ASTM D1234-85(2001)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D1234–85 (Reapproved 2001)
Standard Test Method of
Sampling and Testing Staple Length of Grease Wool
This standard is issued under the fixed designation D 1234; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.1 grease wool, n—wool taken from the living sheep and
2 which has not been commercially scoured.
1.1 This test method covers procedures for sampling and
3.1.2 staple, n—in grease wool, a tuft or lock of fibers
measuring the unstretched staple length, and variability in
which naturally cling together, as found in a fleece.
length,ofgreaseorpulledwoolstaples.Thetestmethodisalso
3.1.3 staple length, n—in grease wool, the length of a staple
applicabletomohairandotheranimalfibersinstapleform.The
obtained by measuring the natural staple without stretching or
procedure is not recommended for individual fibers or groups
disturbing the crimp of the fibers.
of straightened fibers.
3.1.4 For definitions of other terms used in this test method,
NOTE 1—The determination of fiber length in wool top is covered in
refer to Terminology D 123.
Test Method D 519, the determination of fiber length of wool is covered
in Test Method D 1575.
4. Summary of Test Method
1.2 The values stated in inch-pound units are to be regarded
4.1 By hand or by means of a sampling tool, staples
as the standard. The values stated in SI units are provided for
(subsampling units) are withdrawn from randomly selected
information purposes only.
sampling units (bags, bales, or packages) from a lot of wool or
1.3 This standard does not purport to address the safety
other animal fibers. The unstretched lengths of the staples are
concerns, if any, associated with its use. It is the responsibility
measured and the average staple length, standard deviation,
of the user of this standard to establish appropriate safety and
and coefficient of variation calculated.
health practices and determine the applicability of regulatory
5. Significance and Use
limitations prior to use.
5.1 The testing procedure in this test method for the
2. Referenced Documents
determination of staple length is considered satisfactory for
2.1 ASTM Standards:
acceptance testing of commercial shipments of grease wool
D 123 Terminology Relating to Textiles
since the method has been used in the trade for acceptance
D 519 Test Method for Length of Fiber in Wool Top
testing.
D 1575 Test Method for Fiber Length of Wool in Scoured
5.1.1 In case of a dispute arising from differences in
Wool and Card Sliver
reported test results when using this test method for acceptance
D 4271 Practice forWriting Statements on Sampling inTest
testing of commercial shipments, the purchaser and the sup-
Methods for Textiles
plier should conduct comparative tests to determine if there is
a statistical bias between their laboratories. Competent statis-
3. Terminology
tical assistance is recommended for the investigation of bias.
3.1 Definitions:
As a minimum, the two parties should take a group of test
specimens that are as homogeneous as possible and that are
from a lot of material of the type in question. The test
This method is under the jurisdiction ofASTM Committee D13 onTextiles and
specimens should then be randomly assigned in equal numbers
is the direct responsibility of Subcommittee D13.13 on Wool and Wool Felt.
to each laboratory for testing.The average results from the two
Current edition approved Oct. 21, 1985. Published December 1985. Originally
laboratories should be compared using Student’s t-test for
published as D 1234 – 52 T. Last previous edition D 1234 – 80.
unpaireddataandanacceptableprobabilitylevelchosenbythe
Further information covering the procedures and techniques described in this
method appears in D. D. Johnston, H. Dean Ray, W. J. Manning, and E. M. Pohle,
two parties before the testing is begun. If a bias is found, either
“Relationships of Staple Length in Grease Wool and Resultant Top,” Textile
its cause must be found and corrected, or the purchaser and the
Research Journal, Vol 21, October 1951, pp. 757–762.
supplier must agree to interpret future test results in the light of
Annual Book of ASTM Standards, Vol 07.01.
Annual Book of ASTM Standards, Vol 07.02. the known bias.
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D1234
5.2 The test method is used for the determination of the 6.3 Ruler—Ascale graduated in inches and 0.25-in. (5-mm)
average unstretched staple length and the staple length distri- divisions or a metric scale graduated in millimetres.
bution of a lot of wool in order to assign length classes when
7. Sampling
determining the conformance of lots and shipments to length
specifications. 7.1 Lot Sample—As a lot sample for acceptance testing,
take at random the number of packages of wool from a lot as
5.3 In this test method, the size of a lot covered by the test
procedure is limited to not more than 200 packages per test. directed in Table 1. Consider packages of wool as the primary
sampling units.
Any shipment exceeding the above limits is divided into lots
within the prescribed limits. 7.2 Laboratory Samples—Consider the packages of wool in
1 3 1 3 1 3 1 5
in. ⁄8 ⁄16 ⁄4 ⁄8 ⁄2 3 ⁄8 4 4 ⁄2 4 ⁄8 24
mm 3.0 5.0 6.0 10.0 13.0 86.0 102.0 114.0 118.0 610.0
FIG. 1 Wool Staple Sampling Tool
5.4 The nature of the sampling procedure is such that grease the lot sample as the laboratory sample.
wool staples as originally drawn from the wool of the lot 7.3 Test Specimens—From each package in the laboratory
require only a slight amount of preparation before measure- sample,taketenstaples,withfivestaplesbeingtakenatequally
ment. The bulk and laboratory samples are synonymous in this spaced intervals from each of two opposite sides of the
method. package. Each staple should be about 0.25 in. (5 mm) in
5.5 Compression of wool in the bale makes it difficult to diameter. If larger, reduce the staple to the correct size by
penetrate the interior of the bale with the sampling tool. gently withdrawing the excess fibers from one side of the
However, staples can be drawn from the surface of the bale staple. Take the staples as follows:
with the sampling tool or by hand. 7.3.1 Sampling by Tool:
5.6 Practice D 4271 contains information on how to write a 7.3.1.1 Depth of Draw—Gage the depth for inserting the
section on sampling in test methods. sampling tool so that different levels of the package are
sampled. For example, draw the first specimen from the center
NOTE 2—An extensive discussion of grease wool staple sampling can
5 of the package, the next about two thirds of the distance from
be fo
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