ASTM D6280-98(2014)
(Specification)Standard Specification for Zinc Phosphate Pigments
Standard Specification for Zinc Phosphate Pigments
ABSTRACT
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.
SCOPE
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.
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Designation:D6280 −98 (Reapproved 2014)
Standard Specification for
1
Zinc Phosphate Pigments
This standard is issued under the fixed designation D6280; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Composition and Properties
1.1 This specification covers three types of pigments com- 4.1 Zinc phosphate pigment is a white corrosion inhibiting
mercially known as zinc phosphate each of which may or may pigment consisting either predominately of zinc phosphate
not be available in specific grades delineated by particle size or dihydrate (Zn (PO ) ·2H O) or a mixture of zinc phosphate
3 4 2 2
oil absorption. dihydrate and zinc phosphate tetrahydrate (Zn (PO ) ·4H O)
3 4 2 2
1.1.1 Type I—Zinc Phosphate, dihydrate predominant. or predominately of zinc phosphate tetrahydrate which is free
1.1.2 Type II—Zinc Phosphate, dihydrate tetrahydrate mix- from extenders, diluents, and other pigments.
ture.
4.2 Zinc phosphate shall be a chemically prepared pigment
1.1.3 Type III—Zinc Phosphate, tetrahydrate predominant.
and shall be of such type and grade as to conform to the
1.2 The values stated in SI units are to be regarded as requirements prescribed in Table 1. They shall additionally be
standard. No other units of measurement are included in this free of extenders, modifiers, diluents, alteration of stoichiomet-
standard. ric chemical structure, co-reacted precipitates, and carbona-
ceous material.
2. Referenced Documents
4.3 The desired properties of the pigment, other than as
2
2.1 ASTM Standards:
herein indicated, shall be subject to mutual agreement between
D153 Test Methods for Specific Gravity of Pigments
interested parties and shall be based upon a satisfactory match
D185 Test Methods for Coarse Particles in Pigments
between any submitted sample and a previously agreed upon
D280 Test Methods for Hygroscopic Moisture (and Other
reference sample.
Matter Volatile Under the Test Conditions) in Pigments
D281 Test Method for Oil Absorption of Pigments by
5. Classification
Spatula Rub-out
5.1 TypeI—which consists predominately of zinc phosphate
D1193 Specification for Reagent Water
dihydrate (Zn (PO ) ·2H O) and exhibits a differentiating loss
3 4 2 2
D1208 Test Methods for Common Properties of Certain
on ignition of the dried pigment at 600°C between 8.5 and 10.0
Pigments
weight %.
D1210 Test Method for Fineness of Dispersion of Pigment-
5.2 Type II—which consists essentially of a mixture of zinc
Vehicle Systems by Hegman-Type Gage
phosphate dihydrate (Zn (PO ) ·2H O) and Zinc Phosphate
D2448 Test Method for Water-Soluble Salts in Pigments by
3 4 2 2
Tetrahydrate (Zn (PO ) ·4H O) and exhibits a differentiating
Measuring the Specific Resistance of the Leachate of the
3 4 2 2
loss on ignition of the dried pigment at 600°C between 10.0
Pigment
and 14.0 weight %.
3. Significance and Use
5.3 Type III—which consists predominately of zinc phos-
3.1 Zinc phosphate functions as both a chemical and a
phate tetrahydrate (Zn (PO ) ·4H O) and exhibits a differenti-
3 4 2 2
pigment. As a pigment it is used in a variety of applications
ating loss on ignition of the dried pigment at 600°C between
including that of corrosion inhibiting paints.
14.0 and 18.0 weight %.
6. Sampling
1
This specification is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
6.1 Two samples shall be taken at random from different
Subcommittee D01.31 on Pigment Specifications.
packages from each lot, batch, days pack or other unit of
Current edition approved Dec. 1, 2014. Published December 2014. Originally
production in a shipment. When no markings distinguishing
approved in 1998. Last previous edition approved in 2008 as D6280 – 98 (2008).
DOI: 10.1520/D6280-98R14.
between units of production appear, samples shall be taken
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
from different packages in ratio of two samples for each 5000
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
kg, except for those shipments of less than 5000 kg where two
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. samples shall be taken.At the option of the interested party the
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D6280−98 (2014)
TABLE 1 Zinc Phosphate Pigment Properties
Property TYPE I TYPE II TYPE III
ZnO, weight percent 62.6 - 65.1 62.6 - 65.1 62.6 -
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D6280 − 98 (Reapproved 2008) D6280 − 98 (Reapproved 2014)
Standard Specification for
1
Zinc Phosphate Pigments
This standard is issued under the fixed designation D6280; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
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
2
2.1 ASTM Standards:
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
3. Significance and Use
3.1 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.
4. Composition and Properties
4.1 Zinc phosphate pigment is a white corrosion inhibiting pigment consisting either predominately of zinc phosphate dihydrate
(Zn (PO ) ·2H O) or a mixture of zinc phosphate dihydrate and zinc phosphate tetrahydrate (Zn (PO ) ·4H O) or predominately
3 4 2 2 3 4 2 2
of zinc phosphate tetrahydrate which is free from extenders, diluents, and other pigments.
4.2 Zinc phosphate shall be a chemically prepared pigment and shall be of such type and grade as to conform to the requirements
prescribed in Table 1. They shall additionally be free of extenders, modifiers, diluents, alteration of stoichiometric chemical
structure, co-reacted precipitates, and carbonaceous material.
4.3 The desired properties of the pigment, other than as herein indicated, shall be subject to mutual agreement between
interested parties and shall be based upon a satisfactory match between any submitted sample and a previously agreed upon
reference sample.
5. Classification
5.1 Type I—which consists predominately of zinc phosphate dihydrate (Zn (PO ) ·2H O) and exhibits a differentiating loss on
3 4 2 2
ignition of the dried pigment at 600°C between 8.5 and 10.0 weight %.
1
This specification is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.31 on Pigment Specifications.
Current edition approved Nov. 1, 2008Dec. 1, 2014. Published November 2008December 2014. Originally approved in 1998. Last previous edition approved in 20032008
as D6280 – 98 (2003).(2008). DOI: 10.1520/D6280-98R08.10.1520/D6280-98R14.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’sstandard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D6280 − 98 (2014)
TABLE 1 Zinc Phosphate Pigment Properties
Property TYPE I TYPE II TYPE III
ZnO, weight percent 62.6 - 65.1 62.6 - 65.1 62.6 - 65.1
(on ignited sample)
P O , weight percent 34.9 - 37.4 34.9 - 37.4 34.9 - 37.4
2 5
(on ignited sample)
Loss on ignition, weight 8.5 - 10.0 10.0 - 14.0 14.0 - 18.0
percent (of dried pigment)
GRADE GRADE GRADE
Mean Particle Size F M C F M C F M C
(microns) < 2.5 2.5-5.0 > 5.0 same same
Oil adsorption > 30 30 - 15 < 15 same same
Matter soluble in water, 6500 6500 6500
specific resistance,
(min. ohm - cm)
Moisture and other volatile 0.5 0.5 0.5
matter (105 - 110°C)
3
Specific gravity, g/cm 3.0 - 3.5 3.0 - 3.5 3.0 - 3.5
Hegman grind 6 min 6 m
...
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