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Analytical Chemistry

  • Determination of thioglycolic acid and pH in hair perm products 

    Responsible institute Cosmetics Chemical testing laboratory
    Type of participating laboratory Government and private laboratory
    Availability for participating laboratory 20 laboratories
    Type of test item Hair perm products
    Amount of test item/cycle 1 sample
    Tested property or measured quantities • Thioglycolic acid
    • pH
    Testing method Routine method used by participating
    Standard series/guidelines ISO/IEC 17043
    Quality standard implementation Accredited
    Independent review /Organizer Bureau of Laboratory Accreditation, Department of Science Service, Ministry of Science and Technology
    Laboratory performance evaluation -
    Statistical design Robust statistics
    Acceptable range z-score or z' score
    Time for registration to PTS November – December
    Frequency of operation 1 time / year
    Annual member fee 2,000 Baht
    Scheme coordinator Ms. Junya Meesri Ms. Chompookarn Thianchawanon
    Telephone number 0 2951 0000 ext. 99924
    e-mail address coshaz@dmsc.mail.go.th