ASTM D2876-00(2010)
(Test Method)Standard Test Method for Water-Soluble Matter of Vegetable-Tanned Leather
Standard Test Method for Water-Soluble Matter of Vegetable-Tanned Leather
SIGNIFICANCE AND USE
The test method is useful for determining the water-soluble materials in vegetable-tanned leathers.
The water-soluble matter includes the soluble nontanning components of the tanning materials used, sugars and materials of a similar nature, and inorganic compounds such as Epsom salts, Glauber's salts, borax, and other soluble salts added during curing and tannery processing.
SCOPE
1.1 This test method covers the determination of the water-soluble materials in all types of vegetable-tanned leathers. This test method does not apply to wet blue.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 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.
General Information
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Standards Content (Sample)
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Designation: D2876 − 00(Reapproved 2010)
Standard Test Method for
Water-Soluble Matter of Vegetable-Tanned Leather
This standard is issued under the fixed designation D2876; 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. Apparatus
1.1 This test method covers the determination of the water- 5.1 Crystallizing Dish, borosilicate glass, 50 mm tall, 70
soluble materials in all types of vegetable-tanned leathers.This mm in outside diameter, and weighing between 30 and 39 g.
test method does not apply to wet blue. 3
5.2 Extractor, Reed-Churchill Type —The extraction tube
1.2 The values stated in SI units are to be regarded as shall have an internal diameter of 45 6 2 mm and a length of
standard. No other units of measurement are included in this 233 6 10 mm. See Fig. 1.
standard.
5.3 WaterBath, equipped to control the temperature at 35 6
1.3 This standard does not purport to address all of the
0.5°C.
safety concerns, if any, associated with its use. It is the
5.4 CirculatingAirOven,capableofmaintainingatempera-
responsibility of the user of this standard to establish appro-
ture of 99 6 1°C.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
6. Test Specimen
6.1 Thespecimenshallconsistofthe5-gleathersamplethat
2. Referenced Documents
has been extracted with hexane as directed in Test Method
2.1 ASTM Standards:
D3495.Anydeviationfromthissamplesizeshouldbeincluded
D3495 Test Method for Hexane Extraction of Leather
with the analytical results.
3. Summary of Test Method
7. Procedure
3.1 The test method gives the amount of water-soluble
7.1 Insert a plug of cotton or glass wool in the extraction
matter extracted from the leather at 35°C by 1 L of water in 3
tube before the specimen is added. Place the specimen in the
h. The leather is first freed of hexane-extractable material by
extraction tube, slurry, and extract at 35°C by adjusting the
extraction with hexane and leaving at ambient temperature in
flow to such a rate as to give 1 L of extract in 3 h. Cool the
an exhaust hood to remove the hexane.
extract to 23°C, adjust to volume, and thoroughly mix.
7.2 If the extract is clear, pipet 100 mL into a tared
4. Significance and Use
crystallizing dish, evaporate and dry in a circulating air oven at
4.1 The test method is useful for determining the water-
99 6 1°C for 16 to 18 h, transfer to a desiccator, cool, and
soluble materials in vegetable-tanned leathers.
weigh.
4.2 The water-soluble matter includes the soluble nontan-
7.3 If the extract is not clear, filter it. During this and
ning components of the tanning materials used, sugars and
subsequent operations, keep funnels and containers covered to
materials of a similar nature, and inorganic compounds such as
prevent changes due to evaporations. Carry out all operations
Epsom salts, Glauber’s salts, borax, and other soluble salts
at an ambient temperature of 23 to 25°C. Place a 215-mm
added during curing and tannery processing.
diameter filter paper, pleated so that it contains 32 evenly
divided creases, into a 125-mL funnel. To 2.0 g of kaolin (see
This test method is under the jurisdiction ofASTM Committee D31 on Leather
and is the direct responsibility of Subcommittee D31.01 on Vegetable Leather. This
test method was developed in cooperation with the American Leather Chemists Reed, H. C. and Churchill, J. B., “An Extractor for Water Soluble in Leather,”
Assn. (Standard Method B8–1954). Journal of the American Leather Chemists Association, JALCA, Vol 14, 1919, p.
Current edition approved April 1, 2010. Published May 2010. Originally 137.
approved in 1970. Last previous edition approved in 2005 as D2876–00 (2005). The sole source of supply of approved filter paper (C.S. and S. No. 610) for
DOI: 10.1520/D2876-00R10. tannin determinations known to the committee at this time is Carl Schleicher and
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