Blocking is unwanted adhesion and develops in film processing and storage when layers of smooth film are in intimate contact with nearly complete exclusion of air. Temperature, or pressure, or both, can induce or change the degree of adhesion of the surfaces.
By this procedure, the film-to-film adhesion, expressed as a blocking load in grams, will cause two layers of film with an area of contact of 100 cm2 to separate. The test method is limited to a maximum load of 200 g.
NOTE 1: This test method is similar to ISO 11502 Method B, but is not technically equivalent.
Our company, TensoMax, designs, develops, manufactures, markets, and services universal testing machines including software, grips, fixtures and other accessories used to evaluate the mechanical properties of products, materials and components. Our tensile/universal testing machine are used in research and development, and quality control (QC) applications to test the strength, elasticity, durability and properties of materials including final products, packaging, metals, adhesives, plastics, wood, textiles, composites, ceramics and rubber.
Typical measurements include which can be done by our testing machines: • Fracturability / Brittleness • Compressive Strength / Hardness / Firmness • Rupture Force • Toughness • Elongation • Stress Relaxation behaviour • Yield Strength • Breaking Strength • Stickiness / Adhesiveness • Coefficient of Sliding Friction • Actuation Force • Tensile Strength • Peel Strength • Crush Resistance • Puncture/Burst strength • Abrasion • Seal Strength •