PROTECTION OF GLASS SURFACES

Level 3

To prevent glass surface deterioration, water and chemicals should not be allowed to dry on the glass.  This is especially important in storage.


CAUSES OF GLASS SURFACE DAMAGE

Level 3

Once installed, glass can withstand large amounts of water without significant surface damage.  However, water can accumulate when there is inadequate separation between lites in storage.  Even small amounts of water trapped in this way can cause surface deterioration.  Glass in contact with water enters into a series of complex chemical reactions which result in alkaline solutions.

PROTECTING FLAT GLASS SURFACES

Level 3

Flat glass must be protected during shipment and storage.  Only by proper handling and storage techniques can the integrity and clarity of the glass be assured before installation.

Glass Foundation : Glass Cleaning

Level 3

The following are things to DO and  NOT do.

Glass Foundation : Bent Glass

Level 3

Bent glass is fabricated from flat glass, which has been heated to between 1000°F (538°C) and 1100°F (593°C), gravity or mechanically formed, and then allowed to cool to the desired shape.


Glass Foundation : Insulating Glass

Level 3

In order to reduce heat gain or loss through glass, two or more lites may be sealed together to create an insulating glass (IG) unit.

Glass Foundation : Laminated Glass

Level 3

Two or more lites of glass and one or more interlayers of plasticized polyvinyl butyral (PVB) permanently bonded together under heat and pressure

Glass Foundation : Fully Tempered Glass

Level 3

Fully tempered glass is required in ASTM C 1048 to have either a minimum surface compression of 10,000 psi (69 MPa or an edge compression of not less than 9,700 psi (67 MPa) or meet ANSI Z 97.1 or CPSC 16 CFR 1201.

Glass Foundation : Heat-Strengthened Glass

Level 3

Heat-strengthened glass is produced with surface and edge compression levels less than fully tempered glass, as specified by ASTM C 1048. The lower compression levels yield a product that is generally twice as strong as annealed glass of the same thickness, size and type.

Glass Foundation : Annealed Glass

Level 3

Upon exiting the tin bath, the float glass ribbon is guided on rollers through an annealing lehr where it is cooled, under controlled conditions, until it emerges at essentially room temperature.


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