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This specification covers three types of pigments commercially known as zinc phosphate each of which may or may not be available in specific grades delineated by particle size or oil absorption. The following types of pigments are: Type I which is zinc phosphate, dihydrate predominant, Type II which is zinc phosphate, dihydrate tetrahydrate mixture, and Type III which is zinc phosphate, tetrahydrate predominant. Zinc phosphate functions as both a chemical and a pigment. As a pigment it is used in a variety of applications including that of corrosion inhibiting paints. The pigments shall be subjected to the following tests: specific gravity test, oil absorption test, Hegman grind test, coarse particles test, pH test, specific resistance test, moisture test, and loss on ignition test.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1.1 This specification covers three types of pigments commercially known as zinc phosphate each of which may or may not be available in specific grades delineated by particle size or oil absorption.
1.1.1 Type I—Zinc Phosphate, dihydrate predominant.
1.1.2 Type II—Zinc Phosphate, dihydrate tetrahydrate mixture.
1.1.3 Type III—Zinc Phosphate, tetrahydrate predominant.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D153 Test Methods for Specific Gravity of Pigments
D185 Test Methods for Coarse Particles in Pigments
D280 Test Methods for Hygroscopic Moisture (and Other Matter Volatile Under the Test Conditions) in Pigments
D281 Test Method for Oil Absorption of Pigments by Spatula Rub-out
D1193 Specification for Reagent Water
D1208 Test Methods for Common Properties of Certain Pigments
D1210 Test Method for Fineness of Dispersion of Pigment-Vehicle Systems by Hegman-Type Gage
D2448 Test Method for Water-Soluble Salts in Pigments by Measuring the Specific Resistance of the Leachate of the Pigment
ICS Number Code 83.040.30 (Auxiliary materials and additives for plastics); 87.060.10 (Pigments and extenders)
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ASTM D6280-98(2014), Standard Specification for Zinc Phosphate Pigments, ASTM International, West Conshohocken, PA, 2014, www.astm.orgBack to Top