Toughened glass sheet

Details Toughened glass sheet Toughened glass sheet

1998-06-25

2000-08-01

Jones, Deborah

Glass manufacturing

Processes

Glass preform treating

65104, 65115, C03B 2700

Patent

active

060949430

ABSTRACT:
A toughened glass sheet for use as a windowpane of an automotive vehicle. The toughened glass sheet has a thickness ranging from 2.5 mm to 3.1 mm and has a first characteristic that a number of fragments is not less than 40 within an area of 50 mm.times.50 mm in a fragmentation test in which an impact is applied to a predetermined position of the glass sheet with a hammer or a punch, and a second characteristic that a specified height is not less than 2 m in an impact resistance test in which the specified height is a value at which the glass sheet is broken upon dropping a steel ball having a weight of 227 g.

REFERENCES:
patent: 4662926 (1987-05-01), Aratani et al.
patent: 4735646 (1988-04-01), Aratani et al.
patent: 5112377 (1992-05-01), Aratani
patent: 5127932 (1992-07-01), Aratani
patent: 5362689 (1994-11-01), Morimoto et al.
JIS R 3222, 1996, "Heat Strengthened Glass" (Japan--no English translation).
JIS R 3211, 1992, "Safety Glass for Road Vehicles" (in English and Japanese).
JIS R 3212, 1992, "Test Method of Safety Glass for Road Vehicles" (in English and Japanese).

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