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2019-03-07

2018-05-02

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Permitted values for insulating glass

Table of permitted values for insulating and float glass

Zone Permitted values with respect to one unit
F Flat damages of external edges, the so-called ‘shells’ with no impact on glass durability and not exceeding the breadth of the glass edge connection area.
‘shells’ on the pane surface without loose dents, filled with sealing compound.
Remains in the form of spots, stains or scratches.
R Inclusions, seeds, spots, stains, etc.
pane surfacev ≤1 m2 max 4 pcs à ≤ 3 mm ø
pane surface > 1 m2 max 1 piece à ≤ 3 mm ø per each meter of the edge length;
Remains (dots) in the interlayer:
pane surface ≤ 1 m2 max 4 pcs à ≤ 3 mm ø
pane surface > 1 m2 max 1 piece à ≤ 3 mm ø per each meter of the edge length;
Remains (stains) in the interlayer : whitish, greyish or transparent - max 1 piece ≤ 3 cm2
Scratches: the sum of single lengths: max 90 mm – single length: max 15 mm
Scratches not thicker than a human hair: not permitted in greater numbers
H Inclusions, seeds, spots, stains, etc.
pane surface ≤ 1 m2 max 2 pcs à ≤ 2 mm ø
1 m2 > pane surface ≤ 2 m2 max 3 pcs à ≤ 2 mm ø
pane surface > 2 m2 max 5 pcs à ≤ 2 mm
Scratches: the sum of single lengths: max 45 mm – single length: max 15 mm
Scratches not thicker than a human hair: not permitted in greater numbers
R+H Max number as in Zone R
Inclusions, seeds, spots, stains, etc. from 0.5 < 1.0 mm are permitted without area limitation, concentrations in one place not permitted though.
Concentration in one place: min. 4 inclusions, seeds, spots, stains, etc. per circle with a diameter of ≤ 20 cm.
  Quality flaws ≤ 0.5 mm shall not be considered. Disturbance fields (aureole) may not be larger than 3 mm.

Insulating glass:
1. In the case of insulating glass the permitted values quoted above are increased by 50% for each insulating glass pane.
2. Resinous float glass may have a corrugated surface attributable to the nature of its manufacturing process.

Single security glass:
1. Local glass surface corrugation may not exceed 0.3 mm with respect to the length of 300 mm.
2. In the case of single security float glass with a nominal thickness from 6 mm to 15 mm, its bulging with respect to the length of the glass edge may not exceed 3 mm per 1,000 mm of the edge length.
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