ASTM D4906-95

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Designation: D 4906 – 95
Standard Test Method for
Total Solids and Ash Content in Leather Finishing Materials
This standard is issued under the fixed designation D 4906; 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 5.1.3 If the weight loss in the 1-h drying period did not
change the total solids percentage more than 0.1 %, report the
1.1 This test method covers the total solids and ash content
results. If greater than 0.1 % loss was obtained from the last
of finishing materials.
1-h drying period, then repeat the drying until the change is
1.2 The values stated in SI units are to be regarded as the
less than 0.1 %.
standard.
5.2 Ash:
1.3 This standard does not purport to address all of the
5.2.1 Place each platinum dish, containing the residue from
safety concerns, if any, associated with its use. It is the
the total solids determination, in a muffle furnace at 600°C 6
responsibility of the user of this standard to establish appro-
25°C for 2 h.
priate safety and health practices and determine the applica-
5.2.2 If difficulty is encountered in completely burning off
bility of regulatory limitations prior to use.
the carbon, leach the residue with hot water (filtering through
2. Significance and Use
ashless filter paper) and further ignite this residue in the muffle
furnace.
2.1 This test method is intended for use in determining the
5.2.3 To the dish containing the cooled ash, add the filtrate;
total solids content and the ash content of a finishing material
evaporate to dryness and heat for 30 min at 600°C 6 25°C. The
before its use on any leather.
product shall then be cooled in a dessicator and weighed.
3. Apparatus
6. Calculation
3.1 Two Tared Platinum Dishes.
6.1 The percent total solids of the finishing material shall be
3.2 Drying Oven, that operates at 43°C 6 3°C and 93°C 6
calculated as follows:
3°C.
3.3 Desiccator, with calcium chloride or other desiccant. A
Total solids, percent 5 3 100 (1)
3.4 Muffle Furnace, capable of maintaining temperatures of B
(600°C 6 25°C).
where:
A 5 final weight of solid matter after drying, and
4. Sampling
B 5 the original weight of the sample.
4.1 One 5- g and one 10-g sample of the finishing material
6.2 The percent ash content of the finishing material shall be
shall be weighed with accuracy to within 0.001 g.
calculated as follows:
5. Procedure
C
Ash content, percent 5 3 100 (2)
B
5.1 Total Solids:
5.1.1 Place the samples, which have been weighed in
where:
platinum dishes, in the oven for 16 h at 43°C followed by 2 h
C 5 final weight of ash, and
at 93°C. (If two ovens at different tem
...