Intumescent coating in 1970s: UK/DE approvals · 491

Intumescent coating (acid source + carbon + spumific (typical APP/PER/MEL)) is a family of grades whose density wet film as specified, heat band designed to foam ~200–300 °C, and fire letter coating on A1 steel; system tested. Intumescent coating is sold as grades, not as a single substance. Chemistry acid source + carbon + spumific (typical APP/PER/MEL), density wet film as specified, heat band designed to foam ~200–300 °C.

This atlas treats Intumescent coating as a system: mill route, coatings, tests and the cavity it sits in. Conductivity note: char foam becomes the insulator. Insulation score 70/100 is relative to 32 entries — metals lose, VIPs and aerogels win. Fire letter in editorial use: coating on A1 steel; system tested. Do not equate A1 with “safe in a blaze” or E with “illegal”. Assemblies decide.

Origin: 1960s–70s commercial IFR; cellulosic vs hydrocarbon curves, US / UK / DE. The process chapter follows feedstock → conversion → forming → finish → install. Uses span buildings to defence / safety. Pairings matter: steel. Circularity mark 42/100. Ask which scrap, which certificate, which year.