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ANNEX A (Normative) UV RESISTANCE TEST A – 1 To determine the effect of UV radiation and weathering on the breaking strength, the HDPE/PP Woven fabrics shall be exposed as given in A - 2 and A – 3. A – 2 TEST PROCEDURE The test shall be carried out with fluorescent UV – Lamp type B (313 nm or its equivalent). The duration of the test shall be 192h (that is eight days) in continuous mode. The test cycle shall be: 8h at 60± 3 ̊C with UV – radiation alternating with 4h at 50 ± 3 ̊C condensation. Irradiance level throughout the test shall be maintained at 0.63 (+0.04/ -0) W/m2. A – 3 TEST PROCEDURE A – 3.1 Determine the original average breaking strength of fabric as per test method specified in IS 1969 (part 1) A – 3.2 Expose the specimens alternately to ultraviolet light and condensation in respective test cycle in continuous mode for total 192h. The type of fluorescent UV lamp, the timing of the UV and condensation exposure and the temperature of the UV exposure and condensation shall be specified in A-2. A – 3.3 Determine the average breaking strength of the fabric separately after UV exposure as mentioned above. A – 3.4 Determine the percent retention of original strength as follows: Percentage retention of original breaking strength = 𝑎 𝑥 100 𝑏 Where a) a= average breaking strength before UV exposure as obtained in A – 3.1 b) b= average breaking strength after UV exposure as obtained in A – 3.3 NOTES 1. The UV source is an array of fluorescent lamps (with lamp emission concentrated in the UV range). 2. Condensation is produced by exposing the test surface to a heated, saturated mixture of air and water vapour, while the reverse side of the test specimen is exposed to the cooling influence of ambient room air. 8PDF Image | High Density Polyethylene HDPE Polypropylene PP Woven Sacks
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