War to Peace Production: Plastics --The conversion of British factories to meet peace-time demands. Development in the Plastic Industry. Our Photograph shows a radio cabinet made from phenol formaldehyde moulding powder coming from the press at the Walthamstow Woks of De La Rue plastics Ltd., where men and women operatives turned out, among other essential war-time products, plastic hand-grenades. July 21, 1946. (Photo by United Kingdom Information Office).