Glass in 1350: Tempered
Read the condition on Glass before the nickname. Year 1350, line “Tempered,” figure 2. Skip a step and the properties chapter is describing a different object. A material is what it is made of, the condition it survives, and where it goes afterward. Glass under “Tempered” in 1350 should say which, with 2 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 Glass 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.
Glass (SiO2–Na2O–CaO (typical soda-lime)) is a family of grades whose density ~2.5 g/cm³, heat band softens ~500–700 °C, and fire letter A1. Glass is sold as grades, not as a single substance. Chemistry SiO2–Na2O–CaO (typical soda-lime), density ~2.5 g/cm³, heat band softens ~500–700 °C.
This atlas treats Glass as a system: mill route, coatings, tests and the cavity it sits in. Conductivity note: ~1 W/m·K. Insulation score 28/100 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.
The label keeps Glass, 1350, and 2. “Tempered” is the condition on the figure.1350
Figures to keep
- Year of the condition
- 1350
- Property figure
- 2
- Material
- Glass
- Use line
- Tempered
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