Tempered glass is a type of safety glass used in buildings and automobiles to diminish risk of injury whether the glass breaks. Horizontal tempering moves the glass over the furnace on rollers in a horizontal position. This can assent a slight wave caused by the rollers, on the contrary it is normally not visible to a informal onlooker. Horizontal furnaces are the bounteous current line of tempering glass in end nowadays.
Regulations
The elementary patent is said to be held by Rudolf Seiden, an Austrian chemist who emigrated to the USA in 1935. Pittsburgh Plate Glass Co. developed Herculite tempered glass in 1938 nevertheless stopped producing it within a uncommon senility as the convention focused on accepted float glass.
Types
There are two processes that are used to brew tempered glass. For vertical tempering, the glass is held in a vertical position by metal tongs and moved over the furnace. Tong marks are left on the border and normally cannot be seen whether the glass is installed in a frame. It has been in end in that approximately 1940, with immeasurably increased necessitate in the gone 50 agedness. The duty for safer glass and the evolvement of building and motorcar safety regulations has driven the necessitate for tempered glass manufacturing.
Origins
Tempered glass was developed in the early 1900s, though no particular lifetime is established.Safety regulations for glass started in the 1960s in response to a rising figure of injuries caused by broken glass in buildings and automobiles. These regulations enormously increased the demand for tempered glass, causing an increase in the number of glass companies in the 1970s and 1980s.
ANSI Standards
The Accredited Standards Committee, working under the auspices of the American National Standards Institute, developed the American National Standard for Safety Glazing Materials Used in Buildings in 1966. The current version is ANSI Z97.1-2004. According to the "Glass Informational Bulletin," ANSI Z97.1 is a voluntary safety performance specification and test method.
CPSC Standard
The U.S. Consumer Products Safety Commission adopted the Safety Standard for Architectural Glazing Materials in 1977, known as CPSC 16 CFR 1201. It was last amended in 1982. The CPSC is a federal standard that mandates when and where safety glass must be used.
Federal Specification DD-G-1403B
Federal Specification DD-G-1403B was developed by the General Services Administration in 1972 and modified in 1983 to regulate the use of heat-strengthened and tempered glass in building construction. This specifies the strength requirements that must be met to qualify as heat-strengthened or tempered glass.
