Standard Test Methods for Tensile Properties of Thin Plastic Sheeting
|Publication Date:||28 August 1981|
|ICS Code (Films and sheets):||83.140.10|
These methods cover the determination of tensile properties of plastics in the form of thin sheeting, including mm (less than 1.0 mm (0.04 in.) in thickness).
NOTE 1-Film has been arbitrarily defined as sheeting having nominal thickness not 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 Method D 638.
Two types of tension tests are described in these methods, differing basically only in manner of load application. These methods may be used to test all plastics within the thickness range described and the capacity of the machine employed.
Method A. Static Weighing-ConstantRat
Method B. Pendulum Weighing-Constant- Rate-of-Power-Grip Motion Test-This method employs a constant rate of motion of one grip and a variable rate of motion of the second grip. The variable-rate grip is attached to a pendulum weighing head, and its movement is dependent on the load-deformation behavior of the material under test.
Specimen extension may be measured in these methods by grip separation, extension indicators, or displacement of gage marks.
A procedure for determining the tensile modulus of elasticity is included, using Method A at one strain rate.
The values stated in SI units are to be regarded as the standard.
NOTE 3-This modulus determination procedure is based on the use of grip separation as a measure of extension; however, the desirability of using extension indicators accurate to ± 1.0 % or better as specified in Method D 638 is recognized, and provision for the use of such instrumentation is incorporated in the procedure.