Standard Test Method for
Hexane Extraction of Leather1
This standard is issued under the fixed designation D 3495; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the 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.
1.1 This test method covers the quantitative extraction of all
types of leather with hexane. This test method does not apply
to wet blue.
1.2 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.
2. Referenced Documents
2.1 ASTM Standards:
D 2813 Practice for Sampling Leather for Physical and
D 3790 Test Method for Volatile Matter (Moisture) of
Leather by Oven Drying2
3. Significance and Use
3.1 This test method measures the amount of hexane soluble lubricant present in all types of leather. Adequate
lubrication prevents the abrasion of leather fibres during flexing.
This lubrication is generally obtained from the fat liquor added
at the tannery. Some lubrication is also obtained from natural
grease produced during the life of the animal.
4.1 Analytical Balance.
4.2 Soxhlet Apparatus, consisting of a boiling flask, extraction tube, and condenser.
4.3 Forced Circulating Air Oven, capable of maintaining the
4.4 Electric Hot Plate.
4.5 Extraction Thimbles, fat-free, cellulose, Alundum, or
4.6 Absorbent Cotton, fat-free.
4.7 Steam Bath.
5.1 Hexane, ACS Reagent Grade conforming to the following requirements:
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