ASTM D7674-10
(Test Method)Standard Test Method for Hexane/Petroleum Ether Extract in Wet Blue and Wet White
Standard Test Method for Hexane/Petroleum Ether Extract in Wet Blue and Wet White
SIGNIFICANCE AND USE
This test method measures the amount of solvent-soluble (hexane or petroleum ether) materials in wet blue and wet white.
SCOPE
1.1 This test method covers the quantitative extraction of all types of wet blue and wet white with hexane or petroleum ether.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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. For a specific hazard statement, see Section 7.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D7674 − 10
StandardTest Method for
Hexane/Petroleum Ether Extract in Wet Blue and Wet White
This standard is issued under the fixed designation D7674; 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 4. Significance and Use
1.1 This test method covers the quantitative extraction of all 4.1 This test method measures the amount of solvent-
types of wet blue and wet white with hexane or petroleum soluble (hexane or petroleum ether) materials in wet blue and
ether. wet white.
1.2 The values stated in SI units are to be regarded as the
5. Apparatus
standard. The values given in parentheses are for information
5.1 Analytical Balance.
only.
5.2 Extraction Apparatus—Soxhlet, consisting of a boiling
1.3 This standard does not purport to address all of the
flask, extraction tube, and condenser. Alternate Extraction
safety concerns, if any, associated with its use. It is the
Apparatus: Soxtec-type system consisting of an extraction unit
responsibility of the user of this standard to establish appro-
and a control unit.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. For a specific
5.3 ForcedCirculatingAirOven,capableofmaintainingthe
hazard statement, see Section 7.
specified temperature.
5.4 Electric Hot Plate (or steam bath).
2. Referenced Documents
5.5 Extraction Thimbles, fat-free: cellulose,Alundum, glass
2.1 ASTM Standards:
microfiber, or fritted glass.
D3495 Test Method for Hexane Extraction of Leather
D6658 Test Method for Volatile Matter (Moisture) of Wet 5.6 Absorbent Cotton, fat-free, or glass wool.
Blue by Oven Drying
6. Reagents and Materials
D6659 Practice for Sampling and Preparation of Wet Blue
for Physical and Chemical Tests
6.1 Hexane, ACS Reagent Grade, or
E691 Practice for Conducting an Interlaboratory Study to
6.2 Petroleum Ether, ACS Reagent Grade.
Determine the Precision of a Test Method
E177 Practice for Use of the Terms Precision and Bias in
7. Hazards
ASTM Test Methods
7.1 All reagents and chemicals should be handled with care.
Before using any chemical, read and follow all safety precau-
3. Summary of Test Method
tions and instructions on the manufacturers’ label or MSDS
3.1 A specimen is analyzed as received in wet state, diced;
(Material Safety Data Sheet).
or pre-dried at the determined setting then ground prior to
analysis. The prepared specimen is extracted with solvent. 8. Sampling
Another specimen from the same sample is also analyzed for
8.1 The wet blue or wet white shall be sampled in accor-
moisture content in accordance with Test Method D6658.
dance with Test Method D6659.
Following completion of the extraction process, the extract is
dried, then cooled and weighed. The extract is reported as
9. Procedure
extractables on a moisture-free basis. NOTE 1—Two sample conditions are listed below. Both sample condi-
tions produce acceptable results (See Precision and Bias section).
9.1 Condition A—As received in wet state, diced (prepared
This test method is under the jurisdiction ofASTM Committee D31 on Leather
per Test Method D6659 Method A).
and is the direct responsibility of Subcommittee D31.02 on Wet Blue.
9.1.1 Weigh out specimen for both moisture and hexane/
Current edition approved Nov. 1, 2010. Published December 2010. DOI:
10.1520/D7674-10.
petroleum ether extraction at the same time. For the hexane/
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
petroleum ether extraction, weigh an 8-10 g specimen to the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
nearest 0.001g and record this value as W1. Loosely pack the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. material in an appropriately sized extraction thimble and cover
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D7674 − 10
with a pad of fat-free cotton or glass wool. Proceed with circulating oven at 100 6 2°C (212 6 3.6°F) for 60-65 min or
extractionusingeithertheSoxhletapparatusortheSoxtec-type 25-30 min at 125 6 1°C (257 6 1.8°F). Cool the cups for
apparatus. 30-35 min (or to room temperature) in a desiccator. Continue
9.1.2 Determine the moisture content of the prepared drying for successive 15-min periods until constant weight is
sample from which the specimen for extraction is taken (9.1.1) obtained. When successive weighings vary by less than
in accordance with Test Method D6658. 60.005 g, consider the weight constant. Record this weight to
NOTE 2—The cubed specimen weighed out for extraction may be the nearest 0.001 g as W3. If constant weight has not been
air-dried overnight, prior to extraction.
obtained after the third drying, record that weight as the final
weight.
9.2 Condition B—Oven or air dried, ground (prepared per
Test Method D6659 Method B).
10. Calculation of Results
9.2.1 Weigh a 4-5 g specimen to the nearest 0.001g and
record this value as W1. Loosely pack the material in an
10.1 Calculate the percentage of hexane (or petroleum
appropriately sized extraction thimble and cover with a pad of
ether) extract, on a moisture-free basis, as follows:
fat-free cotton or glass wool. Proceed with extraction using
Hexane (or petroleum ether) extract =
either the Soxhlet apparatus or the Soxtec-type apparatus.
W3 2 W2
9.2.2 Determine the residual moisture content of the pre-
3100 (1)
100 2 % moisture
~ !
pared sample from which the specimen for extraction is taken
W1 3
in accordance with Test Method D6658.
where:
9.3 Soxhlet Apparatus—Place the loaded thimble in the
W1 = weight of specimen, wet blue or wet white,
Soxhlet extraction tube. Dry an extraction flask in an oven for
W2 = weight of extraction flask,
at least1hat100 6 2°C (212 6 3.6°F) to remove residual
W3 = weight of extraction flask and hexane (or
moisture. Cool in a desiccator, and weigh to the nearest 0.001
petroleum ether) extract, and
g. Record this value as W2. Fill the flask approximately
% moisture = moisturecontentofthesamplefromwhichthe
two-thirds full with hexane or petroleum ether, assemble the
specimen was taken.
apparatus, circulate the water through the condenser, and heat
the flask until the extraction of the sample has continued for a
11. Report
minimum of 50 cycles. If the Soxhlet drips continuously
instead of cycling, extract the sample for a minimum of5hat 11.1 Report the hexane (or petroleum ether) extract in the
that setting. At the end of the extraction period, remove the wet blue or wet white as the average value obtained from the
flaskcontainingtheextractionsolventanddriveoffthesolvent.
test results to the nearest 0.01 %.
When 10 to 20 mL of solvent remain, heat gently on a steam
11.2 State that the results are calculated on a moisture-free
bath until the odor of the solvent can no longer be detected.
basis.
Facilitate removal of t
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