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AS 681.2-2008 pdf free download
AS 681.2-2008 pdf free download.Elastomeric seals Material requirements for pipe joint seals used in water and drainage applications Part 2: Thermoplastic elastomers.
5.5.3 Low temperature compression set at -10 °C
When determined by the method specified in Iso 815 at -10 °C, using the small type B test piece, and the (30 ± 3) mm recovery measurement, the compression set of seals used in drainage and sewerage applications shalt comply with the requirements given in table 2.
5.6 Accelerated ageing in air
Test pieces prepared for the determination of hardness according to 5.3 and for the determination of tensile strength and elongation at break (see 5.4) shall be aged in air by the normal oven method specified in ISO 18, for 7 days at 70 VC.
The changes in hardness, tensile strength and elongation at break shall comply with the requirements given in table 2.
5.7 Stress relaxation in compression.
The stress relaxation shall be determined at 23 °C by method A of ISO 3384:1999 using the small cylindrical test piece after applying mechanical and thermal conditioning. Measurements shall be taken after 3 h 1, 3 and 7 days for the 7 day test and after 3 h 1, 3, 7, 30 and 100 days for the 100 days test.
The best fit straight line shall be determined by regression analysis using a logarithmic time scale and the correlation coefficients derived from these analyses shall not be lower than 0,93 for the 7 day test and 083 for the 100 day test. The 7 and 100 days requirements in table 2 are those derived from this straight line.
For continuous measurement using an apparatus described in the first paragraph of 5.2 of ISO 3384:1999 the 7 days and 100 days requirements in table 2 are those derived from the measurements at 7 and 100 days.
The stress relaxation in compression shall ccxnply with the requirements given in table 2. The test temperature shall be maintained within the specified tolerance during the whole period of the test and verified by suitable recording equipment on a continuous basis. The 100 days test shall be considered as a type approval test.AS 681.2-2008 pdf free download.
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