ASTM D2876-00(2005)
(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’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. Thiks test method does not apply to wet blue.
1.2This 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)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information.
Designation:D2876–00(Reapproved2005)
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 5.2 Extractor, Reed-Churchill Type —The extraction tube
shall have an internal diameter of 45 6 2 mm and a length of
1.1 This test method covers the determination of the water-
233 6 10 mm. See Fig. 1.
soluble materials in all types of vegetable-tanned leathers.This
5.3 WaterBath, equipped to control the temperature at 35 6
test method does not apply to wet blue.
0.5°C.
1.2 This standard does not purport to address all of the
5.4 CirculatingAirOven,capableofmaintainingatempera-
safety concerns, if any, associated with its use. It is the
ture of 99 6 1°C.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
6. Test Specimen
bility of regulatory limitations prior to use.
6.1 Thespecimenshallconsistofthe5-gleathersamplethat
2. Referenced Documents has been extracted with hexane as directed in Test Method
D3495.Anydeviationfromthissamplesizeshouldbeincluded
2.1 ASTM Standards:
with the analytical results.
D3495 Test Method for Hexane Extraction of Leather
7. Procedure
3. Summary of Test Method
7.1 Insert a plug of cotton or glass wool in the extraction
3.1 The test method gives the amount of water-soluble
tube before the specimen is added. Place the specimen in the
matter extracted from the leather at 35°C by 1 L of water in 3
extraction tube, slurry, and extract at 35°C by adjusting the
h. The leather is first freed of hexane-extractable material by
flow to such a rate as to give 1 L of extract in 3 h. Cool the
extraction with hexane and leaving at ambient temperature in
extract to 23°C, adjust to volume, and thoroughly mix.
an exhaust hood to remove the hexane.
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
99 6 1°C for 16 to 18 h, transfer to a desiccator, cool, and
4.1 The test method is useful for determining the water-
weigh.
soluble materials in vegetable-tanned leathers.
7.3 If the extract is not clear, filter it. During this and
4.2 The water-soluble matter includes the soluble nontan-
subsequent operations, keep funnels and containers covered to
ning components of the tanning materials used, sugars and
prevent changes due to evaporations. Carry out all operations
materials of a similar nature, and inorganic compounds such as
at an ambient temperature of 23 to 25°C. Place a 215-mm
Epsom salts, Glauber’s salts, borax, and other soluble salts
diameter filter paper, pleated so that it contains 32 evenly
added during curing and tannery processing.
divided creases, into a 125-mL funnel. To 2.0 g of kaolin (see
5. Apparatus
Note 1) in a clean glass container add 25 mLof the extract and
stir the mixture to a smooth paste.Add a further 200 mLof the
5.1 Crystallizing Dish, borosilicate glass, 50 mm tall, 70
extractandagainstirthemixturetoauniformsuspension.Pour
mm in outside diameter, and weighing between 30 and 39 g.
the suspension onto the pleated paper in the funnel and collect
the filtrate in the container in which the solution and kaolin
Reed, H. C. and Churchill, J. B., “An Extractor for Water Soluble in Leather,”
This test method is under the jurisdiction ofASTM Committee D31 on Leather Journal of the American Leather Chemists Association, JALCA, Vol 14, 1919, p.
and is the direct responsibility of Subcommittee D31.01 on Vegetable Leather. This 137.
test method was developed in cooperation with the American Leather Chemists The sole source of supply of approved filter paper (C.S. and S. No. 610) for
Assn. (Standard Method B8–1954). tannin determinations known to the committee at this time is Carl Schleicher and
Current edition approved Sept. 1, 2005. Published September 2005. Originally Schuell Co., Keene, NH. If you are aware of alternative suppliers, please provide
approved in 1970 as D2876–70T. Last previous editio
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