ASTM D543-21 PDF

Full title and description

ASTM D543-21 — Standard Practices for Evaluating the Resistance of Plastics to Chemical Reagents. This practice provides standardized procedures (immersion and stressed-exposure methods) and reporting conventions to assess the effects of chemical reagents on plastics, including changes in weight, dimensions, appearance, color, strength, and other mechanical properties to support material selection and quality evaluation.

Abstract

ASTM D543-21 defines test practices for evaluating how polymeric materials resist chemical attack. It presents two variants of an immersion procedure (Practice A) and one stressed-exposure procedure (Practice B) to measure property changes after exposure to specified reagents, concentrations, temperatures, exposure times, and applied stresses. The standard emphasizes reporting conventions and limitations of lab-to-service correlation while allowing specification of additional reagents or conditions relevant to particular end uses.

General information

• Status: Active (current edition D543-21).
• Publication date: December 2021 (document records show publication/last update in early December 2021).
• Publisher: ASTM International (Committee D20, Subcommittee D20.50).
• ICS / categories: Plastics in general — ICS code typically referenced for plastics testing (example listing: 83.080.01).
• Edition / version: D543-21 (2021 edition), DOI 10.1520/D0543-21.
• Number of pages: 8 pages.

Summary information derived from the ASTM document listing and standards catalogs.

Scope

These practices cover evaluation of all plastic materials (cast, hot- or cold-molded, laminated resinous products, and sheet materials) for resistance to chemical reagents. The standard provides procedures for immersion testing (two variants under Practice A) and for mechanical stress combined with reagent exposure under standardized strain (Practice B). It specifies reporting of quantitative and qualitative property changes, allows for a range of exposure times and temperatures, and lists standard reagents for establishing comparable results while permitting other reagents tailored to specific applications. The standard also notes limitations in correlating short-term laboratory tests with long-term service performance.

Key topics and requirements

• Practice A — Immersion test methods (two variants) for continuous or extended contact conditions.
• Practice B — Mechanical stress plus reagent exposure to assess environmental stress-cracking and stress-assisted degradation.
• Specified reporting: changes in weight, dimensions, appearance, color, and mechanical properties (strength, elongation, etc.).
• Prescribed list of standard reagents and concentrations to promote comparability, with allowance for user-specified reagents relevant to end use.
• Guidance on exposure times, elevated-temperature testing, and conditioning methods (immersion vs. wet-patch/wipe) based on intended service.
• Notes on limitations and the need for appropriate controls and safety/health considerations when selecting reagents and conditions.

These topics reflect the procedures and reporting conventions set out in the ASTM D543-21 text.

Typical use and users

Used by materials engineers, polymer suppliers, product designers, quality and failure‑analysis laboratories, and regulatory/compliance teams to: compare chemical compatibility of candidate plastics, screen materials for suitability in corrosive environments, document resistance for procurement/specification, and investigate field failures where chemical exposure is suspected.

Related standards

ASTM D543 references and is related to other test methods and practices for plastics chemical resistance and stress-cracking evaluation. The standard specifically notes comparable subject matter in ISO 175 and ISO 22088-3 for immersion and some stressed-exposure topics, and discusses differences from ASTM Practice D7474 and Test Method D1693. Historical editions (for example D543-20, D543-14, etc.) document the revision history.

Keywords

chemical resistance; plastics; immersion test; environmental stress cracking; reagents; mechanical stress; material selection; ASTM D543-21.

FAQ

Q: What is this standard?

A: ASTM D543-21 is the 2021 edition of "Standard Practices for Evaluating the Resistance of Plastics to Chemical Reagents," providing standardized procedures and reporting for assessing how plastics respond to chemical exposure.

Q: What does it cover?

A: It covers immersion and stressed-exposure test practices (Practices A and B), lists standard reagents and concentrations for comparable testing, and prescribes how to report changes in physical and mechanical properties after exposure. It also describes limitations and the need to tailor conditions to specific end-use scenarios.

Q: Who typically uses it?

A: Materials and design engineers, test laboratories, polymer manufacturers and suppliers, QA/QC teams, and failure‑analysis professionals use this standard for compatibility screening, specification, and investigation of chemically related failures.

Q: Is it current or superseded?

A: The D543-21 edition is the current (2021) ASTM edition as published in December 2021; previous editions include D543-20, D543-14, etc. Users should check for any amendments or newer revisions before use.

Q: Is it part of a series?

A: It is part of ASTM's plastics testing portfolio developed by Committee D20 (subcommittee D20.50) and complements other ASTM and ISO standards addressing chemical resistance, environmental stress cracking, and plastics properties.

Q: What are the key keywords?

A: Chemical resistance, plastics, immersion test, environmental stress cracking, reagents, mechanical stress, ASTM D543-21.