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Some smooth surface modified bitumens are coated at the factory with sand that is not adhered to the membrane. What is its purpose?

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Some smooth surface modified bitumens are coated at the factory with sand that is not adhered to the membrane. What is its purpose?

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The sand is a “release agent” to prevent against the roll sticking together while it is rolled up. This is sometimes called “blocking”. It’s the same reason EPDM has mica or other dusting agents on the membrane.

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