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Analytical Chemistry

Cosmetics
  • Determination of thioglycolic acid and pH in hair waving products

    Responsible institute Bureau of Cosmetics and Hazardous Substances
    Type of participating laboratory Government and private laboratory
    Availability for participating laboratory 20 laboratories
    Type of test item Hair waving products
    Amount of test item/cycle 1 sample
    Tested property or measured quantities • Thioglycolic acid
    • pH
    Testing method Routine method of participant
    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 consensus value
    Statistical design Robust statistics
    Acceptable range z-score,⎪Z ⎪≤ 2
    Time for registration to PTS November – December
    Frequency of operation 1 time / year
    Annual member fee 2,000 Baht
    Scheme coordinator Ms Junya Meesri
    Telephone number 0 2951 0000 ext. 99924
    e-mail address coshaz@dmsc.mail.go.th
    Website
    Application
    Manual
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