Test Method for Extractable Content of Textiles

AATCC 97-2020 free download.Test Method for Extractable Content of Textiles.
Water Extraction. Remove the dried specimen from the bottle and place ii 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 waler 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 rnL 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. Determine the amount of water extractable matter as the diflh,rence in the specimen weights obtained in 7.1 and 7.2 using the equation in 8.1.
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 I 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 fibers 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 enzyme extractable matter as the difference in the weights obtained in 7.2 and 7.3 using the equation in 8.1.
Interlaboratory Study. A limited study was conducted in 2005 to estimate the precision of the Soxhlet and accelerated solvent extraction procedures and their relative bias. The study consisted of three laboratories, three fabrics and two operators per laboratory. The fabrics used included a l00°/ cotton bleached fabric, a 50/50 cottonlpolyester greige fabric and a 100% cotton greige fabric. An accelerated solvent extractor made by Dionex Corporation, Sunnyvale. California was used in the study. Two determinations were conducted by each operator for each combination of test procedure and fabric. Averages and standard deviations for total extractable content are shown in Table I. Based on the limited data set on which this precision and bias statements have been made, users are cautioned when making critical decisions.
Analysis. The analyses used in this precision and bias statement are based on an analysis of all fabrics within each extraction method. The decision to conduct the all-fabric analysis was made based on the small study size and the results of the single-material computations. Variance components reported here were estimated using ASTM D2904-97, Annex Al. Details on the data and analysis can be obtained by contacting the AATCC Technical Center. Precision is reported in terms of critical dillerences. (‘alculations outlined in ASTM D2906- 97 (2002) were used to compute the one- sided critical differences between two means for sample sizes.
Variance Components. Soxhlet Procedure. The variance components calculated for the Soxhlet procedure are reported in Table II. All metrics reported in this section are in units oP/o of total extracted con tent.
Critical Differences—Soxhiet Method. The 95% critical differences calculated for the Soxhlet method are shown in Table Ill.
The variance components for the accelerated solvent extraction procedure are reported in Table IV.
The subsequent 95% critical differences estimated for the accelerated solvent procedure are shown in Table V.
Bias. The amount of extractable matter on a textile material is dependent on the extraction procedure used. Therefore, it is not possible to determine abso lute bias of these test procedures against an absolute value.AATCC 97 pdf download.Test Method for Extractable Content of Textiles