AATCC 6-2016 Colorfastness to Acids and Alkalis.
1.1 Test specimens are evaluated for change in color when spot tested with acid, or steeped in alkali fumes, in a labo- ratory setting. These test methods are ap- plicable to textiles made from all fibers in the form of yarns or fabrics, whether dyed, printed or otherwise colored.
2. Principle
2.1 Test specimens are steeped in, or spotted with, the required solutions by means of simple laboratory equipment, allowed to dry at room temperature, then examined for change in color.
3. Terminology
3.1 colorfastness, n.—the resistance of a material to change in any of its color characteristics, to transfer of its colorant(s) to adjacent materials, or both, as a result of the exposure of the material to any environment that might be encountered during the processing, testing, stor- age or use of the material.
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.
4.2 All chemicals should be handled with care. Use chemical goggles or face shield, impervious gloves and an imper- vious apron during dispensing and mixing of hydrochloric acid, acetic acid and ammonium hydroxide.
4.3 An eyewash/safety shower should be located nearby and a selfcontained breathing apparatus should be readily available for emergency use.
5. Apparatus, Materials and Reagents
5.1 Beaker, 250 mL.
5.2 Bell jar, 4 L, with a glass plate base.
5.3 Evaporating dish.
5.4 Gray Scale for Color Change (AATCC Evaluation Procedure 1) (see 11.1).
5.5 Hydrochloric acid (HCl), 35%.
5.6 Acetic acid (CH 3 COOH), 56%.
5.7 Ammonium hydroxide (NH 4 OH), anhydrous ammonia 28% (NH 3 ).
5.8 Sodium carbonate (Na 2 CO 3 ), anhydrous, technical.
5.9 Calcium hydroxide [Ca(OH) 2 ], freshly prepared paste.
6. Test Specimens
6.1 Specimens of any convenient size may be used.
7. Procedure
7.1 Acid Tests.
7.1.1 Spot a test specimen with a solu- tion of hydrochloric acid (100 mL of 35% acid made up to 1 L, add acid to water) at 21°C (70°F), and then dry the specimen at room temperature without rinsing.
7.1.2 Spot a test specimen with acetic acid (56%) and dry it at room temperature without rinsing.
7.2 Alkali Tests.
7.2.1 Steep a test specimen in ammo- nium hydroxide (28% anhydrous ammonia) at 21°C (70°F) for 2 min and dry it at room temperature without rinsing.
7.2.2 Steep a test specimen in a 10% solution of sodium carbonate at 21°C.AATCC 6 pdf download.