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D4838-88 – Standard Test Method Technical Guide
🎯 Scope and Application of ASTM D4838
ASTM D4838-88 (Reapproved 2016) establishes a standardized test method for determining the relative absorption tinting strength of chromatic paints. This standard is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings. The procedure is strictly designed for comparing a test paint against a reference paint of the same chemical type, and it relies on dilution of the paints with a standard mixing white paint followed by instrumental measurement. Provision is made for correcting the results for small differences in hue or chroma between the test and reference chromatic paints.
⚠ Critical Applicability Constraint: Per Section 1.2, this test method is intended strictly for paints containing the same type of vehicle (acrylic, alkyd, or oil) and utilizing single-pigment colorants of the same Colour Index name and number. Paints with mixed pigments or different binders are not considered suitable for this specific method.
💡 Practical Advantage: As stated in the scope, the exact amounts of the pigment and the other components of the paint do not need to be known for the successful execution of the test. This makes the method highly practical for comparative quality control testing of proprietary formulations without requiring full compositional disclosure.
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