ASTM D2633-21 PDF

Full title and description

ASTM D2633-21 — Standard Test Methods for Thermoplastic Insulations and Jackets for Wire and Cable. This ASTM standard provides a consolidated set of test methods used to evaluate the physical, electrical, thermal, flammability, and water‑absorption properties of thermoplastic insulation and jacket materials applied to wire and cable assemblies (not including flexible cords).

Abstract

ASTM D2633-21 collects standardized test procedures for assessing performance characteristics of thermoplastic insulating and jacketing compounds when formed on wire or cable. Test areas include physical properties (tensile, elongation, thickness), electrical tests (insulation resistance, dielectric strength retention, partial discharge), accelerated water‑absorption, thermal and heat‑shock behavior, surface resistivity, track resistance, U‑bend discharge, and specified flammability tests. The methods are intended to determine the relevant material properties of the insulation or jacket and to provide consistent test practices for manufacturers, labs and specifiers.

General information

• Status: Published.
• Publication date: 2021-01-01 (Designated D2633-21 / published in the 2021 revision cycle).
• Publisher: ASTM International.
• ICS / categories: 29.035.20 — Plastics and rubber insulating materials / Electrical insulating materials.
• Edition / version: D2633-21 (revision of D2633-20).
• Number of pages: Approximately 13 pages (commercial listings report 13 pages; some archival references list close counts).

Scope

The standard covers procedures for testing thermoplastic insulations and jackets used on insulated wire and cable. Tests are intended to determine properties of the insulation or jacket material and do not apply to flexible cords or constructions having a separator between conductor and insulation for certain electrical and water‑absorption tests. Specific test method sections address physical tests, electrical tests, partial‑discharge extinction, accelerated water absorption, thermal tests, flammability (per referenced fire test methods), track resistance, surface resistivity, U‑bend discharge, and other relevant procedures. Users should consult product or material specifications to select which test methods apply.

Key topics and requirements

• Physical property tests: tensile strength, elongation, thickness, and dimensional checks for insulation/jackets.
• Electrical testing: insulation resistance, dielectric strength retention, voltage withstand and partial‑discharge extinction level measurements.
• Accelerated water‑absorption tests to assess moisture uptake in thermoplastic compounds used on conductor‑mounted constructions.
• Thermal and mechanical endurance tests: heat aging, heat distortion, heat shock, and cold‑bend assessments.
• Surface resistivity and track‑resistance testing for insulating surfaces.
• U‑bend discharge and partial‑discharge related methods for assessing discharge behavior on bent or damaged insulation.
• Flammability/vertical flame test references and requirements (test method cross‑references included in the standard).
• Notes on applicability: some electrical and water‑absorption tests are not applicable where a separator exists between conductor and insulation; product specifications determine which methods apply.

Typical use and users

Manufacturers of wire and cable, materials suppliers (thermoplastic compound producers), independent testing laboratories, specification writers, design and materials engineers, and regulatory/quality assurance personnel use D2633-21 to validate material performance, support product specifications, and ensure consistent test reporting between parties. The standard is used where insulation/jacket properties must be assessed on finished insulated or jacketed conductors.

Related standards

D2633-21 revises D2633-20 and is referenced by or used in conjunction with many other ASTM wire, cable and plastic test or specification documents (examples reported in commercial catalogs include D1047‑21, D6096‑21, D1248, D8354 and others). It is maintained by ASTM Committee D09 on Electrical and Electronic Insulating Materials (subcommittee D09.07). Users commonly cross‑reference the specific test methods and fire test procedures cited within D2633 when preparing product or procurement specifications.

Keywords

thermoplastic insulation, jacket, wire and cable, tensile strength, elongation, dielectric strength retention, insulation resistance, partial discharge extinction, water absorption (accelerated), heat shock, heat distortion, surface resistivity, track resistance, U‑bend discharge, vertical flame test.

FAQ

Q: What is this standard?

A: ASTM D2633-21 is a collection of standardized test methods for evaluating thermoplastic insulation and jacket materials applied to wire and cable. It provides procedures to measure a wide range of electrical, physical and thermal properties of the insulation/jacket when formed on conductor assemblies.

Q: What does it cover?

A: It covers physical tests (tensile, elongation, thickness), electrical tests (insulation resistance, dielectric retention, partial‑discharge extinction), accelerated water‑absorption, thermal and heat‑shock tests, surface resistivity, track resistance, U‑bend discharge and flammability methods or cross‑references. The standard clarifies applicability (for example, exclusions for flexible cords and certain constructions with separators).

Q: Who typically uses it?

A: Wire and cable manufacturers, materials suppliers, test laboratories, specification authors, and electrical/materials engineers use the standard for product development, acceptance testing, quality control, and procurement specifications.

Q: Is it current or superseded?

A: D2633‑21 is the 2021 revision (designation D2633-21) and replaces the prior D2633-20 edition. As published in the 2021 cycle it is the current ASTM revision unless a later revision or reapproval has been issued after the 2021 designation—users should verify the current status with ASTM or an authorized distributor before assuming it is the latest edition.

Q: Is it part of a series?

A: The standard is maintained under ASTM Committee D09 (Electrical and Electronic Insulating Materials) and sits alongside other ASTM specifications and test methods for polymeric wire/cable insulating materials. It is commonly used together with related ASTM specifications and methods cited in product standards and material specifications.

Q: What are the key keywords?

A: Thermoplastic insulation, jacket, water absorption, dielectric strength, insulation resistance, partial discharge, tensile, elongation, surface resistivity, track resistance, flammability.