Intumescent coating in 1970s: UK

Scores compare Intumescent coating with the rest of the atlas on strength, heat, fire behaviour, insulation, workability and circularity. They are editorial, not certificates. Seven chapters follow. Fire and insulation claims name test families (Euroclass, ASTM E84, ISO 5660, KS F) rather than inventing a single safety number.

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.