Active Standard ASTM D7238 | Developed by Subcommittee: D35.02
Book of Standards Volume: 04.13
Historical (view previous versions of standard)
Significance and Use
5.1 The use of this apparatus is intended to induce property changes associated with the end use conditions, including the effects of the UV portion of sunlight, moisture, and heat. Exposures are not intended to simulate the deterioration caused by localized weather phenomena, such as atmospheric pollution, biological attack, and saltwater exposure.
5.3 Test data for one thickness of a geomembrane can not be used as data for other thickness geomembranes made with the same formula (polymer, pigment and stabilizers) since the degradation is thickness related.
1.3 This method covers the conditions under which the exposure is to be performed and the test methods for evaluating the effects of fluorescent UV, heat and moisture in the form of condensation on geomembranes. General guidance is given in Practices G151 and G154.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D1238 Test Method for Melt Flow Rates of Thermoplastics by Extrusion Plastometer
D5885 Test Method for Oxidative Induction Time of Polyolefin Geosynthetics by High-Pressure Differential Scanning Calorimetry
D6693 Test Method for Determining Tensile Properties of Nonreinforced Polyethylene and Nonreinforced Flexible Polypropylene Geomembranes
G113 Terminology Relating to Natural and Artificial Weathering Tests of Nonmetallic Materials
G151 Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that Use Laboratory Light Sources
G154 Practice for Operating Fluorescent Light Apparatus for UV Exposure of Nonmetallic Materials
G156 Practice for Selecting and Characterizing Weathering Reference Materials
ICS Number Code 59.080.70 (Geotextiles)