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D2946-01 – Standard Test Method Technical Guide
ASTM D2946-01 (Reapproved 2018) establishes the official terminology for asbestos and asbestos–cement products. Managed by ASTM Committee C17 on Fiber-Reinforced Cement Products, this standard is fundamental for ensuring consistent communication regarding material identification, test methods, and product specifications across the industry. The terminology covers definitions and abbreviations that serve as the technical vocabulary for dozens of related standards.
📖 Scope and Definition Framework
The scope of D2946-01 covers all standard terminology, definitions, and abbreviations specifically related to asbestos and asbestos-cement products. It was developed in alignment with international standardization principles established by the World Trade Organization Technical Barriers to Trade (TBT) Committee. The precise definitions provided here form the linguistic foundation for interpreting the products, test methods, and safety practices referenced throughout the ASTM corpus.
🔬 Key Material and Engineering Definitions
The standard contains precise technical parameters essential for material science and field inspection. For example, actinolite asbestos is strictly defined as an asbestiform variety of the monoclinic amphibole silicate minerals, with the empirical formula Ca₂(Mg,Fe²⁺)₅Si₈O₂₂(OH)₂ and a Chemical Abstracts number of 77536-66-4. Furthermore, the standard defines the Aggressivity Index as a specific measure of the corrosiveness of water toward asbestos-cement, a critical calculation for engineers evaluating pipe durability and water chemistry interactions.
| 🟦 📖 Term | 📐 ⚡ Definition / Technical Detail |
|---|---|
| Accessible Bag | For sampling, a bag in a pile of asbestos fiber where at least one side or one end is fully exposed. |
| Accessible Surface | A side of a pile of asbestos fiber bags in which all the bags are accessible bags. |
| Accessories | Subordinate materials such as fasteners, couplings, gaskets, and closure strips necessary for proper application of primary asbestos-cement products. |
| Actinolite Asbestos | Asbestiform monoclinic amphibole silicate. Formula: Ca₂(Mg,Fe²⁺)₅Si₈O₂₂(OH)₂. CAS: 77536-66-4. |
| Aggressivity Index | A specific measure of the corrosiveness of water toward asbestos-cement, defined by a documented mathematical formula within the standard. |
📚 Comprehensive Referenced Standards Network
The terminology in D2946-01 supports a vast network of related ASTM documents. These range from product specifications like C296 (Asbestos-Cement Pressure Pipe) and C428 (Nonpressure Sewer Pipe) to critical test methods such as D1918 (Asbestos Content of Textiles), D1118 (Magnetic Rating), and D2589 (McNett Wet Classification). This correlation ensures that the language defining test conditions matches the language defining product requirements.
| 🎯 Standard | 🔬 Product or Test Application |
|---|---|
| C296 | Specification for Asbestos-Cement Pressure Pipe |
| C428 | Specification for Asbestos-Cement Nonpressure Sewer Pipe |
| C458 | Test Method for Organic Fiber Content of Asbestos-Cement Products |
| C500 | Test Methods for Asbestos-Cement Pipe |
| D2589 | Test Method for McNett Wet Classification of Dual Asbestos Fiber |
| D1918 | Test Method for Asbestos Content of Asbestos Textiles |
🔍 Technical Tip: Definitions within D2946-01 often rely on explicit cross-referencing. For instance, the definition for “adhesion” states simply “for asbestos, see fiber adhesion.” Practitioners should review the entire chain of definitions and the referenced test methods to achieve full technical clarity for compliance and reporting.
⚠️ Important Notice: Several referenced standards in D2946-01 have since been withdrawn, including D3879 (Sampling Amphibole Asbestos) and E849 (Safety Practices for Occupational Asbestos Exposure). Always verify the current active status and most recent editions of these documents before applying