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D4847-02 – Standard Test Method Technical Guide
ASTM D4847-02 (Reapproved 2008) defines the minimum performance requirements for woven textiles used in awnings, canopies, and similar outdoor fabric structures. Applicable to fabrics of any fiber composition, the specification details rigorous criteria for breaking strength, tearing strength, and colorfastness to light, crocking, and atmospheric contaminants to ensure endurance in demanding outdoor environments.
⚠️ Referenced Test Method Status: Users should be aware that ASTM D434 (Resistance to Slippage of Yarns), referenced in this standard, has been withdrawn. Parties relying on this standard must define alternative seam performance metrics or reference the specific version of D434 cited in their contractual agreements.
📐 Scope and Material Applicability
The specification covers all woven awning and canopy fabrics, irrespective of the specific textile fiber or blend used (Section 1.1). The stated requirements apply to both warp (lengthwise) and fill (widthwise) orientations where directionality is a factor. The standard relies on established ASTM and AATCC methodologies for testing, including Terminology D123 for consistent definitions. It is the user’s responsibility to establish safe laboratory practices when conducting the referenced physical tests.
📊 Core Performance Requirements (Table 1)
The following table summarizes the principal performance criteria derived from the specification. All values represent minimum conformance thresholds unless otherwise noted, applied consistently to both warp and fill directions.
| 🎯 Property | 📏 Test Method | 🟦 Requirement (Warp & Fill) |
|---|---|---|
| Breaking Strength | ASTM D5034 (Grab Test) | ≥ 300 lbf (1.33 kN) |
| Tearing Strength | ASTM D1424 (Elmendorf) | ≥ 20 lbf (89 N) |
| Resistance to Yarn Slippage | ASTM D434 (Withdrawn 2003) | ≤ 1/4 in. (6.4 mm) seam opening |
| Colorfastness to Light | AATCC 16 | Class 4 (Gray Scale for Color Change) |
| Colorfastness to Crocking (Dry) | AATCC 8 or 116 | Grade 4 (Chromatic Transference Scale) |
| Colorfastness to Crocking (Wet) | AATCC 8 or 116 | Grade 3 (Chromatic Transference Scale) |
| Colorfastness to Burnt Gas Fumes | AATCC 23 | Class 4 (Gray Scale for Color Change) |
| Colorfastness to Ozone (High Humidity) | AATCC 129 | Class 4 (Gray Scale for Color Change) |
| Water Resistance | AATCC 35 (Rain Test) | ≤ 4.0 in. (10.2 cm) penetration |
| Water Repellency | AATCC 22 (Spray Test) | Grade 80 (Initial Rating) |
✅ Test Method Compliance: Sections 2.1 and 2.2 of the standard mandate reference to the current editions of each ASTM and AATCC test method. Evaluation procedures, including the Gray Scales (AATCC Evaluation Procedure 1 & 2) and the Chromatic Transference Scale (Evaluation Procedure 9), must be strictly followed for accurate grading.
⚙️ Significance and Use in Specification Compliance
Section 5 provides critical context for implementing D4847. While conformance to Table 1 is the primary benchmark for producer-consumer agreements, Section 5.2 acknowledges the inherent variability in textile construction. An almost infinite combination of yarn types, twists, and finishes exists, meaning that perfectly functional and aesthetically desirable fabrics may deviate from specific numerical thresholds. The specification provides a robust baseline for performance, but it is not an absolute gatekeeper for market acceptability.
💡 Technical Tip: For water resistance verification, the AATCC 35 Rain Test measures water penetration height under controlled spray pressure. To evaluate surface wetting rather than penetration, the AATCC 22 Spray Test is the appropriate method. Both are routinely required for comprehensive weather resistance profiling of canopy fabrics.
❓ Frequently Asked Questions
🔍 Does this standard apply to all fiber types for awnings?
Yes. Section 1.1 explicitly states that the performance specification covers woven fabrics composed of any textile fiber or mixture of fibers, including solution-dyed acrylic, polyester, cotton, or fiberglass blends.
💡 What should be done about the withdrawn D434 seam slippage test?
Since D434 is referenced but withdrawn, testing labs and quality teams must mutually agree on an alternative method. Common replacements include seam efficiency protocols or ASTM D1683. The specific version of D434 may still be cited for legacy contracts, but current best practices recommend a modern alternative.
⚡ Why are colorfastness to gas fumes and ozone important?
These tests (AATCC 23 and 129) simulate exposure to industrial and urban pollutants. An awning failing these tests may experience dramatic color shift or fading from exhaust fumes and smog, distinct from UV-related fading. This is critical for fabrics used in metropolitan environments.
📌 Does the standard cover coated or laminated fabrics?