ASTM D2462-90(2008)
(Test Method)Standard Test Method for Moisture in Wool by Distillation With Toluene
Standard Test Method for Moisture in Wool by Distillation With Toluene
SIGNIFICANCE AND USE
Test Method D 2462 for testing for moisture in wool is considered satisfactory for acceptance testing of commercial shipments since current estimates of between-laboratory precision are acceptable.
In case of a dispute arising from differences in reported test results when using Test Method D 2462 for acceptance testing of commercial shipments, the purchaser and the supplier should conduct comparative testing to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of the bias. As a minimum, the two parties should take a group of test specimens that are as homogenous as possible and that are from a lot of the type material in question. The test specimens should be assigned in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using Student's t-Test for unpaired data and an acceptance probability level chosen by the two parties before the test is begun. If a bias is found, either its cause must be found and corrected or the purchaser and the supplier must agree to interpret future test results in light of the known bias.
This test method is the preferred method for all suitable samples of wool where it is important to obtain a result free from the possible biases, introduced by the conditions discussed in 5.3 and 5.4.
This test method is free from the interferences caused by different conditions of ambient atmosphere such as might affect the results of oven-drying. A slight amount of residual moisture may be retained in a specimen subjected to oven-drying because of the relative humidity of the ambient air; however, the amount of moisture retained may be estimated from published data.
This test method is free from the interference caused by nonaqueous volatile material. Such material, when present, is erroneously measured as moisture by oven-drying methods, the extent of the error depending upon the amount and chara...
SCOPE
1.1 This test method covers the determination of the amount of moisture present in grease wool, scoured wool, carded wool, garnetted wool, wool top and intermediate wool products, and rovings, by distillation with toluene.
1.2 Equations are given for calculating the amount of water present as moisture content (as-received basis) and moisture regain (dry fiber) basis. The term that corresponds to the basis used in the calculation and report must always be stated.
1.3 This test method is not applicable to material known to contain any steam-distillable, water-soluble matter. If it is suspected that such matter is present, the method should be used with caution.
1.4 Xylene or other solvents should not be substituted for toluene as no other solvents have been evaluated for use in this standard.
Note 1—The determination of moisture in wool by oven-drying is covered in Test Method D 1576 and for textile materials in general in Test Methods D 2654. A method for sampling wool for the determination of moisture in wool is covered in Practice D 2525.
1.5 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 specific safety hazard statements, see Section 8.
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Designation: D2462 − 90 (Reapproved2008)
Standard Test Method for
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Moisture in Wool by Distillation With Toluene
This standard is issued under the fixed designation D2462; 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 D1776 Practice for Conditioning and Testing Textiles
D2258 Practice for Sampling Yarn for Testing
1.1 Thistestmethodcoversthedeterminationoftheamount
D2525 Practice for Sampling Wool for Moisture
ofmoisturepresentingreasewool,scouredwool,cardedwool,
D2654 Test Method for Moisture in Textiles (Withdrawn
garnetted wool, wool top and intermediate wool products, and
3
1998)
rovings, by distillation with toluene.
D3333 Practice for Sampling Manufactured Staple Fibers,
1.2 Equations are given for calculating the amount of water
Sliver, or Tow for Testing
present as moisture content (as-received basis) and moisture
E123 SpecificationforApparatusforDeterminationofWater
regain (dry fiber) basis. The term that corresponds to the basis
by Distillation
used in the calculation and report must always be stated.
3. Terminology
1.3 This test method is not applicable to material known to
3.1 Definitions:
contain any steam-distillable, water-soluble matter. If it is
3.1.1 grease wool, n.—wooltakenfromthelivingsheepand
suspected that such matter is present, the method should be
which has not been commercially scoured.
used with caution.
3.1.2 moisture content, n.—the amount of moisture in a
1.4 Xylene or other solvents should not be substituted for
materialdeterminedunderprescribedconditionsandexpressed
toluene as no other solvents have been evaluated for use in this
as a percentage of the mass of the moist material, that is, the
standard.
original mass comprising the oven-dried substance plus any
NOTE 1—The determination of moisture in wool by oven-drying is
moisture present.
covered in Test Method D1576 and for textile materials in general in Test
3.1.2.1 Discussion—The term “mass” is the correct desig-
Methods D2654. A method for sampling wool for the determination of
nation for the property commonly designated as “weight.” A
moisture in wool is covered in Practice D2525.
slight amount of residual moisture may not be removed from a
1.5 This standard does not purport to address all of the
specimen subjected to oven drying because of the relative
safety concerns, if any, associated with its use. It is the
humidity of the ambient air. The amount of moisture retained
responsibility of the user of this standard to establish appro-
by a specimen may be estimated from published data. There
priate safety and health practices and determine the applica-
may also be a slight additional loss in mass caused by the
bility of regulatory limitations prior to use. For specific safety
evaporation of volatile material other than water, the amount
hazard statements, see Section 8.
depending on the characteristics of any added oils or emul-
sions.
2. Referenced Documents
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3.1.3 moisture-free, adj.—the condition of a material that
2.1 ASTM Standards:
has been exposed in an atmosphere of desiccated air until there
D123 Terminology Relating to Textiles
is no further significant change in its mass (see Discussion
D1060 PracticeforCoreSamplingofRawWoolinPackages
under 3.1.2)
for Determination of Percentage of Clean Wool Fiber
3.1.3.1 Discussion—Heating the material and the desiccated
Present
air to temperatures as high as 110°C increases the rate of
D1576 Test Method for Moisture in Wool by Oven-Drying
moisture loss but does not change the final equilibrium mass of
the moisture-free material.
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This test method is under the jurisdiction ofASTM Committee D13 on Textiles
3.1.4 moisture regain, n.—the amount of moisture in a
and is the direct responsibility of Subcommittee D13.13 on Wool and Felt.
materialdeterminedunderprescribedconditionsandexpressed
Current edition approved Aug. 1, 2008. Published October 2008. Originally
approved in 1966. Last previous edition approved in 2001 as D2462 – 90 (2001).
as a percentage of the mass of the moisture-free material (see
DOI: 10.1520/D2462-90R08.
moisture content).
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
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