TYPE OF 

DAMAGE

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MECHANICAL SURFACE - DAMAGES

The different intensities and degrees of interference of scratches on glass surfaces

can be described as follows:

ANGEL HAIR

Angel hair - scratches are extremely fine. Surface scratches that is neither visible nor palpable under normal daylight conditions. 

HAIR SCRATCHES

Hair scratches are fine, usually only visible against a dark background or glass scratches that can be seen on closer inspection and marking. Glass scratches that is visible but not palpable. 

WEAK GLASS SCRATCHES

Weak glass scratches are usually easily visible scratches in diffuse daylight and against a dark background. Glass scratches that can be felt with the fingernail.

STRONG GLASS SCRATCHES

Strong glass scratches are highly visible damages. They are visible from any angle and against any background. Glass scratches clearly noticeable with the fingernail. 

SCRAPINGS

Scrapings are extensive damages, which usually consist of a scratch coulter of weak to strong glass scratches.   

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CHEMICAL SURFACE - DAMAGES

The following materials can cause burns, changes or turbidity of the glass surface:

MATERIALS

  • Strong alkaline facade cleaner 

  • Hydrofluoric acid and cleaning agents containing hydrofluoric acid

  • Cement mortar and concrete

  • Mineral dyes

  • Mineral plaster

  • Acidic environmental influences etc.

 

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