ASTM D1578-93(2022) PDF

Overview

ASTM D1578-93(2022): Standard Test Method for Breaking Strength of Yarn in Skein Form is a key ASTM standard used to determine the breaking strength of spun yarns in skein form. This test method allows yarn manufacturers, suppliers, and end-users to assess the force required to break a skein of yarn under controlled conditions. The test is widely recognized in the textile industry for its reliability and reproducibility, especially when used for acceptance testing of commercial shipments.

The method is applicable to both single and plied spun yarns made from any type of fiber or blend, but it is not suitable for yarns that stretch more than 5% under specified tension conditions. ASTM D1578 provides three test options to accommodate different reel sizes, numbers of turns, and break timings, facilitating national and international use. This test method is also commonly paired with linear density determinations.

Key Topics

• Breaking Strength of Yarn: The standard defines procedures to measure the force (expressed in units of force) required to break skeins prepared from spun yarns. It provides formulas for calculating skein breaking tenacity and break factor, which are key indicators of yarn quality.
• Applicability: Suitable for spun yarns (single or plied) composed of any fiber or blend, but not for yarns with high stretch exceeding 5% under specified loading. Not generally used for filament yarns due to their uniform properties.
• Test Options:
  • Option 1: 80, 40, or 20 turns on a 1.50 m or 1.5 yd reel, with breakage at 300 mm/min or 12 in./min (common in the United States).
  • Option 2: 50 turns on a 1 m or 1 yd reel, same break speed (common for woolen yarns).
  • Option 3: 50 turns on a 1 m reel, with breakage occurring in 20 seconds (adopted by ISO for international use).
• Interlaboratory Consistency: Guidance for resolving discrepancies in test outcomes between laboratories, including the use of comparative testing and statistical analyses (e.g., Student’s t-test).
• Test Apparatus and Preparation: Requirements for reels, tensile testing machines, and methodical specimen preparation for reproducible results.

Applications

The breaking strength test for yarn in skein form is critical for a range of practical applications in the textile industry:

• Quality Control and Assurance: Ensures the yarn meets required performance criteria before further processing or shipment.
• Supplier-Buyer Agreements: Used as a basis for acceptance testing in commercial shipments, providing an objective measure of product uniformity and strength.
• Product Development and Comparison: Allows researchers and manufacturers to benchmark new yarns or production methods against established performance standards.
• Dispute Resolution: Provides a standardized, statistically robust methodology for resolving interlaboratory differences in measured breaking strength.
• Regulatory Compliance: Assists in meeting the requirements of contracts or government procurement, given its approval by agencies such as the U.S. Department of Defense.

Related Standards

Several other ASTM standards are referenced or complement the use of ASTM D1578:

• ASTM D2256: Test Method for Tensile Properties of Yarns by the Single-Strand Method – suitable for testing breaking strength and elongation of yarns using single strands.
• ASTM D1907: Test Method for Linear Density of Yarn by the Skein Method – often combined with D1578 for a comprehensive yarn assessment.
• ASTM D76: Specification for Tensile Testing Machines for Textiles – specifies apparatus requirements for tensile testing.
• ASTM D1776: Practice for Conditioning and Testing Textiles – provides guidelines on sample conditioning for reliable results.
• ASTM D2258: Practice for Sampling Yarn for Testing – covers sampling procedures to ensure representative results.
• ASTM D4849 and ASTM D123: Terminology standards that provide definitions of textile terms used in the test method.

Keywords: breaking strength of yarn, skein breaking tenacity, skein break factor, spun yarn testing, ASTM D1578, textile quality control, yarn test method, acceptance testing, skein form, yarn strength standard.