EN ISO 13438 - GEOTEXTILES AND GEOTEXTILE-RELATED PRODUCTS - SCREENING TEST METHOD FOR DETERMINING THE RESISTANCE TO OXIDATION


During their service life the nonwoven geotextiles are exposed to oxidation which leads, with time, to aging and degradation of polymers. This concerns in particular polypropylene and polyethylene goetextiles.

The resistance to oxidation is determined by an accelerated aging test and it provides a screening method to predict a durability of the geotextile of at least 25 years in normal conditions (natural soils with 4<ph<9 and soil temperature < 25 °C.

For polypropylene geotextiles the test procedure consists in exposing the specimens to an elevated temperature (110 °C) in a laboratory oven, for a time of either 14 or 28 days, according to the specific application of the geotextile.

At the end of the procedure the specimens are subjected to a tensile test: the values of tensile strength and elongation at break obtained are compared with those of the control sample.