ASTM D649-42T PDF

Full title and description

St ASTM D649-42T — Tentative Method of Test for Compressive Strength of Electrical Insulating Materials. This is a historic, tentative ASTM test method issued in 1942 to describe a procedure for determining the compressive strength of materials used as electrical insulators.

Abstract

ASTM D649-42T is a short, tentative test method published in 1942 that provided procedural guidance for measuring compressive strength of electrical insulating materials. The document is an early/inactive ASTM method and has been withdrawn or superseded in later ASTM program reorganizations. The original item is brief (two pages in available catalog records) and intended for laboratory evaluation of compression properties of insulating materials.

General information

• Status: Inactive / withdrawn (historic tentative method).
• Publication date: 1942 (designation shown as D649-42T / January 1, 1942 in catalog listings).
• Publisher: ASTM (ASTM International).
• ICS / categories: Materials testing; electrical insulating materials; mechanical (compressive) test methods.
• Edition / version: D649-42T (tentative edition, 1942).
• Number of pages: 2 (catalog record indicates a very short, 2-page tentative method).

Scope

The standard gave a tentative laboratory procedure for determining the compressive strength of electrical insulating materials. As a tentative method it focused on establishing a repeatable compression test for insulators rather than providing an extensive annex of specimen types or materials classifications. The item is archival and not used for current compliance; later, more comprehensive ASTM methods address compressive testing for related material classes.

Key topics and requirements

• Tentative method for compressive strength testing of electrical insulating materials (purpose and basic test intent).
• Short procedural outline suitable for laboratory application (specimen placement between platens, measurement of load at failure or specified deformation).
• Historic/archival status — limited scope and later supersession by broader compressive test standards.
• Relevant to development of later compressive test practice for plastics and insulating materials (see successor standards for modern methods).

Typical use and users

Primary users historically included materials laboratories, manufacturers of electrical insulating materials, and research groups investigating compressive behaviour of insulators. Today the document is of interest mainly to standards historians, archival researchers, and organizations tracing the evolution of compressive test methods; modern testing follows current ASTM methods (for example, D695 for compressive properties of rigid plastics) or other material-specific standards.

Related standards

ASTM D649-42T is an early, tentative item that has been superseded in practice by later, broader compressive test methods. Document records indicate that D649 was discontinued and users were directed to use ASTM D695 (Standard Test Method for Compressive Properties of Rigid Plastics) as the relevant, refreshed test method framework for many compressive-property applications. D695 is also technically aligned with ISO 604 for compressive testing of plastics.

Keywords

ASTM D649-42T, compressive strength, electrical insulating materials, tentative method, historic ASTM, compressive test, material testing.

FAQ

Q: What is this standard?

A: ASTM D649-42T is a tentative (1942) ASTM test method that described a laboratory procedure for determining the compressive strength of electrical insulating materials. It is a short, historic document rather than a current normative test method.

Q: What does it cover?

A: It covers a tentative procedure for compression testing of electrical insulating materials — essentially how to load specimens in compression and record compressive strength or deformation under load. The original is concise and intended as an initial, provisional method.

Q: Who typically uses it?

A: Historically, materials test laboratories and manufacturers of insulating materials used it; presently it is primarily of archival or historical interest. Modern testing for similar properties uses current ASTM methods and material-specific standards.

Q: Is it current or superseded?

A: It is not current. Catalog records list D649 as inactive/withdrawn; users have been directed to later standards (for example ASTM D695) for modern compressive testing approaches.

Q: Is it part of a series?

A: D649-42T was a standalone tentative method from 1942 rather than part of a continuing series. Over time its subject matter has been incorporated into broader compressive-testing standards (notably D695 for plastics and related materials).

Q: What are the key keywords?

A: Compressive strength; electrical insulating materials; ASTM; tentative method; D649-42T; compression test; material properties.