AATCC 81:2016 pdf download.pH of the Water-Extract from Wet Processed Textiles
1. Purpose and Scope
1.1 This test method determines the pH of wet processed textiles.
1.2 To make a quantitative determination, the chemicals which influence pH must be removed from the textile specimen, collected as a water extract and then accurately measured by a pH meter.
2. Principle
2.1 The specimen is boiled in distilled or deionized water. The water-extract is cooled to room temperature and the pH is determined.
3. Terminology
3.1 bleaching, n.—elimination of unwanted coloring matter from a textile substrate by oxidative or reductive chemical treatment.
3.2 pH, n.—the negative logarithm of the etiective hydrogen ion concentration or hydrogen ion activity in gram equivalents per liter used in expressing both acidity and alkalinity on a scale whose values run from 0-14 with 7 representing neutrality, numbers less than 7 increasing acidity and numbers greater than 7 increasing alkalinity.
3.3 wet processing, n.—in textile manufacturing, a collective term for processes included in preparation, dyeing, printing and finishing in which the textile material is treated with a liquid. normally water, or with chemicals in solution or dispersion in a liquid.
4. Safety Precautions
NOTE: These safety precautions are for information purposes only. The precautions are ancillary to the testing procedures and are not intended to be all inclusive. It is the user’s responsibility to use safe and proper techniques in handling materials in this test method. Manufacturers MUST be consulted for specific details such as material safety data sheets and other manufacturer’s recommendations. All OSHA standards and rules must also be consulted and followed.
4.1 Good laboratory practices should be followed. Wear safety glasses in all laboratory areas.
9. Procedure
9.1 Boil 250 mL of distilled water at a moderate rate for 10 min. Immerse the specimen, cover the beaker with a watch glass and boil for an additional 10 min.
9.2 Allow the covered beaker and con-tents to cool to room temperature. Remove the specimen with tweezers, allowing the excess liquid to drip back into the extract.
9.3 Determine the pH of the extract using a pH meter operated according to manufacturer' s instructions.AATCC 81 pdf download.