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What do the designations of 30 Minute and 60 Minute building paper mean?

April 26, 2017building designations mean Minute paper

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What do the designations of 30 Minute and 60 Minute building paper mean?

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These designations refer to a moisture resistance test which uses a moisture sensitive dye as an indicator. This is an American test and is not officially recognized in Canada. HAL INDUSTRIES is the only Canadian manufacturer of building paper to rate our building papers according to this test.