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Standard: |
NWSP |
Method: |
NWSP 110.4 |
Title: |
Breaking Force and Elongation of Nonwoven Materials (Strip Method) |
The NWSP 110.4 Strip Tensile properties test method covers cut strip test procedures for determining the breaking force and elongation of most nonwoven materials. This method outlines procedures for both dry and wet testing.
This test method describes two procedures, Option A – IST 110.4 -02 and Option B – ERT 20.2 – 89, for carrying out nonwoven material tensile tests. These two procedures use two types of specimens which are listed below and three alternative types of testing machines are also listed below. CRE is the instrument of choice.
Types of specimen
a) Option A – 25 mm strip tensile
b) Option B – 50 mm strip tensile
Style of tensile testing machine
a) Constant-rate-of-extension (CRE)
b) Constant-rate-of-load (CRL)
c) Constant-rate-of-traverse (CRT)
SI values are regarded as the official standard system of measurement for this standard test method. If other systems of measurement are used in place of SI units (including inch-pound) their values must be reported independently. Systems of measurement must not be combined in any way, but shall be regarded and reported separately.
A test specimen is clamped in a tensile testing machine and a force applied to the specimen until it breaks. Values for the breaking force and elongation of the test specimen are obtained from machine scales, dials, autographic recording charts, or a computer interface.
The strip test method is considered satisfactory for acceptance testing of commercial shipments of most nonwoven materials.
This procedure is applicable for testing nonwoven materials in either a dry conditioned or wet state.
Comparison of results from tensile testing machines operating on different principles is not recommended. When different types of machines are used for comparison testing, constant time-to-break at 20 ± 3 seconds is the established way of producing data. Even then the data may differ significantly. The constant-rate-of-extension tensile testing machine is preferred for this method.
Customer needs to specify which option to use.
Please note:
SGS-IPS cannot sell or otherwise provide standards, specifications, or test procedures to third parties.