Glass compositions

Details Glass compositions Glass compositions

1974-12-23

1977-03-29

Douglas, Winston A.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 52, 106 54, 106 99, C03C 1300, C03C 304, C04B 3106

Patent

active

040147053

ABSTRACT:
Alkali-resistant continuously-drawn glass fibers, for use in the reinforcement of cement products, are composed of SiO.sub.2 67 to 82 mol.%, ZrO.sub.2 7 to 10 mol.%, R.sub.2 O 9 to 22.5 mol.% (where R = Na, up to 5 mol.% of which may be replaced by Li or K), F.sub.2 3 to 9 mol.% and Al.sub.2 O.sub.3 (computed as AlO.sub.1.5) 0 to 5 mol.%, the permissible maximum value of the total of SiO.sub.2 + ZrO.sub.2 + AlO.sub.1.5 being on a sliding scale dependent on the content of ZrO.sub.2 and ranging (when F.sub.2 = 9 mol.%) from 89 mol.% when ZrO.sub.2 is 7 mol.% down to 87 mol.% when ZrO.sub.2 is 10 mol.%, the said maximum value being reduced by a further 5 mol.% over the whole scale when F.sub.2 = 3 mol.%. The fiberizing temperature is below 1350.degree. C and the liquidus temperature is at least 40.degree. C below the fiberizing temperature. Preferably, to ensure that the fiberizing temperature is below 1320.degree. C, the said maximum value of SiO.sub.2 + ZrO.sub.2 + AlO.sub.1.5 is further reduced by 1 mol.% over the whole scale.

REFERENCES:
patent: 2640784 (1953-06-01), Tiede
patent: 2882173 (1959-04-01), Welsch
patent: 3013888 (1961-12-01), DE Lajarte
patent: 3294557 (1966-12-01), DE Lajarte
patent: 3783092 (1974-01-01), Majundar
patent: 3861926 (1975-01-01), Irlam

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