About Castaldo

As of the 31st of January 2020 Goodwin Refractory Services Ltd (GRS) acquired the Silicone Rubber, RTV Rubber and Injection Wax division of F. E. Knight Inc.

GRS acquired as part of the acquisition the Castaldo brand name and trademarks. For the time being all Silicone Rubber, RTV Rubber and Injection Wax will continue to manufacture all products at our site in Franklin, MA.

Orders for Castaldo Silicone Rubber, RTV Rubber and Injection Wax products are to be as normal to be sent to Castaldo at info@castaldo.com.

F. E. Knight will continue to manufacture and sell its range of Castaldo branded Natural Rubber products and associated tools under their new Knight Jewelry Products banner. Please note that this is now a standalone business entity from Castaldo and orders for Natural Rubber products and associated tools will now need directing to www.knightjewelryproducts.com.

GRS and its sister companies have been involved in the manufacture and sale of high quality silicone molding rubbers for the jewelry industry for over ten years. In addition to this our new liquid silicone rubber factory opened in 2020 and we look forward to expanding the range of Castaldo liquid silicone products over the coming years.

GRS has a global reputation for high quality consistent products, world class technical support and excellent customer service and we are looking forward to integrating the Castaldo Silicone Rubber, RTV Rubber and Injection Wax division into our product range.

GRS is an ISO 45001:2018 and ISO 9001 Quality Management accredited company that continually invests in R&D and understands the requirement of close customer relationships combined with a world class technical support network. In each of our five manufacturing locations we have locally based highly trained quality control and technical sales teams which offers a bespoke service to our customers supported by the UK headquarters.