Mineral wool in 1871: US slag wool · 504
Read the condition on Mineral wool before the nickname. Year 1871, line “US slag wool,” figure 0. DFT, thermography, mill certificates. A material is what it is made of, the condition it survives, and where it goes afterward. Mineral wool under “US slag wool” in 1871 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.
This atlas treats Mineral wool as a system: mill route, coatings, tests and the cavity it sits in. Conductivity note: λ ~0.032–0.040 W/m·K typical batts. Insulation score 86/100 is relative to 32 entries — metals lose, VIPs and aerogels win. Fire letter in editorial use: A1. Do not equate A1 with “safe in a blaze” or E with “illegal”. Assemblies decide.
Origin: Slag wool 19th c.; glass wool 1930s, US / Germany / Denmark. The process chapter follows feedstock → conversion → forming → finish → install. Uses span buildings to defence / safety. Pairings matter: polyurethane-foam. Circularity mark 58/100. Ask which scrap, which certificate, which year.
Related atlas entries, a short glossary, and three threads that keep Mineral wool honest. Lower λ, combustible unless protected. When service temperature exceeds stone wool. EN 13501-1 reaction-to-fire letter (A1–F), not a wall rating. Thermal conductivity in W/m·K. Lower means better bulk insulation.
The label keeps Mineral wool, 1871, and 0. “US slag wool” is the condition on the figure.1871
Figures to keep
- Year of the condition
- 1871
- Property figure
- 0
- Material
- Mineral wool
- Use line
- US slag wool
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