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D1282-18 – Standard Test Method Technical Guide
ASTM D1282-18 provides a standard test method for estimating the average fiber diameter of wool fibers using airflow resistance. It is applicable to non-medullated, carded wool and wool top, as well as grease and scoured wool prepared per Test Method D2130. The method utilizes the Port-Ar and WIRA Fiber Fineness Meter instruments, which operate on the air-flow principle.
📐 Overview and Scope
This test method covers the estimation of average fiber diameter of wool fibers via the Port-Ar and WIRA Fiber Fineness Meter. It is directly applicable to non-medullated, carded wool and wool top. For grease wool and scoured wool, samples must be prepared as directed in Test Method D2130. The method is not recommended for acceptance testing but serves as a fast quality control check.
⚙️ Test Procedure and Instrumentation
The resistance to airflow of a predetermined mass of wool compressed to a fixed volume is measured. The instruments are calibrated to read average diameter in micrometres. Specimens of wool top are rated with a Wool Top Scale, while carded, scoured wool and scoured ½-in. cores are rated with a Scoured Wool Scale. Proper calibration ensures interchangeable results between instruments.
📊 Key Measured Properties and Calibration
The key measured property is the average fiber diameter in micrometres derived from airflow resistance. The instruments must be calibrated using the appropriate scale for the material type. The following table summarizes the instrument-scale associations:
| 🛠 Instrument | 📏 Scale | 🧪 Application |
|---|---|---|
| Port-Ar | Wool Top Scale | Wool top specimens |
| WIRA Fiber Fineness Meter | Scoured Wool Scale | Carded, scoured wool and scoured ½-in. cores |
Results from properly calibrated instruments are interchangeable.
⚠️ This test method is not recommended for acceptance testing of commercial shipments. For referee purposes, use Test Method D2130.
💡 Note: The Micronaire instrument is used for measuring cotton fiber fineness as per Test Method D1448.
❓ Frequently Asked Questions
🔍 Is this test method recommended for acceptance testing of commercial shipments?
No, it is not recommended. The referee method for acceptance testing is Test Method D2130.
💡 Which instruments are approved for use in this test method?
The approved instruments are the Port-Ar and the WIRA Fiber Fineness Meter.
⚡ What is the principle of the air-flow test method?
The resistance to airflow of a predetermined mass of wool compressed to a fixed volume is measured.
📌 What types of wool materials are directly applicable?
Non-medullated, carded wool and wool top are directly applicable. Grease wool and scoured wool require preparation per Test Method D2130.