ASTM D763-06(2019)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:D763 −06 (Reapproved 2019)
Standard Specification for
Raw and Burnt Umber Pigments
This standard is issued under the fixed designation D763; 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 substancesexceptcarbonpigments.Thepigmentshallconform
to the requirements for composition prescribed in Table 1.
1.1 This specification covers the pigments commercially
3.1.2 Burnt Umber—The pigment shall be produced by the
known as raw umber and burnt umber.
calcination of raw umber and shall be free of admixtures of
1.2 The values stated in SI units are to be regarded as the
other substances except carbon pigments. The pigment shall
standard. The values given in parentheses are for information
conform to the requirements for composition prescribed in
only.
Table 1.
1.3 This international standard was developed in accor-
3.2 PasteinOil—Forbothrawandburntumber,thepastein
dance with internationally recognized principles on standard-
oil shall be made by thoroughly grinding the pigment with
ization established in the Decision on Principles for the
linseed oil (with or without a small amount of volatile thinner)
Development of International Standards, Guides and Recom-
together with (where necessary) small amounts of wetting or
mendations issued by the World Trade Organization Technical
dispersing agents to produce a paste or semipaste of satisfac-
Barriers to Trade (TBT) Committee.
tory consistency. As received, it shall not be caked in the
container and shall break up readily in linseed oil to form a
2. Referenced Documents
smooth paint of brushing consistency. It shall mix readily in all
2.1 ASTM Standards:
proportions, without curdling, with linseed oil, turpentine, or
D50 Test Methods for ChemicalAnalysis ofYellow, Orange,
volatile petroleum spirits, or any mixture of these substances.
Red, and Brown Pigments Containing Iron and Manga-
The paste shall conform to the following requirements:
nese
Pigment, min, % 55
D185 Test Methods for Coarse Particles in Pigments
Nonvolatile vehicle, min, % 80
Moisture by distillation, max, % 2.0
D280 Test Methods for Hygroscopic Moisture (and Other
Coarse particles and skins (total residue retained on a 1.0
Matter Volatile Under the Test Conditions) in Pigments
No. 325 (45-µm sieve), max, % of dry pigment
D387 Test Method for Color and Strength of Chromatic
3.3 The mass color and character of the tint and the tinting
Pigments with a Mechanical Muller
strength formed by a mixture with a white pigment shall be
D1208 Test Methods for Common Properties of Certain
within mutually agreed upon limits of a standard acceptable to
Pigments
both the purchaser and the seller.
3. Composition and Properties
4. Sampling
3.1 Dry Pigments—The pigments shall conform to the
4.1 Two samples shall be taken at random from different
following requirements:
packages from each lot, batch, day’s pack, or other unit of
3.1.1 Raw Umber—The pigment shall be in a soft, dry form
production in a shipment. When no markings distinguishing
and shall be a hydrated oxide of iron (together with such
between units of production appear, samples shall be taken
manganese that is naturally associated with it) permeating a
fro
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