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D1574-22 – Standard Test Method Technical Guide
📋 Overview of D1574-22
ASTM D1574-22 defines a standardized test method for determining extractable matter in wool and other animal fibers, excluding grease wool. It uses a non-flammable halogenated hydrocarbon solvent in a Soxhlet apparatus. The method is widely used for acceptance testing of commercial textile shipments.
The scope covers all wool forms and animal fibers but does not cover the identification of specific components within the extract. Values are reported in SI units. Users must review safety precautions (Section 5.4, Note 3) regarding halogenated solvents.
⚠️ Safety Note: D1574-22 does not address all safety concerns. Users must establish appropriate safety, health, and environmental practices per section 5.4 and Note 3.
⚙️ Test Procedure and Key Details
The specimen is extracted in a Soxhlet apparatus using a specified halogenated hydrocarbon solvent. The solvent is filtered and evaporated. Both the extracted specimen residue and the extracted matter are dried and weighed. The result is calculated as a percentage of the oven-dry mass of the wool specimen (dried specimen + dried extract). Special procedures correct for volatile components.
| 🔧 Parameter | 📏 Specification |
|---|---|
| Apparatus | Soxhlet extraction apparatus |
| Solvent | Non-flammable halogenated hydrocarbon |
| Calculation Base | Oven-dry mass (specimen + extract) |
| Applicable Materials | Wool (excl. grease wool), animal fibers |
📊 Significance and Referenced Standards
D1574-22 is standard for acceptance testing in the wool trade. In a dispute, the purchaser and supplier must conduct comparative tests on homogeneous samples to identify statistical bias. The method works with standards like D4845 (Terminology) and D2257 (Extractable Matter in Textiles).
💡 Best Practice: D1574-22 is often used with D584 for laboratory-scale wool content or D2257 for yarns and felts. Strict adherence to oven-drying and solvent handling is essential for consistent results.
| 📚 Reference Standard | 🎯 Purpose |
|---|---|
| D123 | Terminology Relating to Textiles |
| D584 | Wool Content of Raw Wool (Lab Scale) |
| D2257 | Extractable Matter in Textiles (Yarns) |
| D4845 | Terminology Relating to Wool |
❓ Frequently Asked Questions
🔍 What materials are covered under D1574-22?
The test method covers all forms of wool, except grease wool, and other animal fibers.
💡 What solvent does the method specify?
A non-flammable halogenated hydrocarbon solvent, used in a Soxhlet apparatus.
⚡ How is the result expressed?
As a percentage of the oven-dry mass of the wool specimen (dried extracted specimen + dried extracted material).
📌 How is a dispute resolved under this method?
The purchaser and supplier must conduct comparative tests on homogeneous samples to check for statistical bias.