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D3994-22 – Standard Test Method Technical Guide
📊 Mechanical and Physical Specifications
This specification covers woven fabrics for swimwear. Fabrics must meet the following mechanical and physical properties to ensure durability and performance.
| 🟦 Property | 📏 Requirement | 🎯 Test Method |
|---|---|---|
| Breaking Strength (Grab) | ≥ 30 lbf (warp & fill) | ASTM D5034 |
| Tearing Strength (Elmendorf) | ≥ 10 lbf (warp & fill) | ASTM D1424 |
| Dimensional Change (After 3 washes) | ≤ ±3% (warp & fill) | AATCC TM135 |
| Resistance to Yarn Slippage | ≤ 1/8 in seam opening | ASTM D434 |
🔬 Colorfastness Specifications
Colorfastness requirements ensure that fabrics retain color during use. The following minimum grades apply when tested according to AATCC methods.
| 🟦 Exposure Condition | 📏 Minimum Grade | 🎯 Test Method |
|---|---|---|
| Light (80 hours) | ≥ 4 | AATCC TM16.3 |
| Perspiration (staining) | ≥ 4 | AATCC TM15 |
| Sea Water | ≥ 3 | AATCC TM106 |
| Chlorinated Pool Water | ≥ 3 | AATCC TM162 |
| Home Laundering | ≥ 4 | AATCC TM61 |
⚙️ Testing Considerations and Compliance
All testing must be performed on conditioned specimens in accordance with ASTM practices. Safety hazards caveat applies when conducting tests.
🔴 Note: Some referenced methods like ASTM D434 (yarn slippage) are withdrawn but remain part of the standard for historical reference.
💡 For accurate colorfastness results, ensure exposure conditions match AATCC requirements, particularly for chlorinated pool testing.
❓ Frequently Asked Questions
🔍 Why is colorfastness to chlorinated pool water important?
Swimwear is frequently exposed to chlorinated pools, which can cause rapid fading. The standard requires a minimum grade of 3 per AATCC TM162 to ensure acceptable performance.
⚡ What is the minimum breaking strength required?
Breaking strength must be at least 30 lbf in both warp and fill directions when tested using ASTM D5034 to prevent seam failure and fabric tear during use.
📌 How is dimensional change evaluated in these fabrics?
Dimensional change is measured after three home laundering cycles using AATCC TM135. The allowable change is ±3% maximum in both warp and fill directions.
💡 What distinguishes ASTM D3994 from other woven fabric standards?
D3994 specifically applies to woven swimwear fabrics with emphasis on colorfastness to chlorinated and sea water, unlike general apparel standards.