Fiberglass
Glass fiber
Glass wool
B 1%, Ca 1.7%, K 1.2%, O 20.2%, Si 7.5%,

estimated elemental composition and empirical formula weight 
Commercial product likely to contain propriety (non-disclosed) ingredients and additives.

Gram formula weight (molecular mass) = 659.69
Solubility in organics = insoluble


Made from waste glass or the usual glass raw materials.
Wikipedia Page:

Glass fiber
is defined with respect to the entities below:
The entities below are defined with respect to:
Glass fiber
Glass (generic)


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