Protomold logo

Injection Moulding

Protomold Injection Moulding offers low- to mid-volume part production from real engineering-grade thermoplastic and liquid silicone rubber materials in less than three weeks. Protomold is often used for prototyping, shortrun manufacturing up to 10,000+ plastic parts and bridge tooling before moving to large-scale manufacturing. Along with plastic injection moulding our liquid silicone rubber (LSR) moulding processes produce quantities of 25 to 5,000+ LSR parts.
Mould pricing starting at
£995. Get 25-10,000+
parts in 1-15 days.

Plastic Injection Moulding

Protomold plastic injection moulding part example
Rapid injection moulding uses the industry standard production process for parts, so it’s an excellent predictor of manufacturability when you move to large-scale production.

Liquid Silicone Rubber Moulding

Protomold liquid silicone rubber part example
LSR molding is a thermoset process that mixes a two-part material together, which is then heat cured in the mold to produce a final part.
Why Injection Moulding?
Protomold stocks hundreds of thermoplastic resins that offer a variety of benefits for many different applications and industries. Liquid silicone rubber provides additional material option. Here are some of our more frequently used injection-moulding materials:
See full list of materials
  • ABS
  • Acetal
  • Acrylic
  • HDPE
  • LDPE
  • Nylon
  • PBT
  • Polycarbonate
  • Polypropylene
  • TPE
  • TPU


Small quantities of prototypes are often manufactured through our machining process, but injection moulding is also utilised for a few reasons. Product developers can get a short run of parts made in real plastic and liquid silicone rubber materials while simultaneously vetting a part design for moldability.
Protomold prototyping


Bridge tooling helps fill the manufacturing gap that occurs while waiting three to four months for production tooling to be ready. Our injection-moulding process uses aluminum moulds to quickly and efficiently produce a run parts for pilot production or market testing before large-scale production begins.
Protomold tooling


If volume needs don’t justify expensive steel production tooling, Protomold can supply low- to mid-volume production parts made in engineering-grade materials that meet full manufacturing requirements. Multi-cavity aluminum moulds can be very cost effective, and we ensure that the tools last for the life of a project.
Protomold production
Protomold suite of services
Proto Labs manufacturing processes can take your product from idea to market launch fast. Injection moulding is often used towards the end of the prototyping cycle when low-volume production begins.
Automated Interactive Quotes
When you have a 3D CAD model ready, simply upload it to receive an interactive quote within hours that contains free mouldability analysis and pricing information. We accept all major 3D CAD file formats. See accepted file formats.
Accepted file formats for upload:
• IGES (.igs)
• STEP (.stp)
• SolidWorks (.sldprt)
• ProE (.prt)
• Parasolid (.x_t and .x_b)
• ACIS (.sat)
• AutoCAD (.dwg, 3D only)
• Autodesk Inventor (.ipt)
• Compressed folders (.zip)
“I have been a machinist for over 30 years and I have machined moulds, but now that I am involved the designing process, Proto Labs’ design tools and support was like having my own mould designing team to bring our product to market.”
— Darrell Freeman, Blue-White Industries Ltd
A properly equipped tool belt of resources can prove invaluable no matter what stage of production you’re in. Our website contains a library of helpful content and free design aids.
Protomold plant floor