ASTM D768-01(2012)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D768 −01 (Reapproved 2012)
Standard Specification for
Yellow Iron Oxide Hydrated
This standard is issued under the fixed designation D768; 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 3.2 Paste in Oil—The paste in oil shall be made by
thoroughly grinding the specified pigment with linseed oil
1.1 This specification covers the pigment commercially
(with or without a small amount of volatile thinner) together
known as yellow iron oxide, hydrated.
with (where necessary) small amounts of wetting or dispersing
1.2 The values stated in SI units are to be regarded as the
agents to a semipaste or fluid type consistency. As received, it
standard. The values given in parentheses are for information
shall not be caked in the container and shall break up readily in
only.
oil to form a smooth paint of brushing consistency. It shall mix
readily in all proportions, without curdling, with linseed oil,
2. Referenced Documents
turpentine, or volatile petroleum spirits, or any mixtures of
these substances. The paste shall conform to the following
2.1 ASTM Standards:
D50 Test Methods for ChemicalAnalysis ofYellow, Orange, requirements:
Red, and Brown Pigments Containing Iron and Manga-
Pigment, min, % 55
Nonvolatile vehicle, min, % of vehicle 80
nese
Moisture by distillation, max, % 2.0
D185 Test Methods for Coarse Particles in Pigments
Coarse particles and skins (total residue retained on a 1.0
D280 Test Methods for Hygroscopic Moisture (and Other
No. 325 (45-µm) sieve), max, percent of the dry
pigment
Matter Volatile Under the Test Conditions) in Pigments
Consistency by the Stormer viscometer:
D1208 Test Methods for Common Properties of Certain
A
At shearing rate of 100 revolutions/30 s, min, g 700
B
Pigments
At shearing rate of 100 revolutions/35 s, max, g 1200
A
Equivalent to a rating of 125 Krebs’ Units.
3. Composition and Properties
B
Equivalent to a rating of 145 Krebs’ Units.
3.1 The pigment shall be a manufactured yellow iron oxide
3.3 The mass color character of the tint and the tinting
obtained by chemical reaction. It shall be a soft, finely
strength formed by a mixture with a white pigment shall be
powdered pigment, free of admixtures of other substances and
within mutually agreed upon limits of a standard acceptable to
shall conform to the following requirements:
both the purchaser and the seller.
Total hydrated oxide of iron, min, % 93
A
Total oxide of iron, min, % 83
A 4. Sampling
Loss on ignition, max, % 13
Moisture and other volatile matter, max, % 1.0
4.1 Two samples shall be taken at random from different
Water soluble matter, max, % 0.50
packages from each lot, batch, day’s pack, or other unit of
Coarse particles (total residue retained on a No. 325 0.5
(45-µm) sieve), max, %
production in a shipment. When no markings distinguishing
Hydrogen ion concentration (pH value) 4.5 to 8.0
between units of production appear, samples shall be taken
from different packa
...