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NBN ISO 11528:2021
Buildings and civil engineering works — Sealants — Determination of crazing and cracking following exposure to artificial or natural weathering
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Summary
This International Standard specifies methods for the assessment of surface defects (crazing and
cracking) on sealants after exposure to artificial or natural weathering.
NOTE Sealants are weathered in the laboratory in order to simulate ageing processes occurring during
natural weathering. Generally, valid correlations between ageing during artificial and natural weathering cannot
be expected because of the large number of influencing factors. Certain relationships can only be expected if
the effect of the important parameters (spectral distribution of the irradiance in their photochemically relevant
range, temperature of the specimen, type of wetting, wetting cycle relative humidity) on the sealant is known.
However, unlike natural weathering, testing in the laboratory is carried out taking into consideration a limited
number of variables which can be controlled, and therefore, the results are more reproducible.
cracking) on sealants after exposure to artificial or natural weathering.
NOTE Sealants are weathered in the laboratory in order to simulate ageing processes occurring during
natural weathering. Generally, valid correlations between ageing during artificial and natural weathering cannot
be expected because of the large number of influencing factors. Certain relationships can only be expected if
the effect of the important parameters (spectral distribution of the irradiance in their photochemically relevant
range, temperature of the specimen, type of wetting, wetting cycle relative humidity) on the sealant is known.
However, unlike natural weathering, testing in the laboratory is carried out taking into consideration a limited
number of variables which can be controlled, and therefore, the results are more reproducible.
Technical characteristics
| Publisher | Bureau de Normalisation Belge (NBN) |
| Publication Date | 05/26/2021 |
| Page Count | 26 |
| EAN | --- |
| ISBN | --- |
| Weight (in grams) | --- |
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