Glass- knowledge

Codeletter for attack-resistant glass (DIN 52290): A = thrown projectiles resistant (A1,A2,A3);

was through DIN EN 356 replaced with labelling P1A to P5A.

See below Attack-resistant glazing or Attack-resistant glass.

a - Value

Indicates, how many cubic metres of air transmit between inside and outside area per each metre of jointing length during an hour per each existing air-pressure difference of 10Pa.
(DIN 18055, Issue:1981-10 Window; air permeability of joints, water tightness and mechanical strain; requirements and testing).

Absorption

Energy intake of matter

Acid-etching

see: Etching

Adhesion

Gripping of two diffent materials.

Adjusted edge

see: Edge processing

Air-conditioning stones

See: Ventilation stones.

Anisotropy

Optical effect of toughened safety glass (ESG). The tension zones occured with toughened safety glass can lead to double break of light that could be seen observable when coloury ring appears. Anistropies are easy to recognize under polarised light or between two polarising filters. It is not unfavourable fault.

Antique glass

Kind of glass with irregular surface (contains schlieren and bubbles).

Antireflective glass

Flat glass whose coatings minimize normal reflexes.

APTK

Abbr. from the field of sealing compounds: ethylene-propylene-terpolymer rubber (old abbreviation for EPDM - ethylene propylene diene Monomer rubber)

Argon

Inert gas, drawn on to improve k-value by multiplate insulation glass (MIG) as gas filling.

Attack-resistant glass

Laminated safety glas, with multi-layer films resp. glass composition, providing a certain resistance against a violent impact. Attack-resistant glazing, see DIN EN 356, DIN EN 1063 and DIN 52290:- thrown projectiles-resistant: code letter P1A to P5A /DIN EN 356)- smashing-resistant : code letter P6B to P7B (DIN EN 356)- gunshots-resistant : code letter BR1 bis BR7 (DIN EN 1063)- detonation-resistant: code letter D (DIN 52290 part 5; still valid at the moment)