简介

ASTM  D470-99是交联绝缘材料和电线\电缆外皮的老化测试标准。标准后续的数字指代标准的采用年限，或者修订情况下最后确定修改的年份。

1. Scope

1.1 These test methods cover procedures for testing crosslinked insulations and jackets for wire and cable. To determine the test to be made on the particular insulation or jacket, reference should be made to the product specification for that type. These test methods do not apply to the class of products known as flexible cords.

1.2 This standard does not purport to address all of the safety problems, 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 specific hazards see Section 4.

1.3 Whenever two sets of values are presented, in different units, the values in the first set are the standard, while those in the parentheses are for information only.

1.4 In many instances the insulation or jacket cannot be tested unless it has been formed around a conductor or cable. Therefore, tests are done on insulated or jacketed wire or cable in these test methods solely to determine the relevant property of the insulation or jacket and not to test the conductor or completed cable.

1.5 The procedures appear in the following sections:

2. Referenced Documents

2.1 ASTM Standards: D 149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies2

D 150 Test Methods for AC Loss Characteristics and Permittivity (Dielectric Constant) of Solid Electrical Insulating Materials2

D 257 Test Methods for D-C Resistance or Conductance of Insulating Materials2

D 412 Test Methods for Vulcanized Rubber and Thermoplastic Rubbers and Thermostatic Elastomers—Tension3

D 454 Test Method for Rubber Deterioration by Heat and Air Pressure3

D 572 Test Method for Rubber Deterioration by Heat and Oxygen3

D 573 Test Method for Rubber—Deterioration in an Air Oven3

D 1193 Specification for Reagent Water4

D 1711 Terminology Relating to Electrical Insulation2

D 2132 Test Method for Dust-and-Fog Tracking and Erosion Resistance of Electrical Insulating Materials2

D 3755 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials Under Direct-Voltage Stress5

D 5025 Specification for a Laboratory Burner Used for Small-Scale Burning Tests on Plastic Materials6

D 5207 Practice for Calibration of 20 and 125 mm Test Flames for Small-Scale Burning Tests on Plastic Materials6 D 5423 Specification for Forced-Convection Laboratory Ovens for Evaluation of Electrical Insulation

2.2 ICEA Standard:

T-24-380 Guide for Partial-Discharge Procedure7

3. Terminology

3.1 Definitions—For definitions of terms used in these test methods, refer to Terminology D 1711.

3.2 Definition of Term Specific to this Standard:

3.2.1 aging (act of), n—exposure of material to air or oil at a temperature and time as specified in the relevant material specification for that material.

3.3 Symbol:

3.3.1 kcmil—thousands of circular mils.