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D4849-21 – Standard Test Method Technical Guide
📖 Purpose and Scope of Terminology Standard D4849–21
ASTM D4849–21 serves as the primary compilation of terminology developed and specifically maintained by ASTM Committee D13.58 on Yarns and Fibers. As a centralized vocabulary resource, its definitions are unique to fibers and yarns within the textile industry, deliberately excluding terms that are already adequately defined in other readily available technical sources.
⚠️ Standard Interrelation: D4849–21 is not an isolated document. It specifically references complementary terminology standards under the jurisdiction of D13.58, including D3888, D4466, and D4848. Users should consult these partner standards for a comprehensive terminology set.
🏛️ Jurisdictional Authority and Revision Workflow
A critical structural element of D4849–21 is the governance of its content. Subcommittee D13.58 holds direct jurisdictional responsibility for every term and definition within this standard. The specific testing standards that utilize the defined terms are listed by number directly after each definition. No wording change can be implemented without the explicit approval of the D13.58 subcommittee and the main Committee D13 on Textiles. Once approved, these changes are subsequently directed to Subcommittee D13.92 on Terminology for integration or harmonization with the broader base standard, Terminology D123.
📝 Technical Note: This workflow ensures that specialized yarn and fiber definitions are reviewed by relevant subject matter experts (D13.58) before being formally synchronized with the overarching textile terminology framework in D123.
📊 Key Referenced Standards and Technical Dependencies
D4849–21 acts as a gateway standard. It provides the language used across dozens of testing and specification standards under the D13 committee. The extensive list of referenced documents in Section 2 provides the practical context for the defined terms. The following tables highlight the major technical dependencies.
Table 1: Tensile, Strength, and Physical Testing Standards
| 🟦 Designation | 📐 Focus Area | 🎯 Primary Application |
|---|---|---|
| D76 | Tensile Testing Machines | Specification for tensile testing apparatus |
| D1422 / D1423 | Twist in Yarns | Untwist-Retwist & Direct Counting methods |
| D1425 | Evenness of Strands | Capacitance testing for yarn uniformity |
| D1577 | Linear Density of Fibers | Fiber linear density measurement |
| D1578 | Breaking Strength (Skein) | Yarn strength in skein form |
| D3217 | Breaking Tenacity | Loop or knot configuration strength |
| D3412 / D3108 | Friction Properties | Yarn-to-Yarn and Yarn-to-Solid friction |
Table 2: Numbering, Sampling, and Tolerances
| 🟦 Designation | 📐 Focus Area | 🎯 Primary Application |
|---|---|---|
| D861 | Tex System | Designation of linear density (tex) |
| D1059 / D1907 | Yarn Number | Short-length & Skein method linear density |
| D1244 | Yarn Construction | Practice for designating construction |
| D2258 / D3333 | Sampling Practices | Sampling yarn / manufactured staple fibers |
| D2260 | Conversion Factors | Conversion between numbering systems |
| D2644 / D2645 | Tolerances | Tolerances for woolen / cotton or worsted yarns |
| D2494 | Commercial Mass | Determining mass of a yarn or fiber shipment |
The terminology defined in D4849–21 provides the linguistic foundation for all the above standards. For example, understanding the definition of “yarn number” is essential before applying Test Method D1059. This standard was developed in accordance with the internationally recognized principles of the World Trade Organization Technical Barriers to Trade (TBT) Committee.
❓ Frequently Asked Questions
🔍 What is the primary scope of ASTM D4849-21?
It is the standard terminology compilation for yarns and fibers, developed and maintained by Subcommittee D13.58. It provides a set of definitions unique to the textile industry for these materials.
💡 Which subcommittee maintains direct jurisdiction over the terms in D4849-21?
Subcommittee D13.58 on Yarns and Fibers holds jurisdictional responsibility. Any changes to the wording of definitions require approval by this subcommittee, followed by the main D13 committee.
⚡ How do changes to D4849-21 get integrated into the broader textile terminology?
After changes are approved by D13.58 and the main D13 committee, they are directed to Subcommittee D13.92 on Terminology for subsequent integration or addition to the parent standard, Terminology D123.
📌 Is D4849-21 the only terminology standard for Subcommittee D13.58?
No. D4849-21 explicitly states it is “not all inclusive” of the terms under the jurisdiction of D13.58. Other terminology standards under this subcommittee include D3888, D4466, and D4848, covering specific sub-domains of textile fibers and yarns.