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This is a list of some physical properties of common glasses. Unless otherwise stated, ... thermal expansion, ppm/K, ~100–300 °C 9 3.5 10 7 0.55 7.3 Density
Borosilicate glasses have fairly low coefficients of thermal expansion (7740 Pyrex CTE is 3.25 × 10 −6 /°C [78] as compared to about 9 × 10 −6 /°C for a typical soda–lime glass [79]). They are, therefore, less subject to stress caused by thermal expansion and thus less vulnerable to cracking from thermal shock .
ZBLAN glass samples. The different colors correspond to different compositions of glass. From left to right: praseodymium doped, erbium doped and non-doped ZBLAN glasses. ZBLAN is the most stable, and consequently the most used, fluoride glass, a subcategory of the heavy metal fluoride glass (HMFG) group.
In addition to about 75% SiO 2 and 8–12% B 2 O 3, these glasses contain up to 5% oxides of alkaline earth metal and alumina (Al 2 O 3). This is a subtype of slightly softer glasses, which have thermal expansions in the range (4.0–5.0) × 10 −6 K −1. [11] This is not to be confused with simple borosilicate glass-alumina composites. [12]
Nightvision and thermal imaging play similar -- but very distinct -- roles on the modern battlefield. Soldiers utilize night vision to illuminate their darkened surroundings while thermal imaging ...
For $200,000 you can see the world through these green-colored glasses. 2. Dolce & Gabbana DG2027B — $383,609 ... a Swiss watchmaker and jeweler, this eyewear boasts 60 grams of 24 carat gold in ...
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