of Lightpull Mills, Stroud, Gloucs. London Office at Regent Street, W1. Birmingham Office at Coleshill Street. (1922)
Ditto all addresses. Telephone: Stroud 810 (5 lines). Cables: "Erinoid, Stroud". (1947)
- 1909 Casein plastics, derived from milk, were developed by Erinoid.
- 1914 Erinoid Ltd of Rodborough, was established at Lightpill Mill, near Stroud. The firm manufactured plastic using casein, a substance derived from milk by a patented dry process.
- The factory quickly became the main source of casein plastic in the UK, producing at least 5 tons a week at the start of the First World War.
- 1922 British Industries Fair Advert (double page) for Erinoid - The New British Insulating Material. A Non-Inflammable Substitute for: Celluloid; Bone; Amber; Ebonite; Horn; Coral; Fibre; Ivory; Jet; Vulcanite; Tortoiseshell; Turquoise. Ideal for Turning and admirably suitable for: Electrical Fittings and Accessories; Buttons, Beads, Combs and Hair Ornaments; Cigarette Holders; Knife Handles; Pencils and Penholders; Hat Pins; Umbrella and Stick Handles; Organ Stops; Piano Keys, etc. (Stand No. K.51) 
- The business continued to expand rapidly, and employed over 500 people by 1933.
- 1947 British Industries Fair Advert as Manufacturers of Modern Plastics Materials: Casein; Cellulose Acetate; Vinyl Plastics; Polystyrene; Oil Soluble Synthetic Resins. (Plastics Section - Earls Court, 1st Floor, Stand No. 808) 
- In 1973, when 700 people were employed, the factory also made polystyrene and articles in thermo-plastic materials for use in the electrical and building industries.
- The Stroud-based factory remained the major producer of casein plastic right up to the 1980s, when it ceased manufacture faced with a dwindling market.
Sources of Information
-  Gloucestershire County Council
 Science Museum Collections