Standard Test Methods for Tensile Testing of High-Performance Polyethylene Films

Importancia y uso:

5.1 The levels of tensile properties obtained when testing high performance polyethylene films are dependent on the age and history of the specimen and on the specific conditions used during the test. Among these conditions are rate of stretching, type of clamps, gauge length of specimen, temperature and humidity of the atmosphere, rate of airflow across the specimen, and temperature and moisture content of the specimen. Testing conditions accordingly are specified precisely to obtain reproducible test results on a specific sample.

5.2 Breaking force is used in engineering calculations when designing various types of products. When needed to compare intrinsic strength characteristics, films of different sizes or different types of film, breaking tenacity is very useful because, for a given type of film, breaking force is approximately proportional to linear density.

5.3 Elongation of film is taken into consideration in the design and engineering of reinforced products because of its effect on uniformity of the finished product and its dimensional stability during service.

5.4 The FASE is used to monitor changes in characteristics of the material during the various stages involved in the processing.

5.5 Modulus is a measure of the resistance of film to extension as a tensile force is applied. Although modulus may be determined at any specified force, initial modulus is the value most commonly used.

5.6 Work-to-break is dependent on the relationship of force to elongation. It is a measure of the ability of a textile structure to absorb mechanical energy. Toughness at break is work-to-break per unit mass.

5.7 Shape, size, and internal construction of the end-product can have appreciable effects on product performance. It is not possible, therefore, to evaluate the performance of an end product in terms of the reinforcing material alone.

5.8 If there are differences of practical significance between reported test results for two laboratories (or more), comparative tests shall be performed to determine if there is a statistical bias between them, using competent statistical assistance. As a minimum, test samples shall be used that are as homogeneous as possible, that are drawn from the material from which the disparate test results were obtained, and that are randomly assigned in equal numbers to each laboratory for testing. Other materials with established test values may be used for this purpose. The test results from the two laboratories shall be compared using a statistical test for unpaired data, at a probability level chosen prior to the testing series. If a bias is found, either its cause must be found and corrected, or future test results must be adjusted in consideration of the known bias.

Subcomité:

D13.19

Referida por:

D1776_D1776M-20R24

Volúmen:

07.02

Número ICS:

83.180 (Adhesives)

Palabras clave:

; film; linear density; high performance polyethylene; tensile properties/tests;