ASTM D7238-20 PDF
Name in English:
St ASTM D7238-20
Name in Russian:
Ст ASTM D7238-20
Original standard ASTM D7238-20 in PDF full version. Additional info + preview on request
Full title and description
St ASTM D7238-20 — Standard Test Method for Determination of High-Temperature Short-Term Thermal Exposure (Thermal Aging) of Polyolefin Insulated Wire and Cable Using a Forced-Air Oven. This ASTM standard specifies procedures for the short-term thermal exposure of polyolefin insulated wire and cable in a forced-air oven to assess effects of high-temperature aging on physical and electrical properties.
Abstract
ASTM D7238-20 describes a controlled laboratory procedure to thermally age polyolefin-insulated wire and cable at elevated temperatures for relatively short periods using a forced-air oven. The method provides a reproducible way to simulate thermal exposure, enabling evaluation of changes in properties such as elongation, tensile strength, insulation resistance, and appearance. Results help predict material performance under high-temperature service or during accelerated life testing.
General information
- Status: Current (as of 2020 revision)
- Publication date: 2020
- Publisher: ASTM International
- ICS / categories: 71.060.10 (Electrical insulation), 43.020 (Plastics)
- Edition / version: D7238-20
- Number of pages: Typically 6–10 pages (standard test method document length)
Scope
This standard covers short‑term thermal exposure (thermal aging) of polyolefin insulated wire and cable in a forced-air oven. It provides procedures for selecting temperatures and exposure durations to produce meaningful changes in material properties without introducing unusual decomposition modes. The method is intended for use with polyolefin base insulation and may be applied prior to subsequent electrical or mechanical testing to evaluate aging effects.
Key topics and requirements
- Apparatus: forced-air circulating oven with temperature control and monitoring.
- Specimen preparation: representative lengths of insulated wire or cable, conditioning before exposure.
- Temperature selection and control: defined temperatures and tolerances, recommended ranges for polyolefins.
- Exposure times: short-term durations defined to produce measurable property changes without extensive decomposition.
- Post‑exposure evaluation: mechanical and electrical tests (e.g., tensile, elongation, insulation resistance), and visual examination.
- Reporting: test conditions, specimen identification, pre- and post-exposure test results, and any deviations from the method.
Typical use and users
Used by materials engineers, cable manufacturers, test laboratories, quality assurance personnel, and R&D groups to assess thermal stability and short‑term aging behavior of polyolefin insulated wire and cable. Typical applications include product development, comparative aging studies, qualification testing, troubleshooting failures, and verifying compliance with customer or regulatory requirements.
Related standards
Commonly referenced or complementary standards include other ASTM wire and cable thermal and aging tests, electrical insulation test methods, and material property standards for polyolefins. Examples include ASTM D2303 (thermal aging of elastomeric insulating material), ASTM D2302, and industry wire/cable specification standards that require thermal aging preconditioning prior to electrical or mechanical tests.
Keywords
ASTM D7238-20, thermal aging, forced-air oven, polyolefin, insulated wire, cable, short-term exposure, accelerated aging, insulation testing, material stability
FAQ
Q: What is this standard?
A: It is ASTM D7238-20, a test method for short-term high-temperature thermal exposure (aging) of polyolefin insulated wire and cable using a forced-air oven.
Q: What does it cover?
A: It covers specimen preparation, oven and temperature control requirements, exposure durations, and post-exposure evaluations to assess changes in physical and electrical properties of polyolefin insulation after thermal exposure.
Q: Who typically uses it?
A: Materials and test engineers, cable and wire manufacturers, independent test laboratories, and quality assurance teams use it for development, qualification, and comparative aging studies.
Q: Is it current or superseded?
A: The version referenced is D7238-20 (2020). Users should confirm whether a more recent revision exists before use.
Q: Is it part of a series?
A: It is part of ASTM's suite of test methods for electrical insulation and wire and cable materials; related ASTM methods address other aging conditions and material property determinations.
Q: What are the key keywords?
A: Thermal aging, forced-air oven, polyolefin, insulated wire, cable testing, accelerated aging, D7238-20.