General Guide for Glass

All types of glazing

 for use in building should be such that the physical and chemical characteristics can be considered constant over time. They should be:

a) insensitive to photochemical effects, i.e. the spectral properties (transmission of light and solar energy)

are not modified by direct or indirect solar radiation.

b) insensitive to attack from the environment, i.e. surface deterioration will not develop after glazing

under normal conditions of use, provided the glass is cleaned at reasonable intervals.

General Dimensions

Thickness - The methods for the determination of glass thickness are given in the relevant product standard, e.g. BS EN 572-2 for soda lime-silicate float glass.

Tolerances - The tolerances on thickness are given in the appropriate product standard. They are reproduced in this standard in tables relating to the availability of that particular product.

 

General Length, width and squareness

The method for the determination of length, width and squareness are given in the relevant product

standard, e.g. BS EN 572-2 for soda lime-silicate float glass.

Tolerances - These are given in the relevant product standard. They can relate to both stock and finished sizes depending on the product. They are not reproduced in this standard.