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D1047-21 – Standard Test Method Technical Guide
ASTM D1047‑21 establishes the material requirements and performance criteria for general‑purpose thermoplastic jackets made from poly(vinyl chloride) (PVC) or vinyl chloride/vinyl acetate copolymers. This standard is essential for manufacturers and specifiers of wire and cable jacketing, providing guidelines for installation, physical durability, and environmental resistance.
📐 Scope and Material Specifications
The specification covers a durable thermoplastic jacket composed of poly(vinyl chloride) or a copolymer of vinyl chloride and vinyl acetate. The jacket material is explicitly rated for a minimum installation temperature of -10 °C. All values stated in the standard are regarded as standard in inch‑pound units; SI values are provided for reference only. Terminology pertinent to this specification is defined in ASTM D1711.
⚙️ Weathering, Physical, and Electrical Requirements
Sunlight and Weather Resistance (Section 4): For materials classified as sunlight and weather resistant, the jacket must retain a minimum of 80 % of its unexposed tensile strength and elongation after 720 hours of exposure in an approved apparatus (dual carbon‑arc, xenon arc, or fluorescent UV). Specimens must be prepared per ASTM D2633, and the surface facing the light source must not be buffed.
General Physical Properties (Section 5): The jacket material must conform to the physical property requirements defined in Table 1 of the standard.
Electrical Performance (Section 5.2): When applied to single‑conductor nonshielded cable rated 2001 to 5000 V phase to phase, the jacket must also meet the surface resistivity and U‑bend discharge requirements outlined in Table 2 of the standard.
| 🟦 Test Parameter | 📐 Specific Requirement |
|---|---|
| Exposure Duration | 720 hours |
| Minimum Tensile Strength Retention | 80 % of unexposed value |
| Minimum Elongation Retention | 80 % of unexposed value |
| Specimen Surface Preparation | No buffing of the exposed face |
📊 Key Compliance Data and Referenced Standards
Material sampling and all required test procedures are conducted in accordance with ASTM D2633, unless otherwise specified within the standard. The specific test cycles for accelerated weathering are critical for achieving valid, reproducible results.
| 🟦 Apparatus Type | 📐 Governing Standard | ⚡ Designated Exposure Cycle |
|---|---|---|
| Xenon-Arc Light Apparatus | ASTM D2565 / Practice G155 | Cycle 1 (Table X3.1 of G155) |
| Enclosed Carbon-Arc Apparatus | ASTM D6360 / Practice G153 | Cycle 1 (Table X1.1 of G153) |
| Fluorescent UV Lamp Apparatus | ASTM D4329 / Practice G154 | Cycle 1 (Appendix X2 of G154) |
⚠️ Critical Test Procedure: Specimens intended for sunlight and weather resistance testing must not have the surface facing the light source buffed or mechanically prepared. According to Section 4 of D1047‑21, altering the surface layer can compromise the valid assessment of the jacket’s inherent UV resistance.
💡 Selection of Test Apparatus: The standard provides flexibility by allowing qualification via xenon‑arc, carbon‑arc, or fluorescent UV apparatus. However, strict adherence to the specific “Cycle 1” parameters defined in the respective ASTM Practices (G153, G154, G155) is mandatory to ensure compliance with the 720‑hour exposure requirement.
❓ Frequently Asked Questions
🔍 What is the minimum recommended installation temperature for a D1047‑21 PVC jacket?
ASTM D1047‑21 specifies a minimum installation temperature of -10 °C for the jacket material to maintain its integrity during application.