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EC 2000 Technical Data - Gardner
The Gardner Colour scale as specified in ASTM D1544 is a single number,
one dimensional, colour scale for grading the colour of similarly coloured
liquids such as resins, varnishes, lacquers, drying oils, fatty acids, lecithin's,
sunflower oil and linseed oil.
The scale ranges from a pale yellow to a red in shade and is described in
terms of the values 1-18. To comply with specifications, a 10mm path
length must be used.
The light yellow Gardner colour numbers (1 to 8) are based on potassium
chloroplatinate solutions, numbers 9 to 18 on solutions of ferric chloride,
cobaltous chloride and hydrochloric acid.
Guaranteed Agreement with International Standards; for many product
types, a characteristic set of standards was agreed and adopted to aid
colour control and the communication of colour specifications worldwide;
the result is a selection of colour grading scales that have been adopted as
international industry standards.
The EComparators are fully equivalent to the appropriate Visual
International Standards and fully compliant with Automatic International
Standards detailed below:
EC 2000 Gardner (ASTM D1544, D6166, ISO 4630-2) because in section
“Significance and use” of ASTM D6166 section 4.1, “This test method
provides a more precise way of measuring Gardner Colour than described
in Test Method D1544.” In the Scope of ISO 4630-2 it states “The method
described provides a more precise way of measuring Gardner colour than
that described in ISO 4630-1”.
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