And do not say the thickness of the grade ~ ~ For example, car class ~ ~ construction level
Flat glass flat glass is not processed by other flat glass products, also known as white glass or clean glass. According to the production method is different, can be divided into ordinary flat glass and float glass. Flat glass is the largest in the building glass, the most used one, mainly for doors and windows, from lighting (visible light transmission than 85% 90%), enclosure, insulation, sound insulation and other effects, but also further processed into other technical glass The original film. Flat glass according to its use can be divided into window glass and decorative glass. According to the national standard "ordinary flat glass" (GB4871-1995) and "float glass" (GB11614-89), the glass according to its thickness can be divided into the following specifications: pull the production of ordinary flat glass: 2mm, 3mm, 4mm, 5mm four categories. Float glass: 3mm, 4mm, 5mm, 6mm, 8mm10mm, 12mm seven categories. The width of the glass produced by the drawing method shall not be greater than 2.5, of which 2,3mm thick glass size shall not be less than 400mm × 300mm, 4,5,6mm thick glass shall not be less than 600mm × 400mm. Float glass size is generally not less than 1000mm × 1200mm, 5,6mm up to 3000mm × 4000mm. In accordance with national standards, flat glass according to its appearance quality classification grading, ordinary flat glass is divided into superior products, first-class goods and second-class three grades. Float glass is divided into three grades: superior grade, first grade and qualified product. At the same time, the curvature of the glass shall not exceed 0.3%.
