Boron-free glass fibers

Details Boron-free glass fibers Boron-free glass fibers

C - Chemistry, Metallurgy

03

C

C03C 13/02 (2006.01) C03C 3/087 (2006.01) C03C 13/00 (2006.01)

Patent

CA 2223603

Boron-free glass fibers suitable for textile and reinforcements are described. The glass fibers have compositions consisting essentially of SiO2, CaO, AL2O3, and MgO. In a preferred embodiment, the glass contains essentially no fluorine, sulfate, or titania These glass fiber compositions advantageously have broad or large values for delta T (i.e., the difference between the log 3 or forming temperature--the temperature at which the glass has a viscosity of approximately 1000 poise--and the liquidus temperature), e.g., a delta T of at least about 125°F (52°C), more preferably of at least about 150°F (83°C).

Fibres de verre sans bore destinées aux textiles et à des renforcements. Les fibres de verre présentent des compositions renfermant essentiellement SiO2, CaO, Al2O3, et MgO. Dans un mode de réalisation préféré, le verre ne contient sensiblement pas de fluor, de sulfate ou d'oxyde de titane. Ces compositions de fibres de verre présentent avantageusement des valeurs larges ou élevées pour delta T (c'est-à-dire, la différence entre le log (3) ou la température de formation - la température à laquelle le verre présente une viscosité d'approximativement 1000 poises - et la température de liquidus), par exemple, une valeur delta T d'au moins environ 125 DEG F (52 DEG C), idéalement d'au moins environ 150 DEG F (66 DEG C).

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