The Choice of Experience

A company with a global reputation for high quality consistent products,
world class technical support and excellent customer service.

Welcome to Castaldo

A brand with a global reputation for high quality consistent products, world class technical support and excellent customer service.

Castaldo products are manufactured in 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.

Ownership Change

As of the 31st January 2020 F. E. Knight has sold the Silicone Rubber, RTV Rubber and Wax division of its business to Goodwin Refractory Services Ltd (GRS), based in the United Kingdom. Many of you know this company and the reputation it has for manufacturing, selling and technically supporting its products. – Read Full Deails

New Castaldo Website

A new Castaldo website has been created with enhanced Technical information and data sheets related to the range of products that are on offer.

For the range of products that F.E.Knight has retained and have on offer please visit the Knight jewelry products website or contact [email protected]

Silicone Jewelry Molding Rubber

All Castaldo Silicone Jewelry Molding Rubbers make superior quality molds that are tough, strong, easy to pack, easy to cut and easy to use.

RTV Silicone Molding Rubber

RTV silicone is a liquid silicone compound that cures at room temperature to form a flexible rubber. The term RTV is means Room Temperature Vulcanising.

Injection Wax

Superior quality waxes for a full range of applications, producing patterns that are very flexible, resilient and durable with great memory while still being easy to work with and to inject.