Standard Test Methods for
Ashing Cellulose1

This standard is issued under the fixed designation D 3516; 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.

1. Scope

1.1 These test methods cover four ashing methods for
cellulose. These are intended for use on unbleached and
bleached cellulose in sheeted or bulk fiber form. Each one of
the test methods has advantages, so preference applications exist for all four.

1.2 The test methods appear as follows:
Sections
Test Method A—Ash in Cellulose at 575°C
6 to 11
Test Method B—Sulfated Ash in Cellulose at 575°C 12 to 17
Test Method C—Ashing Cellulose by Schoniger Oxidation 18 to 22
Test Method D—Wet Ashing of Cellulose for Inorganics 23 to 29

1.3 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
only.

1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For a specific
hazard statement, see 20.6.1.

2. Referenced Documents

2.1 ASTM Standards:
D 1193 Specification for Reagent Water2
D 1348 Test Methods for Moisture in Cellulose3

3. Summary of Test Methods

3.1 Test Method A, Ash in Cellulose at 575°C—This test
method measures the ash content of cellulose, which is defined
for this test as the residue remaining after ignition at 575 6
25°C until all carbon has been burned off. It is the simplest of
the four test methods for the determination of ash content only,
and it should not be considered as a standard preparative
procedure for elemental analysis.
NOTE 1—The ash content at this ignition temperature is a reasonable
measure of the mineral salts and inorganic foreign matter in the cellulose.
The weight of ash obtained varies with the temperature of ignition. Higher

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