ASTM D3418-21 rus PDF

Full title and description

ASTM D3418-21 — Standard Test Method for Transition Temperatures and Enthalpies of Fusion and Crystallization of Polymers by Differential Scanning Calorimetry. This standard specifies procedures for using differential scanning calorimetry (DSC) to determine polymer thermal transitions (glass transition, melting, crystallization) and to quantify associated enthalpies. The suffix "rus" in the provided title typically indicates a request or availability of a Russian-language version or translation; the official ASTM publication is in English while translated copies may be available from national standards bodies or translation services.

Abstract

This test method describes measurement of transition temperatures and enthalpies of fusion and crystallization for polymers using DSC. It covers specimen preparation, instrument calibration, test cycles (heating/cooling rates), reporting conventions, and limitations (types of polymers and temperature ranges). The method is used for identification, acceptance testing, process control and research into polymer thermal behavior.

General information

• Status: Active standard (current edition D3418-21).
• Publication date: 2021 (current edition updated/issued in 2021; ASTM listing notes last update in September 2021).
• Publisher: ASTM International (formerly American Society for Testing and Materials).
• ICS / categories: Plastics in general — ICS 83.080.01 (relevant category for plastics and polymer testing).
• Edition / version: D3418-21 (2021 edition).
• Number of pages: 8 pages (concise test method document).

Scope

The standard covers determination of transition temperatures and the enthalpies of fusion and crystallization of polymers by differential scanning calorimetry. It applies to polymer materials in forms from which suitable specimens can be prepared and is normally applied over an operating temperature range from cryogenic levels up to about 600 °C (equipment-dependent). The method is not universally applicable to all polymer types without modification and notes that true heats of fusion often require complementary structural analysis and specialized crystallization techniques.

Key topics and requirements

• Instrument calibration and verification (temperature and enthalpy calibration, e.g., using indium or other standards).
• Specimen preparation and mass control to ensure reproducible results (typical sample masses and pan sealing guidance).
• Recommended heating/cooling rates and multi-cycle testing to resolve reversible and non‑reversible transitions.
• Definitions and reporting of transition temperatures (onset, peak) and enthalpy values (J/g) with stated units in SI.
• Limitations and applicability notes (examples of polymers or phenomena that may require modified procedures).
• Comparability notes relative to ISO standards (ISO 11357 series provides related DSC procedures and additional information).

Typical use and users

Common users include polymer and materials laboratories, quality control teams in plastics and rubber manufacturing, research and development groups investigating polymer morphology and crystallinity, and third‑party testing laboratories performing acceptance testing. The method is used for Tg, Tm, Tc determination, estimating percent crystallinity (when combined with reference enthalpies), and process control investigations.

Related standards

ISO 11357 series (parts 1–3 and others) on thermal analysis and DSC methods — similar but not identical procedures offering additional guidance. ASTM D3418 also has a documented interlaboratory precision study (Research Report RR:D20-1249) associated with the method. Historical and prior editions of D3418 (e.g., -15, -12e1, earlier) provide context on development and editorial changes.

Keywords

differential scanning calorimetry; DSC; transition temperature; glass transition (Tg); melting temperature (Tm); crystallization temperature (Tc); enthalpy of fusion; heat of crystallization; polymers; crystallinity; thermal analysis.

FAQ

Q: What is this standard?

A: ASTM D3418-21 is a concise ASTM test method that defines how to use DSC to determine polymer transition temperatures and the enthalpies associated with melting and crystallization.

Q: What does it cover?

A: It covers specimen preparation, instrument calibration, DSC run conditions (heating/cooling cycles), how to identify and report transition temperatures and enthalpy values, and the method's limitations and applicable temperature range. It does not claim to address every polymer class without modification.

Q: Who typically uses it?

A: Polymer scientists, QC/QA laboratories in plastics and rubber industries, DSC instrument users, and independent testing labs use this method for identification, acceptance testing, process control, and research.

Q: Is it current or superseded?

A: The D3418-21 edition is the current ASTM edition (2021). Previous editions (for example D3418-15 and earlier) have been superseded by the -21 edition. Users should confirm they have the latest revision from ASTM International.

Q: Is it part of a series?

A: D3418 is a standalone ASTM test method but is closely related to and comparable with DSC-related parts of the ISO 11357 series; laboratories often consult both for complementary guidance.

Q: What are the key keywords?

A: DSC, transition temperatures, Tg, Tm, Tc, enthalpy of fusion, heat of crystallization, polymer thermal analysis, crystallinity.