AATCC 43:2004 pdf download.Wetting Agents for Mercerization
4. Safety Precautions
NOTE: These safety precautions are for information purposes only. The pre- cautions are ancillary to the testing proce- dures and are not intended to be all inclu- sive. It is the user’s responsibility to use safe and proper techniques in handling materials in this test method. Manufac- turers MUST be consulted for specific details such as material safety data sheets and other manufacturer’s recommenda- tions. 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 mix- ing of sodium hydroxide.
4.3 An eyewash/safety shower should be located nearby and a self-contained breathing apparatus should be readily available for emergency use.
6.1 Into each of three 250 mL beakers measure out 100 mL of the mercerizing caustic soda solution at 26 ± 3°C (78 ± 5°F). Pipette into one beaker 0.75 mL, into the next 1.00 mL and into the third beaker 1.25 mL of the mercerizing pene- trant using a suitable small pipette. Mer- cerizing wetting agents all seem to be liq- uids. Stir the contents of each beaker until the penetrant is completely dis- solved in the caustic soda. These solu- tions are allowed to stand until all air bubbles have risen to the surface. It should be particularly noticed if the pene- trant remains well dispersed or dissolved because the separation of an immiscible layer on the surface would entirely vitiate the results and give false values.
6.2 From the greige (unboiled), 40/2, combed peeler cotton yarn, cut a bundle of 120 parallel ends, 25 mm (1 in.) in length. This bundle of yarn ends is dropped carefully onto the surface of one of the caustic solutions of penetrant, and the time required for complete wetting of all the ends is noted with a stopwatch. The average of five determinations is taken as the sinking time for that concentration.AATCC 43 pdf download.