pH value is to test the acid and alkali contents remained in apparel fabrics. Apparel fabrics which can directly contact with the skin has a relatively higher requirement on PH value. PH value will not make the skin itchy if controlled between weak acid or neutrality.

Fabric suppliers should emphasize the treatment on printing and dyeing process to avoid the excessive PH value. Export-oriented textile and garment companies should focus on the product quality during the production and strictly control the fabric inspection to ensure the garment quality to reach the requirement of security, sanitation and environmental protection.

Testing Labs such as Intertek, SGS, STR, CTL can test for PH Value.

pH of the Water-Extract from Web Processed Textiles

Developed in 1954 by AATCC Committee RA34

Purpose and Scope (Here is just a summary)

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 then accurately measured by a pH meter.

Here is the test method of pH test AATCC 81-2006 as below:

- Use 10 g specimen, cut into small pieces. Then Boil 250 ml distilled water for 10 minutes, immerse the specimen, cover the beaker with a watch glass and boil for an additional 10 minutes. Allow the covered beaker and contents to cool down to room temperature.

Finally determine the pH of the extract using a pH meter.

Note: Check with AATCC or testing lab for the most current and accurate details of the testing and procedures. 

Learn more about apparel quality testing, testing methods, and testing labs.

You may also have interest in the Fashion Newspaper article regarding textile testing at Apparel Testing and Textile Testing : Intertek.

I am not certain, but I think that the pH value test for apparel and fabrics may be pH value (AATCC 81 – 2006).  I had seen this on a testing report.  However, I could not today find this AATCC test method listed on the AATCC website.