Robert PD Frost & Co Ltd is a family business established in 1951 and it has steadily grown ever since. Initially Robert Frost manufactured models and instruments but his engineering skills increasingly led to work with injection moulds and plastic mouldings. The company grew around his love of problem solving and rising to challenges. 60 years later, we have earned a reputation for quality, reliability and value for money.





Robert PD Frost & Co Ltd

Plastic injection moulders, specialising in prototype and development moulding and toolmaking. We make plastic parts to customer specifications, serving all industries. The customer's tools are stored for production of mouldings as and when required. Most plastics are used ABS , PP , PA6 , HDPE , PC , PMMA,  COC , PA66 , PC/ABS PEI , PPS , PBT , and TPE .

Established in 1951

Robert PD Frost & Co Ltd is a family business established in 1951 and has steadily grown ever since. Initially Robert Frost manufactured models and instruments but his engineering skills increasingly led to work with injection moulds and plastic mouldings. The company grew around his love of problem solving and rising to challenges. 60 years later, we have earned a reputation for quality, reliability and value for money.


Mission Statement

Highest quality products at the lowest costs, that's the goal of the team at Frost's. Tip top tools and marvellous mouldings.

Buy British

  • Manufacture of prototype injection mould tools in Alumec 89 tooling plate & steel production moulds - single and multi-cavity
  • Product development & design expertise
  • Mould tool modifications as requirements change
  • Plastic mouldings made to order in any quanity
  • Assembly, reaming, packing, pre and post moulding operations-bespoke for each customer
  • Over moulding, core pulling & insert moulding
  • Manumould & arburg injection moulding specialists
  • Medical mouldings with clean room facilities
  • Reliable delivery and quality governed by ISO9001:2015

Our Facilities




Robert PD Frost & Co Ltd
45 Burrowfield
Welwyn Garden City
Hertfordshire
AL7 4SS
Phone +44 (0)1707 331188
Fax +44 (0)1707 393714

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