GB/T 35827-2018 English PDF (GBT35827-2018)

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GB/T 35827-2018: General methods on determination of cosmetics -- Identification of the emulsion type (w/o or o/w)
GB/T 35827-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.70
Y 42
General methods on determination of cosmetics -
Identification of the emulsion type (w/o or o/w)
ISSUED ON. FEBRUARY 06, 2018
IMPLEMENTED ON. SEPTEMBER 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Conductivity method ... 4 
3 Dilution method ... 4 
4 Dyeing method ... 5 
General methods on determination of cosmetics -
Identification of the emulsion type (w/o or o/w)
1 Scope
This standard specifies the methods for the identification of the emulsion type
(w/o or o/w) of cosmetics of cream and lotion type by conductivity method,
dilution method, dyeing method.
This standard applies to the qualitative identification of emulsion types (w/o or
o/w) of cosmetics of cream and lotion type.
2 Conductivity method
2.1 Principle
Oil-in-water (o/w) products are more conductive than water-in-oil (w/o).
2.2 Instrument
Conductivity meter.
2.3 Steps
2.3.1 Before testing, correct the instrument according to the requirements of the
instrument manual.
2.3.2 Select the appropriate range (>10 μS/cm). Insert the electrode into the
specimen. Observe whether it is conductive.
2.4 Determination of results
If the conductivity is displayed, it is oil-in-water type (o/w). Otherwise, it is water-
in-oil type (w/o).
3 Dilution method
3.1 Principle
Use the principle of similarity-intermiscibility of the emulsified external phase.
3.2 Reagents and materials