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D1909-13 – Standard Test Method Technical Guide
📐 Scope and Significance
ASTM D1909-13 provides standardized tables for commercial moisture regains (CMR) and commercial allowances (CA) used for textile fibers. These values are primarily intended for determining commercial weight during buying and selling, calculating yarn linear density, and quantitative analysis of fiber blends. The standard emphasizes that these are defined values for commercial purposes, not experimental quantities, and are established by interested parties for consistency in textile commerce.
This standard is under the jurisdiction of ASTM Committee D13 on Textiles and is essential for ensuring uniformity in weight-based transactions and quality control across the industry.
⚙️ Commercial Moisture Regain and Allowance Tables
The standard includes two primary tables. Table 1 lists commercial moisture regain values for specified fibers, while Table 2 provides commercial allowance values with distinctions for filament yarn (FY) and spun fiber (SF), as clarified in the 2020 editorial update.
Table 1: Commercial Moisture Regain Values for Selected Fibers
| 🟦 Fiber Type | 📏 Moisture Regain (%) |
|---|---|
| Cotton | 7.5 |
| Wool | 13.6 |
| Silk | 11.0 |
| Rayon (Viscose) | 11.0 |
| Nylon | 4.5 |
| Polyester | 0.4 |
| Acrylic | 1.5 |
Table 2: Commercial Allowance Values for Filament Yarn and Spun Fiber
| 🟦 Fiber Type | 📐 Filament Yarn (FY) (%) | 🎯 Spun Fiber (SF) (%) |
|---|---|---|
| Cotton | 8.5 | 9.5 |
| Wool | 15.0 | 16.0 |
| Nylon | 5.5 | 6.5 |
Note: Values in these tables are defined for commercial transactions and may not reflect actual equilibrium moisture regains.
📊 Interpretation and Use
These values are critical for standardizing weight-based commerce. Commercial moisture regain is used to compute dry weight, while commercial allowance accounts for moisture content in traded materials. The standard stresses that these are not experimentally determined but defined for commercial convenience, and actual moisture regain can vary based on fiber history and finish content. Use these tables in conjunction with other ASTM standards like D2118 and D2494 for comprehensive quality assessment.
💡 Tip: Apply these values consistently in contracts to prevent disputes. Always verify the latest version of ASTM D1909 for current defined values.
⚡ Warning: Actual moisture regain may deviate from listed commercial values due to storage conditions or processing. Use defined values for all trade calculations to ensure fairness.
❓ Frequently Asked Questions
🔍 What is the purpose of commercial moisture regain values? They provide a standard basis for determining commercial weight of textile fibers and yarns, facilitating consistent pricing and quantitative analysis in trade and manufacturing.
💡 How are commercial allowances different from moisture regains? Commercial allowances are higher defined values used for purchasing by weight, accounting for excess moisture and finishing agents, while moisture regains are used for dry weight calculations.
⚡ Are these values experimentally determined? No, they are purely defined values agreed upon by industry parties for commercial convenience, not based on experimental equilibrium moisture content.
📌 Why is standard moisture content important in textile trade? It ensures uniformity in weight determination, reduces transaction disputes, and aligns with international practices for buying, selling, and testing textile materials.