ASTM D4906-95(2006)

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Designation:D4906–95 (Reapproved 2006)
Standard Test Method for
Total Solids and Ash Content in Leather Finishing Materials
This standard is issued under the fixed designation D4906; 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 5.1.2 Remove the dishes from the oven, place them in a
desiccator for1hto cool to room temperature and weigh.
1.1 This test method covers the total solids and ash content
Return the dishes to the oven for1hat 93°C and, after cooling
of finishing materials.
in a desiccator for 1 h, weigh again.
1.2 The values stated in SI units are to be regarded as the
5.1.3 If the weight loss in the 1-h drying period did not
standard.
change the total solids percentage more than 0.1 %, report the
1.3 This standard does not purport to address all of the
results. If greater than 0.1 % loss was obtained from the last
safety concerns, if any, associated with its use. It is the
1-h drying period, then repeat the drying until the change is
responsibility of the user of this standard to establish appro-
less than 0.1 %.
priate safety and health practices and determine the applica-
5.2 Ash:
bility of regulatory limitations prior to use.
5.2.1 Place each platinum dish, containing the residue from
2. Significance and Use the total solids determination, in a muffle furnace at 600°C 6
25°C for 2 h.
2.1 This test method is intended for use in determining the
5.2.2 If difficulty is encountered in completely burning off
total solids content and the ash content of a finishing material
the carbon, leach the residue with hot water (filtering through
before its use on any leather.
ashless filter paper) and further ignite this residue in the muffle
3. Apparatus
furnace.
5.2.3 To the dish containing the cooled ash, add the filtrate;
3.1 Two Tared Platinum Dishes.
evaporatetodrynessandheatfor30minat600°C 625°C.The
3.2 Drying Oven, that operates at 43°C 6 3°C and 93°C 6
product shall then be cooled in a dessicator and weighed.
3°C.
3.3 Desiccator, with calcium chloride or other desiccant.
6. Calculation
3.4 Muffle Furnace, capable of maintaining temperatures of
6.1 The percent total solids of the finishing material shall be
(600°C 6 25°C).
calculated as follows:
4. Sampling
A
Total solids, percent 5 3 100 (1)
4.1 One 5- g and one 10-g sample of the finishing material
B
shall be weighed with accuracy to within 0.001 g.
where:
A = final weight of solid matter after drying, and
5. Procedure
B = the original weight of the sample.
5.1 Total Solids:
6.2 The percent ash content of the finishing material shall be
5.1.1 Place the samples, which have been weighe
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