Gypsum board in 1894: Sackett Board · 474
Read the condition on Gypsum board before the nickname. Year 1894, line “Sackett Board,” figure 0. CNC and tows, not judgement of grade. A material is what it is made of, the condition it survives, and where it goes afterward. Gypsum board under “Sackett Board” in 1894 should say which, with 0 tied to the condition. A figure with no condition is a boast. Readers meet the name on the back of a product, so the code and the history should not share one sentence.
Scores compare Gypsum board 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.
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. 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).
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.
The label keeps Gypsum board, 1894, and 0. “Sackett Board” is the condition on the figure.1894
Figures to keep
- Year of the condition
- 1894
- Property figure
- 0
- Material
- Gypsum board
- Use line
- Sackett Board
Gypsum board in 1916: Sheetrock · 475Next essayAll 1000 essays1000