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D349-13 – Standard Test Method Technical Guide
📐 Scope and Specimen Selection
ASTM D349-13 covers standard test methods for rigid round rods used in electrical insulation. These rods are made from fibrous sheets such as cellulose, glass, or nylon in the form of paper, woven fabrics, or mats, bonded with natural or synthetic resins. The standard includes vulcanized fiber, thermosetting laminates, and rods from cast, molded, or extruded resins with or without fillers.
Test specimens should be selected from material free of obvious defects unless the purpose is to evaluate the effects of such defects.
⚙️ Conditioning and Test Procedures
Conditioning is specified to eliminate the effects of humidity history. For tensile, flexural, compressive strengths, and density, condition machined specimens per Procedure B of Practice D6054 and test at 23 ± 5°C. Note that complete equilibrium may require 20 to 100 days depending on material thickness and type.
| 🟦 Test Method | 📏 Sections |
|---|---|
| Compressive strength (axial) | 20 – 25 |
| Density | 28 – 30 |
| Dielectric strength | 31 – 39 |
| Flexural strength | 13 – 19 |
| Tensile strength | 7 – 12 |
| Water absorption | 26-27 |
Conditioning per Procedure B of D6054 ensures reproducible results. Test all specimens at 23 ± 5°C for tensile, flexural, compressive, and density measurements.
📊 Key Measured Properties and Standards
The standard outlines six key test methods, each detailed in designated sections. Supporting standards include D149 for dielectric breakdown, D570 for water absorption, D668 for dimensional measurement, D792 for density, D1711 for terminology, and D6054 for conditioning. Values are reported in inch-pound units.
| 📐 Standard | Description |
|---|---|
| D149 | Dielectric Breakdown Voltage and Dielectric Strength |
| D570 | Water Absorption of Plastics |
| D668 | Measuring Dimensions of Rigid Rods and Tubes |
| D792 | Density and Specific Gravity by Displacement |
| D1711 | Terminology Relating to Electrical Insulation |
| D6054 | Conditioning Electrical Insulating Materials (Withdrawn 2012) |
Refer to section 36.2 for specific safety warnings. Users are responsible for establishing safety and health practices before use.
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D349-13?
It covers test procedures for rigid round rods used in electrical insulation, including various materials like vulcanized fiber and laminates.
💡 How should specimens be conditioned?
Condition machined specimens per Procedure B of Practice D6054 for tensile, flexural, compressive strengths, and density. Test at 23 ± 5°C.
⚡ What test methods are included in this standard?
The standard includes compressive strength (axial), density, dielectric strength, flexural strength, tensile strength, and water absorption.
📌 What are the key referenced documents?
Key references include ASTM D149, D570, D668, D792, D1711, and D6054.