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ISO 3729:1976 Fibre building boards -- Determination of surface stability
standard by International Organization for Standardization, 12/01/1976
Applies to hard and medium grades as defined in ISO 818. The method specified is similar to that described in ISO 3546: Measurement of the air escaping from a measuring head placed on the surface of a test piece conditioned in a specified atmosphere, repetition of the measurement after conditioning in a second specified atmosphere, and then again after reconditioning in the first specified atmosphere.
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