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D1118 – Standard Test Method Technical Guide
The ASTM D1118/D1118M standard (reapproved 2017) specifies a test method for the magnetic rating of asbestos fiber and asbestos textile products. This method is primarily used for testing asbestos insulating materials. The standard emphasizes that values in SI or inch-pound units are to be regarded separately, as they may not be exact equivalents.
📐 Scope and Terminology
The test method covers the determination of magnetic rating for asbestos fiber and textile products. Key terms defined in the standard include:
| 🟦 Term | 📏 Definition |
|---|---|
| Asbestos Fiber | The hydrous magnesium silicate serpentine mineral chrysotile, Mg₃Si₂O₅(OH)₄. |
| Atmosphere for Testing Textiles | Air at 50 ± 2 % relative humidity and 70 ± 2 °F [21 ± 1 °C]. |
| Magnetic Rating (MR) | An empirical value reflecting the effect of magnetic particles, as measured by a magnetic effect analyzer. Not quantitative. |
The standard refers to Terminology D123 and D2946 for additional textile and asbestos terms.
⚙️ Test Method and Conditions
The test uses a magnetic effect analyzer, with drawings available as ASTM adjuncts. Testing must be performed in a controlled atmosphere. The following table summarizes the environmental conditions:
| ⚙️ Parameter | 📐 Value |
|---|---|
| Relative Humidity | 50 ± 2 % |
| Temperature | 70 ± 2 °F [21 ± 1 °C] |
Referenced documents include standards such as D123, D2100, D2590, D2947, and E11. The standard emphasizes independent use of SI or inch-pound units and health precautions.
⚠️ Health Warning: Breathing of asbestos dust is hazardous. Minimize dust during use and follow safety guidelines from the “Safe Use of Chrysotile Asbestos” manual.
💡 Technical Note: The magnetic rating (MR) is an empirical indicator, not a quantitative measure of magnetic particles. Ensure unit systems are used independently.
❓ Frequently Asked Questions
🔍 What is the scope of D1118/D1118M? It covers the determination of magnetic rating for asbestos fiber and textile products, primarily for insulating materials.
💡 How is the testing atmosphere defined? As air at 50 ± 2% relative humidity and 70 ± 2°F [21 ± 1°C].
⚡ What apparatus is used? A magnetic effect analyzer, with design details in ASTM adjuncts.
📌 What are the health precautions? Avoid breathing asbestos dust and refer to safety manuals for proper handling.