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D4771-19 – Standard Test Method Technical Guide
📐 Scope and Classification
ASTM D4771-19 establishes performance requirements for knitted upholstery fabrics used in the manufacture of new indoor furniture for general domestic use. The specification applies to both wale and course directions where applicable. It explicitly excludes fabrics intended for contract, porch, deck, or lawn furniture, as well as woven, bonded, laminated, or surface-coated fabrics such as vinyls and urethanes.
The standard mandates that inch-pound units are regarded as standard, with SI units provided for informational purposes only. Users are responsible for establishing appropriate safety, health, and environmental practices, as noted in Section 6.4.1 and other relevant sections.
⚙️ Performance Requirements and Testing
This performance specification references numerous test methods to evaluate fabric properties. The table below lists the primary test methods cited for colorfastness and physical performance:
| 🟦 Test Method | 📏 Description | 🎯 Application |
|---|---|---|
| AATCC TM8 | Colorfastness to Crocking (Crockmeter Method) | Evaluates color transfer from fabric surface |
| AATCC TM16.2 | Colorfastness to Light (Carbon-Arc) | Measures resistance to fading under light exposure |
| AATCC TM23 | Colorfastness to Burnt Gas Fumes | Assesses resistance to fume fading |
| ASTM D4033 | Yarn Slippage at Sewn Seam (Dynamic Fatigue) | Determines seam strength under cyclic loading |
Additional tests include AATCC TM107 for colorfastness to water, TM129 for ozone, and TM116 for rotary vertical crocking. Evaluation of color change uses the Gray Scale (AATCC EP1), while staining is assessed via the Chromatic Transference Scale (AATCC EP8). Flammability requirements align with 16CFR Chapter II and optional UFAC or California Bulletin 1179 standards.
⚠️ Important Safety Consideration
Users must consult the standard for specific warnings, particularly in Section 6.4.1. Proper safety protocols should be followed during flammability and chemical testing to mitigate risks.
📊 Key Measured Properties
The following table summarizes essential properties evaluated under D4771-19 and their corresponding test methods:
| ⚡ Property | 📐 Test Method | 🟦 Standard Reference |
|---|---|---|
| Colorfastness to Crocking | AATCC TM8 or TM116 | AATCC Technical Manual |
| Colorfastness to Light | AATCC TM16.2 or TM16.3 | AATCC Technical Manual |
| Colorfastness to Water | AATCC TM107 | AATCC Technical Manual |
| Flammability | 16CFR Part 1610 | Federal Standard |
| Yarn Slippage | ASTM D4033 | ASTM Standards |
Note that ASTM D4033 has been withdrawn; users are encouraged to reference the latest available methods or the Joint Industry Knit Upholstery Fabric Standards and Guidelines for alternative procedures.
💡 Technical Tip
For colorfastness to light, the choice between carbon-arc (TM16.2) and xenon-arc (TM16.3) should align with the fabric’s end-use environment. Xenon-arc is generally preferred for simulating indoor lighting conditions.
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D4771-19?
It covers performance requirements for knitted upholstery fabrics used in new indoor furniture for general domestic use, excluding contract and outdoor furniture.
💡 Does this standard apply to woven or coated fabrics?
No, it is specifically for knitted fabrics. Woven, bonded, laminated, and surface-coated materials like vinyls are excluded.
⚡ Which colorfastness tests are referenced?
Key tests include AATCC TM8 (crocking), TM16.2/TM16.3 (light), TM23 (burnt gas fumes), and TM107 (water).
📌 What unit system is used in this standard?
Inch-pound units are standard, with SI units provided for reference only.