06-18-2022, 01:02 AM
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#21 (permalink)
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duckduckgo.com/?q=spray+insulation+with+vacuum+spheres&ia=web
Quote:
https://www.compositesworld.com › articles › microspheres-fillers-filled-with-possibilities
Microspheres: Fillers filled with possibilities - CompositesWorld
Spray drying produces discrete, uniform hollow spheres in sizes ranging from 5 µm to 50 µm in diameter. Significantly, the use of phenolic resin, which is naturally fire resistant, provides fabricators a nonhalogenated flame-resistant filler with far less mass than other flame-retardant fillers, such as alumina trihydrate (ATH).
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