AATCC 97-2020 Test Method for Extractable Content of Textiles

AATCC 97-2020 Test Method for Extractable Content of Textiles. 6. Sampling 6.1 Take one 10 g specimen from each sample. If the sample is a woven fabric, cut on the bias to minimize loose fibers or yarns. 6.2 For improved accuracy, test dupli- cate specimens from each sample. 7. Procedure 7.1 Specimen Preparation. Place the specimen in a tared weighing bottle being careful to fold the edges of the specimen to prevent the loss of any fiber or loose yarn. Dry to a constant weight (see AATCC TM20A, Test Method for Fiber Analysis: Quantitative) in a circulating air oven at 105-110°C (221-230°F). Cool the weighing bottle in a desiccator. Weigh the bottle and specimen to the nearest 0.1 mg (see 11.4). 7.2 Water Extraction. Remove the dried specimen from the bottle and place it in a beaker containing 200 mL of distilled or deionized water at 82 ± 3°C (180 ± 5°F). Cover the beaker with a watch glass. Maintain the temperature of the water at 82 ± 3°C (180 ± 5°F) for 2 h. Pour the solution and specimen into the sieve and rinse the specimen, washing with two successive 100 mL portions of distilled water at 82 ± 3°C (180 ± 5°F). Recover any loose fibers on the sieve and fold them into the specimen. Return the specimen to its bottle and dry it to a constant weight as specified in 7.1. Deter- mine the amount of water extractable matter as the difference in the specimen weights obtained in 7.1 and 7.2 using the equation in 8.1. 7.3 Enzyme Extraction. Remove the dried specimen from the water extraction procedure (see 7.2) from the bottle and place in a beaker containing 200 mL of a 2% bacterial amylase solution at 74 ± 3°C (165 ± 5°F) for 1 h. Pour the solution and specimen into a sieve and rinse the specimen by washing with 10 successive 100 mL portions of distilled water at 82 ± 3°C (180 ± 5°F). Recover any loose fi- bers on the sieve and fold them into the specimen. Return the specimen to its bottle and dry to a constant weight as specified in 7.1. Determine the amount of en- zyme extractable matter as the difference in the weights obtained in 7.2 and 7.3 using the equation in 8.1. 7.3.1 If an extraction thimble has not been exposed to hexanes, it is recommended that it...