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D5278 – Standard Test Method Technical Guide
ASTM D5278/D5278M-09 (Reapproved 2017) provides a standardized procedure for determining the elongation of narrow elastic fabrics using a static-load testing method. Applicable to natural and man-made elastomers, this standard covers testing both before and after laundering.
📐 Scope, Specimens, and Terminology
This test method defines the parameters for testing narrow elastic fabrics. The standard requires the mutual agreement of the parties involved on the specific effective static load to be applied. Specimens must be conditioned according to Practice D1776. Laundering, when specified, follows AATCC Test Method 135 for 3 washing and drying cycles. Key terminology is aligned with D4850 (Fabric Test Methods), D4848 (Force, Deformation), and D123 (Textiles).
💡 Critical Note: The effective static load must be previously selected or mutually agreed upon by the contracting parties. This load is tailored to the specific end-use performance requirements of the fabric being evaluated.
⚠️ Safety and Units: Users must establish appropriate safety and health practices. The standard requires that SI units and inch-pound units be used independently, as the equivalents are not exact.
⚙️ Static-Load Test Procedure and Apparatus
The apparatus consists of a fixture for suspending the specimen and a calibrated scale for measuring elongation. The procedure is strictly defined: a conditioned test specimen is suspended and the agreed-upon static load is applied. After a specified duration, the load is released. This load-hold-release sequence constitutes one cycle, which is repeated a total of three times. The percent elongation is read directly from the scale upon completion of the final cycle.
| 🟦 Test Parameter | 📏 Specification / Detail |
|---|---|
| Test Type | Static-Load Testing |
| Specimen Type | Narrow Elastic Fabrics |
| Conditioning | In accordance with Practice D1776 |
| Laundering Procedure | AATCC 135, 3 complete washing and drying cycles |
| Test Cycles | 3 (load, release, repeat two more times) |
| Unit Systems | SI Units and Inch-Pound Units (independent use) |
📊 Key Measured Properties and Referenced Documents
The primary measured property is elongation, expressed as a percentage of the original specimen length. The standard is part of the ASTM D13.59 subcommittee on Fabric Test Methods. A comprehensive list of referenced documents is provided for context, including alternative test methods.
| 📐 Standard | 🔬 Title / Purpose |
|---|---|
| D4964 | Tension and Elongation of Elastic Fabrics (Constant-Rate-of-Extension Type Tensile Testing Machine) |
| D1775 | Tension and Elongation of Wide Elastic Fabrics (Constant-Rate-of-Load Type) — Withdrawn |
| D123 | Terminology Relating to Textiles |
| D4850 | Terminology Relating to Fabrics and Fabric Test Methods |
| D4848 | Terminology Related to Force, Deformation and Related Properties of Textiles |
Note: For CRE and CRL type tensile testing methods, the standard directs users to D4964 and the now-withdrawn D1775, respectively.
❓ Frequently Asked Questions
🔍 What is the primary difference between D5278 and D4964?
The main distinction is the testing mechanism. D5278 uses a static-load procedure (applying a fixed weight), while D4964 employs a Constant-Rate-of-Extension (CRE) tensile testing machine.
💡 Can the test be performed on fabric that has not been laundered?
Yes. The standard explicitly states the test applies to conditioned test specimens, laundered or unlaundered. If the laundered condition is required, AATCC 135 governs the preparation.
⚡ How many loading cycles does the test require?
The static load is applied for a specified time, completely released, and the cycle is repeated two more times for a total of three cycles. The elongation value is read after the final application.
📌 Why is mutual agreement on the static load necessary?
The standard does not mandate a specific load value. The effective static load is determined through mutual agreement to ensure the test conditions accurately simulate the specific mechanical demands of the fabric’s intended end-use application.