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D3690-19 – Standard Test Method Technical Guide
ASTM D3690-19 establishes the standard performance requirements for vinyl-coated and urethane-coated upholstery fabrics intended for use in indoor furniture. This specification applies to fabrics constructed with woven, knit, or nonwoven substrates, providing a critical benchmark for quality and durability in the residential and contract furniture industries.
📐 Scope and Industry Applicability
This performance specification provides a comprehensive set of requirements designed to ensure a minimum quality and durability level for coated upholstery materials. It is critical to note that these requirements are specifically tailored for the demanding environment of indoor furniture applications. The standard applies to the length and width directions for those properties where fabric direction is pertinent.
⚠️ Excluded Applications: The standard explicitly does not cover fabrics used in porch, deck, or lawn furniture. Furthermore, plain knit fabrics and plain, tufted, or flocked woven fabrics are excluded from this specification, as they fall under different performance benchmarks and testing protocols.
⚙️ Referenced Test Methods and Performance Parameters
To ensure consistent and reproducible evaluation, this specification relies on a series of standardized ASTM, AATCC, and CFFA test methods. The table below outlines the core properties evaluated and the specific test methods employed for compliance.
| 🟦 Property | 📏 Test Method | 🎯 Significance |
|---|---|---|
| Breaking Strength | ASTM D5034 (Grab Test) | Measures the tensile force required to rupture the fabric, ensuring it can withstand seam stresses during construction and use. |
| Abrasion Resistance | ASTM D4157 (Oscillatory Cylinder Method) | Evaluates the durability of the fabric surface against repetitive wear and rubbing. |
| Blocking | CFFA-5 | Assesses the tendency of the coated surface to develop tack or stick to itself under heat and pressure. |
| Tearing Strength | CFFA-20 (Tongue Method) | Determines resistance to tear propagation, a critical factor in seam integrity and long-term durability. |
| Low-Temperature Bend | ASTM D2136 | Tests the resistance of the coating to cracking or delamination when flexed at cold temperatures. |
| Volatile Loss | ASTM D1203 (Activated Carbon Methods) | Measures the loss of plasticizers or other volatile components that can lead to stiffening or cracking of the coating over time. |
| Colorfastness to Light | AATCC TM16.3 / AATCC EP1 (Gray Scale) | Rates the resistance of the fabric color to fading when exposed to Xenon-Arc light sources. |
| Colorfastness to Crocking | AATCC TM8 / TM116 / AATCC EP8 (Chromatic Transference Scale) | Evaluates the transfer of color from the fabric surface to other materials through rubbing, using either a standard or rotary vertical crockmeter. |
💡 Testing Note: Performance requirements apply to both the length and width directions for properties where fabric orientation is pertinent. Always verify that the latest edition of each referenced standard is being used for compliance testing.
📊 Understanding Key Terminology
The precise definitions provided in D3690-19 ensure clarity when interpreting test results. Three terms are particularly important for understanding material behavior and end-use performance:
- Blocking: Defined specifically as the measurement of the development of surface tack and the thermal softening point of the material.
- Hydrolytic Stability: The ability of the coated fabric to withstand the environmental effects of high humidity without degrading.
- Tack Tear: The measurement of a coated fabric’s resistance to tearing under the specific stress conditions of being tacked in place during installation.
❓ Frequently Asked Questions
🔍 What types of products must comply with this standard?
Any new indoor furniture utilizing vinyl-coated or urethane-coated upholstery fabrics produced with woven, knit, or nonwoven substrates can be specified to this standard. It serves as a universal benchmark for manufacturers, retailers, and specifiers to ensure consistent quality.
💡 Does this standard apply to outdoor furniture fabrics?
No. D3690-19 is strictly for indoor applications. The scope explicitly excludes fabrics intended for porch, deck, or lawn furniture, which are exposed to significantly different environmental stresses such as UV radiation and moisture.
⚡ What is the difference between AATCC TM8 and TM116 for crocking?
AATCC TM8 uses a standard (linear reciprocal) Crockmeter, while TM116 employs a Rotary Vertical Crockmeter. The appropriate method is selected based on the fabric structure and the type of rubbing action that a specific end-use application requires.
📌 What does the term “tack tear” specifically refer to?
Tack tear is a unique property defined in this standard. It measures the resistance of a coated fabric to tearing when subjected to stresses similar to those encountered when the fabric is stretched over furniture frames and secured with tacks or staples.