Gypsum board in 1916: Sheetrock · 475
The behaviour of Gypsum board is written as 1916’s “Sheetrock,” fixed by 0. An advert’s adjective is not a melting point. “Room temperature” alone is not a figure. Gypsum board is sold as grades, not as a single substance. Chemistry CaSO4·2H2O + paper faces, density ~700–1000 kg/m³, heat band calcines ~80–180 °C (dehydration).
Gypsum board (CaSO4·2H2O + paper faces) is a family of grades whose density ~700–1000 kg/m³, heat band calcines ~80–180 °C (dehydration), and fire letter A2-s1,d0 typical; core A1. This atlas treats Gypsum board as a system: mill route, coatings, tests and the cavity it sits in. Conductivity note: ~0.17 W/m·K. Insulation score 34/100 is relative to 32 entries — metals lose, VIPs and aerogels win.
Fire letter in editorial use: A2-s1,d0 typical; core A1. Do not equate A1 with “safe in a blaze” or E with “illegal”. Assemblies decide. Origin: Sackett 1894; US Gypsum 1916, United States. The process chapter follows feedstock → conversion → forming → finish → install. Uses span buildings to defence / safety. Pairings matter: mineral-wool.
Circularity mark 62/100. Ask which scrap, which certificate, which year. Related atlas entries, a short glossary, and three threads that keep Gypsum board honest. Timber frames that need this lining. EN 13501-1 reaction-to-fire letter (A1–F), not a wall rating. Thermal conductivity in W/m·K. Lower means better bulk insulation.
“Sheetrock” for Gypsum board in 1916 carries 0. Praise without that figure is not a property.1916
Figures to keep
- Year of the condition
- 1916
- Property figure
- 0
- Material
- Gypsum board
- Use line
- Sheetrock
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