ASTM D882 Standard Test Method for Tensile Properties of Thin Plastic Sheeting
ASTM D882 is a standard test method for determining the tensile properties of thin plastic films with a thickness of less than 1.0 mm (0.04 in) and is of great importance in the film packaging industry, both for quality control and research and development.
Note 1—Film is defined in Terminology D883 as an optional term for sheeting having a nominal thickness no greater than 0.25 mm (0.010 in.).
Note 2—Tensile properties of plastics 1.0 mm (0.04 in.) or greater in thickness shall be determined according to Test Method D638.
Characteristic values
Tensile strength: is calculated by dividing the maximum force by the original cross-section of the specimen. The result is expressed in force per unit area.
Tensile strength at break: is calculated in the same way as the tensile strength, but using the force at break instead of the maximum force.
Point of break: stress and strain at the moment of specimen break.
Yield point: stress and strain at the curve plot point at which the gradient is zero.
Modulus of elasticity: is an index for the stiffness of thin plastic films.
Tensile energy to break.
Breaking factor: is calculated by dividing the maximum force by the original width of the specimen (kN/m).
Specimen
The test specimens shall consist of strips of uniform width and thickness at least 50mm(2 in.) longer than the grip separation used. The nominal width of the specimens shall be not less than 5.0mm(0.20in.) or greater than 25.4mm(1.0in.).
A width-thickness ratio of at least eight shall be used. Narrow specimens magnify effects of edge strains or flaws,or both.
The utmost care shall be exercised in cutting specimens to prevent nicks and tears that cause premature failures(see Note below). The edges shall be parallel to within 5% of the width over the length of the specimen between the grips.
Note: Microscopical examination of specimens can be used to detect flaws due to sample or specimen preparation.
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