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D6477-23 – Standard Test Method Technical Guide
ASTM D6477 – 23, titled Standard Terminology Relating to Tire Cord, Bead Wire, Hose Reinforcing Wire, and Fabrics, is the definitive lexical standard for Subcommittee D13.19 on Industrial Fibers and Metallic Reinforcements. This compilation standard provides unambiguous definitions for the tire cord and fabric industry, ensuring consistency across testing, manufacturing, and quality assurance documentation.
📜 Scope and Significance of D6477-23
Developed under the jurisdiction of ASTM Committee D13 on Textiles, this terminology standard is uniquely tailored to the tire cord fabric industry. Its primary functions are to serve as a specialized dictionary and to act as a strategic management tool for Subcommittee D13.19 to identify, eliminate, and prevent terminological redundancies. The standard strictly adheres to internationally recognized principles on standardization set by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
💡 Key Application: D6477 is an essential companion guide for interpreting all related D13.19 test methods. It provides the foundational definitions required for executing adhesion tests (D2229, D4776), tensile tests (D7269), and thermal shrinkage tests (D4974, D5591).
📚 Core Terminology and Definitions
The heart of the standard is Section 3, which houses the precise lexicon of the industry. Terms such as abrasion, adhesion, and air wicking are standardized to maintain unambiguity. Note that D6477 gives an overarching definition for adhesion as a material property to resist delamination, which complements the more application-specific definitions found in the individual test methods.
| 🟦 Defined Term | 📐 Core Definition (from D6477-23) | 🎯 Referenced Origin Method |
|---|---|---|
| Abrasion | The wearing away of any part of a material by rubbing against another surface. | D6611 |
| Adhesion (Material Property) | The property denoting the ability of a material to resist delamination or separation into two or more layers. | D6477 |
| Adhesion (Tire Fabrics) | The force required to separate a textile material from rubber or other elastomer by a definite prescribed method. | D1871, D2229, D4776 |
| Adhesive Treated Tire Cord | A tire cord whose adhesion to rubber has been improved by the application of a dip followed by rapid drying and normally additional heat treatment. | D5591 |
| Air Wicking | In tires, the passage of air longitudinally along or through yarns in a fabric that has been encased and cured. | D6477 |
🔗 Interconnected Standards Ecosystem
D6477 does not exist in a vacuum. It cross-references a comprehensive suite of ASTM test methods covering the full spectrum of material evaluation. This network ensures that the terminology aligns perfectly with the testing procedures for tire cords, bead wire, hose reinforcing wire, and fabrics.
| 📏 ASTM Designation | ⚡ Specific Focus / Test Type |
|---|---|
| D885/D885M | Tire Cords, Fabrics, and Industrial Filament Yarns |
| D2229 | Adhesion Between Steel Tire Cords and Rubber |
| D2692/D2692M | Air Permeability of Tire Fabrics, Cords, and Yarns |
| D2969 | Steel Tire Cords |
| D4776/D4776M | Adhesion of Cords to Rubber (H-Test Procedure) |
| D4974/D4974M | Hot Air Thermal Shrinkage of Yarn and Cord |
| D5591 | Thermal Shrinkage Force of Yarn and Cord |
| D6320/D6320M | Hose Reinforcing Wire Made from Steel |
| D7269/D7269M | Tensile Testing of Aramid Yarns |
⚠️ Important Advisory: Several referenced test methods including D885/D885M, D1871, D2229, D2969, D2970, D4975, and D6320 have been withdrawn by ASTM. Practitioners must verify the current status of these documents and consult the latest approved versions or alternative standards to ensure compliance with current industry practices.
❓ Frequently Asked Questions
🔍 What is the primary scope of ASTM D6477-23?
D6477 compiles all definitions developed by Subcommittee D13.19. It is exclusively focused on terminology for the tire cord, bead wire, hose reinforcing wire, and fabrics industries, functioning both as a dictionary and a tool for managing terminological standards.
💡 How does this standard differentiate between types of “adhesion”?
It provides a generic definition of adhesion as the ability to resist delamination. This is supplemented in the standard’s cross-references by the specific operational definitions found in D1871, D2229, and D4776, which define adhesion as the force required to separate a textile from an elastomer by a specific method.
⚡ What does “air wicking” refer to in the tire industry?
Per D6477, air wicking is the longitudinal passage of air along or through yarns within a cured fabric. Preventing this phenomenon is critical for maintaining tire integrity and preventing ply separation or inflation pressure loss.
📌 Which standard is referenced for testing the thermal shrinkage force of yarn?
ASTM D5591 is the specific test method referenced within D6477 for measuring the thermal shrinkage force of yarn and cord, which is distinct from the linear shrinkage measurement defined in D4974/D4974M.