ASTM D1907/D1907M-12
Standard Test Method for Linear Density of Yarn (Yarn Number) by the Skein Method

Standard No.

ASTM D1907/D1907M-12

Release Date

2012

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM D1907/D1907M-12(2018)

Latest

ASTM D1907/D1907M-12(2018)

Scope

Test Method D1907 is considered satisfactory for acceptance testing of commercial shipments, since it has been used extensively in the trade for that purpose.

In case of dispute arising from differences in reported test results when using Test Method D1907 for acceptance testing of commercial shipments, the purchaser and the supplier should conduct comparative tests to determine if there is a statistical bias between their laboratories.

Competent statistical assistance is recommended for the determination of such a bias. As a minimum, the two parties should take a group of test specimens that are as homogeneous as possible, and that are from the same lot of the material in question. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using statistical analysis for unpaired data, and an acceptable probability level chosen by the parties before testing begins. If a bias is found, either its cause must be identified and corrected, or the purchaser and supplier must agree to interpret future test results for that material with consideration to the known bias.

This test method is intended primarily for the determination of the average linear density of yarns. However, the variations identified by the results may also provide useful information. If the coefficient of variation is to be calculated, each skein must be weighed separately, and a larger number of skeins will need to be tested (as compared to the number of skeins to be tested for the determination of the average yarn linear density alone).

This test method includes seven options, depending on whether the yarn is scoured before weighing, weighed in the conditioned or oven-dried state, or whether or not the results obtained are adjusted for commercial moisture regain, or a commercial allowance. Option 1 (unscoured, conditioned yarn) is generally used for yarns spun on the cotton system, while Options 6 and 7 (scoured, oven dried yarn, plus commercial moisture regain, or allowance) are generally used for filament yarns, or yarns containing wool fibers. The specific options to be used in any instance shall be agreed upon by the parties, or as prescribed in test methods or tolerances.

In Options 2, 3, 5, 6, and 7, an oven-dried sample is obtained by exposing the yarn in an oven with a supply of air at standard textile testing conditions, as described in 6.3.

1.1 This test method covers the determination of the linear density of all types of yarn in package form, subject to the limitations of size and stretch given in 1.2 and 1.3. Provision is made for expressing yarn linear density in all the traditional yarn numbering systems.

1.2 This test method is applicable to yarns that stretch less than 5 % when tension on the yarn is increased from 0.25 to 0.75 cN/tex [0.25 to 0.75 gf/tex]. By mutual agreement, and use of a lower than specified reeling tension, this method may also be adapted to measure the linear density of yarns that stretch more than 5 %, under the above force.

1.3 This method is applicable to yarns finer than 2000 tex. However, it may be also adapted to coarser yarns by the use of skeins of shorter than specified lengths, and alternate reeling conditions, agreeable to the interested parties.

1.4 Depending on the procedure used to calculate the moisture content of the yarn being tested, and its actual moisture content, or finish content, or both, one or more of the following options may be utilized.

1.4.1 Unscoured Yarn:

Option 1Yarn at equilibrium with the standard atmosphere for testing textiles.

Option 2Oven-dried yarn.

Option 3

ASTM D1907/D1907M-12 Referenced Document

• ASTM D1059 Standard Test Method for Yarn Number Based on Short-Length Specimens
• ASTM D123 Standard Terminology Relating to Textiles
• ASTM D1578 Standard Test Method for Breaking Strength of Yarn in Skein Form
• ASTM D1909 Standard Table of Commercial Moisture Regains for Textile Fibers
• ASTM D2257 Standard Test Method for Extractable Matter in Textiles
• ASTM D2258 Standard Practice for Sampling Yarn for Testing
• ASTM D2494 Standard Test Method for Commercial Mass of a Shipment of Yarn or Man-Made Staple Fiber or Tow
• ASTM D4849 Standard Terminology Related to Yarns and Fibers
• ASTM D541 Specification for Single Jute Yarn
• ASTM D578 Standard Specification for Glass Fiber Strands
• ASTM D681 Standard test method for accelerated temperature aging of printing and writing papers using oven exposure apparatus

ASTM D1907/D1907M-12 history

• 2018 ASTM D1907/D1907M-12(2018) Standard Test Method for Linear Density of Yarn (Yarn Number) by the Skein Method
• 2012 ASTM D1907/D1907M-12 Standard Test Method for Linear Density of Yarn (Yarn Number) by the Skein Method
• 2007 ASTM D1907-07 Standard Test Method for Linear Density of Yarn (Yarn Number) by the Skein Method
• 2001 ASTM D1907-01 Standard Test Method for Linear Density of Yarn (Yarn Number) by the Skein Method
• 2001 ASTM D1907-97 Standard Test Method for Linear Density of Yarn (Yarn Number) by the Skein Method