The ISO 5978 standard details the method for finding the blocking resistance of rubber-coated or plastics-coated fabrics or sheets. Blocking is the unintentional adhesion between two materials and can often occur between the sheets of plastics and rubbers on a roll. Properties of the material that are tested in this test are adhesive strength and the rating of the blocking which has three options that are defined in the ISO 5978 standard as No Blocking , Slight Blocking , and Blocking .

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