ASTM D605-82(2003)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D 605 – 82 (Reapproved 2003)
Standard Specification for
Magnesium Silicate Pigment (Talc)
This standard is issued under the fixed designation D 605; 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 (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 3. Composition and Properties
1.1 This specification covers pigments that consist substan- 3.1 The pigment shall be made by grinding or otherwise
tiallyofnaturalhydrousmagnesiumsilicate,andisrestrictedto processing natural, hydrous magnesium silicate and shall
those minerals that conform to the chemical limits prescribed conform to the following requirements:
herein and can be suitably processed to what is commercially
Weight %
min max
known as paint pigment quality.
Combined magnesium and calcium sili- 88 .
1.2 The values stated in SI units are to be regarded as the
cates (MgO plus SiO plus CaO)
standard. The values given in parentheses are for information
Calcium oxide (CaO) . 10
Aluminum and iron oxides (R O ) . 6
2 3
only.
Loss on ignition . 7
1.3 The following hazard caveat applies to the test method
Moisture and other volatile material . 1
portion of this specification only. This standard does not
3.2 Color—The color shall be equal, within agreed upon
purport to address all of the safety concerns, if any, associated
tolerances, to that of a reference sample agreed upon between
with its use. It is the responsibility of the user of this standard
the purchaser and the seller.
to establish appropriate safety and health practices and
3.3 Coarse Particles—The pigment shall contain no more
determine the applicability of regulatory limitations prior to
than 2 % of coarse particles, retained on a 45-µm (No. 325)
use.
sieve except as may be agreed upon between the purchaser and
the seller.
2. Referenced Documents
3.4 Water-Soluble Matter—The pigment shall contain no
2.1 ASTM Standards:
more than 1 % water-soluble matter except as may be agreed
D 280 Test Methods for Hygroscopic Moisture (and Other
upon between the purchaser and the seller.
Matter Volatile Under the Test Conditions) in Pigments
3.5 Oil Absorption—The oil absorption shall be equal,
D 281 Test Method for Oil Absorption of Pigments by
within agreed upon tolerances, to that of a reference sample
Spatula Rub-out
agreed upon between the purchaser and the seller.
D 562 Test Method for Consistency of Paints Measuring
3.6 Consistency—When consistency is included in the pur-
Krebs Unit (KU) Viscosity Using a Stormer-Type Viscom-
3 chaser’s specification, it shall be equal, within agreed upon
eter
tolerances, to that of a reference sample agreed upon between
D 717 Test Methods for Analysis of Magnesium Silicate
2 the purchaser and the seller.
Pigment
3.7 Fineness—The paint fineness shall be equal, within
D 1208 Test Methods for Common Properties of Certain
2 agreed upon tolerances, to that of a reference sample agreed
Pigments
upon between the purchaser and the seller.
D 1210 TestMethodforFinenessofDispersionofPigment-
Vehicle Systems by Hegman-Type Gage
4. Sampling
4.1 Two samples shall be taken at random from different
1 packages from each lot, batch, day’s pack, or other unit of
This specification is under
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