Test methods are used for Phenolic Yellowing- 1. ISO 105-X18 2. M&S C20B 3. Tesco TM/137/01 4. Adidas Test Procedure 5.10 Test procedure- A standard test package consists of five test specimens and one control fabric - each separated by a glass plate - making a total of seven glass plates. Each package is wrapped in BHT-free polythene film. The packages are closed and sealed with ordinary adhesive tape. To ensure uniform contact between the test papers and the test specimens, the packages are placed in a Perspirometer. The pressure is standardised by the application of a weight. Place the persoirometer in incubator at a temperature of 50°C ± 3°C. The treatment time is 16 hours. At the end of the test, the Perspirometers are removed from the incubator, the test packages are taken out and are allowed to cool before unwrapping. The specimens are then compared with their originals, and the intensity of yellowing is assessed with a Grey Scale for Staining.

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