting the 3D printed parts to high temperatures, which can help to improve their strength, hardness, and resistance to wear and tear.n/aLearn more >>
Laser Etching processing 300x200Laser EtchingLaser etching can be used to create intricate designs and markings on the surface of 3D printed parts, which can be useful for labeling, branding, or creating custom textures.n/aLearn more >>
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Ultimate Guide to Injection Molding Fabrication

To help you get the most out of injection molding manufacturing, we’ve put together this complete guide to the basics of the technology. It can help you decide if it’s the best choice for your project and make the perfect plastic part.

Injection Molding Applications

Injection molding is widely used for plastic part production in medical, consumer, and automotive industries. Typical parts include:

  • Housings
  • Brackets
  • Gears
  • Single-use medical parts
  • Electrical connectors
  • Syringes
  • Containers
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Let’s Start A Injection Molding Project Today

Frequently Asked Questions

With bigger part volumes, injection molding makes sense because of the one-time cost of the mold tooling. The price of our molds begins at $1200 but varies with the shape and complexity of the component being molded. The price of injection molding will also be affected by the length of time it takes to make and the type of material used.

Yes, we do. It’s called “on-demand manufacturing,” and it’s a way to get production tools. This tooling option has a number of benefits, including a lower price per part, the ability to make parts with more than one cavity, guaranteed tooling for the life of the project (we’ll cut a new tool if the old one wears out), and first-article inspections.

Most of the time, we can keep a machining tolerance of +/- 0.003 in. (0.08 mm) with a resin tolerance that can be greater than +/- 0.002 in./in. (0.002 mm/mm) but no less than +/- 0.002 in./in.

With plastic injection molding, the biggest size we can handle is 18.9 inches by 29.6 inches by 8 inches (480mm x 751mm x 203mm).

A wide variety of industries benefit from the highly versatile process of injection molding, including:

  • Medical & Pharmaceutical
  • Eletronics
  • Construction
  • Food & Beverage
  • Automotive
  • Toys
  • Agriculture
  • Consumer Goods
  • Sporting Goods

Injection molding is a fast, cost effective and highly precise manufacturing process used for mass producing complex molded parts in a variety of materials, including thermoplastics, polymers, aluminum, and glass.

There are several types of injection molding processes, including:

  • Custom plastic injection molding
  • Overmolding
  • Insert molding
  • Cube molding
  • Die casting
  • Gas-assisted injection molding
  • Liquid silicone rubber injection molding
  • Metal injection molding
  • Micro injection molding
  • Reaction injection molding

How long an injection mold can last depends on several factors: mold material, number of cycles, operating conditions, and time between production runs. The life expectancy of an injection mold can range from 1M+ cycles to less than 500 cycles based on the above criteria.

Although quite similar, the difference between forming and molding comes down to their unique features and benefits, depending on the application they are being used for. Injection molding is more suitable for large production runs of small, intricate parts and involves injecting liquid polymers into a mold using extreme pressure and temperatures. Thermoforming, also referred to as vacuum forming, is more suitable for shorter production runs of large-scale designs and involves forming heated plastic sheets to a mold’s surface.