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Setting The Standard

SRS is a division of Goodwin Refractory Services Ltd, who have been serving the jewellery, industrial and aerospace industries for over 60 years. GRS and its sister companies are now the Global market leaders in the manufacture and supply of Investment Plasters.

A Complex Process

A complex manufacturing process is backed up by exhaustive raw material control testing and in-house quality control. It goes without saying that SRS operate ISO9001. SRS handle naturally occurring minerals and have become experts in producing consistent finished products to the tightest specifications.


  • 65,000 Tonnes Manufactured per year
  • 2.9 Million Sacks (22.7kg Sacks)
  • 7 Manufacturing Plants throughout the World
  • 120 Distributors Worldwide
  • Global team of 14 R&D chemists and 35 laboratory technicians
  • Accredited ISO 45001:2018 and ISO 9001 Quality Management


SRS continues to invest in an in-house research and development laboratory. Our expert technicians are striving:

  • To make better products which exceed customer requirements
  • To understand our own products better through scientific analysis
  • To become the leading producer in our field through product performance

Service & Support

At SRS we are driven by the desire to support our partners and customers worldwide, with the highest standard of service possible:

  • We listen and understand what you need
  • We solve problems using experienced jewellery technicians
  • We want to build better global relationships

Quality Control

Alongside developing product quality, our laboratory staff test every batch of product, to the limit, to ensure it meets our exacting standards:

  • ISO9001 quality system guarantees consistency from batch to batch
  • Only the highest quality raw materials sourced, to ensure the best finished products
  • Test castings produced as part of the ISO9001 process
  • Continuous improvement of the quality system