ASTM D2671 - 21
Standard Test Methods for Heat-Shrinkable Tubing for Electrical Use
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Significance and Use
4.1 These test methods include most of the important tests used to characterize heat-shrinkable tubing. They are intended primarily for, but not limited to, extruded heat-shrinkable tubing.
4.2 It is acceptable to use variations in these test methods or alternate contemporary methods of measurement to determine the values for the properties in this standard provided such methods ensure quality levels and measurement accuracy equal to or better than those prescribed herein. It is the responsibility of the organizations using alternate test methods to be able to demonstrate this condition. In cases of dispute, the methods specified herein shall be used.
Note 2: Provision for alternate methods is necessary because of (1) the desire to simplify procedures for specific applications without altering the result, and (2) the desire to eliminate redundant testing and use data generated during manufacturing process control, including that generated under Statistical Process Control (SPC) conditions, using equipment and methods other than those specified herein. An example would be the use of laser micrometers or optical comparators to measure dimensions.
1. Scope
1.1 These test methods cover the testing of heat-shrinkable tubing used for electrical insulation. Materials used include poly(vinyl chloride), polyolefins, fluorocarbon polymers, silicone rubber, and other plastic or elastomeric compounds.
1.2 These test methods appear in the following sections:
| Procedure | Section(s) | Test |
| Adhesive Peel Strength | 94 – 100 |
|
| Brittleness Temperature | 40 | D746 |
| Color | 55 and 56 | D1535 |
| Color Stability | 57 – 62 | D1535 |
| Conditioning | 7 | D618 |
| Copper Stability | 89 |
|
| Corrosion Testing | 85 – 91 |
|
| Dielectric Breakdown | 20 – 25 | D149 |
| Dimensions | 8 – 13 | D876 |
| Flammability | 68 | D8355 |
| Fluid Resistance | 63 – 67 |
|
| Fungus Resistance | 100 – 104 |
|
| Heat Resistance | 49 – 54 |
|
| Heat Shock | 26 – 30 |
|
| Low-temperature Properties | 36 – 43 |
|
| Restricted Shrinkage | 14 – 19 |
|
| Selection of Test Specimens | 6 |
|
| Secant Modulus | 77 – 80 | D882 |
| Storage Life | 31 – 35 |
|
| Specific Gravity | 69 and 70 | D792 |
| Stress Modulus | 81 – 84 | D412 |
| Tensile Strength and Ultimate Elongation | 44 – 48 | D412 |
| Thermal Endurance | 92 and 93 |
|
| Volume Resistivity | 71 – 74 | D257 |
| Water Absorption | 75 and 76 | D570 |
| Melting Point | 100 – 104 | D3418 |
1.3 The values stated in inch-pound units are to be regarded as standard, except for temperature, which shall be expressed in degrees Celsius. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 5 and for fire test safety caveats see Test Methods D8355.
Note 1: These test methods are similar, but not identical to, those in IEC 60684-2 (see also Note 9).
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies
D257 Test Methods for DC Resistance or Conductance of Insulating Materials
D412 Test Methods for Vulcanized Rubber and Thermoplastic ElastomersTension
D570 Test Method for Water Absorption of Plastics
D618 Practice for Conditioning Plastics for Testing
D746 Test Method for Brittleness Temperature of Plastics and Elastomers by Impact
D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
D876 Test Methods for Nonrigid Vinyl Chloride Polymer Tubing Used for Electrical Insulation
D882 Test Method for Tensile Properties of Thin Plastic Sheeting
D1535 Practice for Specifying Color by the Munsell System
D1711 Terminology Relating to Electrical Insulation
D3418 Test Method for Transition Temperatures and Enthalpies of Fusion and Crystallization of Polymers by Differential Scanning Calorimetry
D8355 Test Methods for Flammability of Electrical Insulating Materials Used for Sleeving or Tubing
E176 Terminology of Fire Standards
ICS Code
ICS Number Code 29.120.99 (Other electrical accessories)
Referencing This Standard
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DOI: 10.1520/D2671-21
Citation Format
ASTM D2671-21, Standard Test Methods for Heat-Shrinkable Tubing for Electrical Use, ASTM International, West Conshohocken, PA, 2021, www.astm.org
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