ASTM D348 Standard Test Methods for Rigid Tubes Used for Electrical Insulation
ASTM D348电气绝缘使用刚性管标准试验方法
Tension tests, properly interpreted, provide information with regard to the tensile properties of rigid tubing, when employed under conditions approximating those under which the tests are made. The tensile strength values may vary with the size of the tube and with the temperature and atmospheric conditions. Tension tests may provide data for research and development and for engineering design, and are useful for quality control purposes.
1. Scope
1.1 These test methods cover the testing of rigid tubes used in electrical insulation. These tubes include many types made from fibrous sheets of basic materials, such as cellulose, glass, or nylon, in the form of paper, woven fabrics, or mats, bonded together by natural or synthetic resins or by adhesives. Such tubes include vulcanized fiber and thermosetting laminates, as well as tubes made from cast, molded, or extruded natural or synthetic resins, with or without fillers or reinforcing materials.
1.2 Tubes tested by these test methods are most commonly circular in cross section; however, noncircular shapes are also in commercial use. To the extent that the individual methods are compatible with a particular noncircular shape, these test methods are applicable to these other shapes. For tests on noncircular tubes, appropriate comments should be included in the test report, including details of orientation of test specimens with respect to the cross section of the tube.
1.3 The procedures appear in the following sections:
1.4 The values stated in inch-pound units are to be regarded as the standard. SI units in parentheses are for information only.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For a specific hazard statement, see 27.1.1.
2. Referenced Documents (purchase separately)
ASTM Standards
D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies
D150 Test Methods for AC Loss Characteristics and Permittivity (Dielectric Constant) of Solid Electrical Insulation
D570 Test Method for Water Absorption of Plastics
D668 Test Methods of Measuring Dimensions of Rigid Rods and Tubes Used for Electrical Insulation
D1711 Terminology Relating to Electrical Insulation
E4 Practices for Force Verification of Testing Machines
D150 Test Methods for AC Loss Characteristics and Permittivity (Dielectric Constant) of Solid Electrical Insulation
D570 Test Method for Water Absorption of Plastics
D668 Test Methods of Measuring Dimensions of Rigid Rods and Tubes Used for Electrical Insulation
D1711 Terminology Relating to Electrical Insulation
E4 Practices for Force Verification of Testing Machines
Index Terms
compressive strength; density; dielectric strength; dissipation factor; permittivity; rigid tubes; tensile strength; thermosetting laminate; vulcanized fibre; water absorption;