ASTM D763-81(1995)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
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Designation: D 763 – 81 (Reapproved 1995)
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Specification for
Raw and Burnt Umber Pigments
This standard is issued under the fixed designation D 763; 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.
TABLE 1 Requirements for Composition of Raw and Burnt
1. Scope
Umber
1.1 This specification covers the pigments commercially
Raw Burnt
known as raw umber and burnt umber.
Umber Umber
Iron oxide (Fe O ), min, % 37 42
2 3
2. Referenced Documents
Calcium compounds (as CaO), max, % 5.0 5.0
2.1 ASTM Standards: Moisture and other volatile matter, max, % 5.0 5.0
Coarse particles (total residue retained on a No. 325 2.0 2.0
D 50 Test Methods for Chemical Analysis of Yellow, Or-
(45-μm) sieve), max, %
ange, Red, and Brown Pigments Containing Iron and
Organic colors, max, % none none
Manganese
D 185 Test Methods for Coarse Particles in Pigments,
Pastes, and Paints
container and shall break up readily in linseed oil to form a
D 280 Test Methods for Hygroscopic Moisture (and Other
smooth paint of brushing consistency. It shall mix readily in all
Matter Volatile Under the Test Conditions) in Pigments
proportions, without curdling, with linseed oil, turpentine, or
D 387 Test Method for Color and Strength of Color Pig-
volatile petroleum spirits, or any mixture of these substances.
ments with a Mechanical Muller
The paste shall conform to the following requirements:
D 1208 Test Methods for Common Properties of Certain
Pigment, min, % 55
Pigments
Nonvolatile vehicle, min, % 80
Moisture by distillation, max, % 2.0
Coarse particles and skins (total residue retained on a 1.0
3. Composition and Properties
No. 325 (45-μm sieve), max, % of dry pigment
3.1 Dry Pigments—The pigments shall conform to the
3.3 The mass color and character of the tint and the tinting
following requirements:
strength formed by a mixture with a white pigment shall be
3.1.1 Raw Umber—The pigment shall be in a soft, dry form
within mutually agreed upon limits of a standard acceptable to
and shall be a hydrated oxide of iron (together with such
both the purchaser and the seller.
manganese that is naturally associated with it) permeating a
siliceous base and shall be free of admixtures of other
4. Sampling
substances except carbon pigments. The pigment shall conform
4.1 Two samples shall be taken at random from different
to the requirements for composition prescribed in Table 1.
packages from each lot, batch, day’s pack, or other unit of
3.1.2 Burnt Umber—The pigment shall be produced by the
production in a shipment. When no markings di
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