ASTM E1981-22 PDF
Standard Guide for Assessing Thermal Stability of Materials by Methods of Accelerating Rate Calorimetry
Standard Guide for Assessing Thermal Stability of Materials by Methods of Accelerating Rate Calorimetry
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 8
- Дата публикации:
- 1 июня 2022 г.
- Издание:
- E1981
- ICS:
- 17.200.10
SIGNIFICANCE AND USE 5.1 The data from this guide seldom, if ever, directly simulate thermal and pressure events in the processing, storage, and shipping of chemicals. However, the data obtained from this guide may be used, with suitable precautions, to predict the thermal and pressure hazards associated with processing, storage, and shipping of a chemical or mixture of chemicals after appropriate scaling of the data. This has been addressed in the literature (1-4) but is beyond the scope of this guide. 5.2 This guide is suitable, under the proper conditions, for the investigation of the effects of catalyst, inhibitors, initiators, reaction atmospheres, materials of construction, or, if available, agitation (see 6.1.2). 5.3 Interpretation of the time-temperature or time-pressure data may be possible for relatively simple systems through the use of suitable temperature-dependent kinetic theories such as the Arrhenius and Absolute Reaction Rate theories (5, 6). SCOPE 1.1 This guide covers suggested procedures for the operation of a calorimetric device designed to obtain temperature and pressure data as a function of time for systems undergoing a physicochemical change under nearly adiabatic conditions. 1.2 This guide outlines the calculation of thermodynamic parameters from the time, temperature, and pressure data recorded by a calorimetric device. 1.3 The assessment outlined in this guide may be used over a pressure range from full vacuum to the rated pressure of the reaction container and pressure transducer. The temperature range of the calorimeter typically varies from ambient to 500 °C, but also may be user specified (see 6.6). 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific safety precautions are outlined in Section 7. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Abstract
Overview
ASTM E1981-22: Standard Guide for Assessing Thermal Stability of Materials by Methods of Accelerating Rate Calorimetry provides recommended procedures for evaluating the thermal stability of materials through the use of accelerating rate calorimetry (ARC). Thermal stability assessments are critical in understanding and managing the risks associated with the storage, processing, and transport of chemicals. This standard details the methodology for generating and interpreting temperature and pressure data as materials undergo physicochemical changes under nearly adiabatic conditions.
ARC is a powerful tool for detecting hazardous exothermic reactions, calculating thermodynamic parameters, and identifying potential runaway reactions. While the standard does not simulate real-world events directly, it provides data that, when properly interpreted and scaled, help predict thermal and pressure hazards related to chemical systems. Compliance with ASTM E1981-22 supports improved chemical process safety, regulatory conformity, and hazard mitigation in chemical industries.
Key Topics
- Adiabatic Calorimetry: Details the use of adiabatic calorimeters, which maintain minimal heat exchange between the sample and the environment for accurate measurement.
- Testing Procedure: Outlines stepwise methods for sample preparation, mounting, calibration, data collection, and post-test analysis.
- Thermal Stability Assessment: Focuses on detecting exothermic events, quantifying self-heating rates, onset temperatures, and pressure changes during material degradation.
- Thermodynamic Calculations: Guides users in calculating critical parameters such as adiabatic temperature rise, heat of reaction, and time-to-maximum rate (TMR).
- Hazard Prediction: Discusses applying ARC data to assess and predict thermal and pressure hazards associated with chemical handling and storage.
- Operational Limitations: Addresses sample homogeneity, physical states (solid/liquid), agitation, and calibration limitations influencing test outcomes.
- Safety Precautions: Emphasizes safety measures for handling hazardous or reactive materials, pressurized containers, and potential toxic emissions during testing.
Applications
The practical value of ASTM E1981-22 lies in its wide range of industrial and research applications involving thermal stability:
- Chemical Manufacturing: Predicts and manages risks of runaway reactions and thermal hazards during processing of chemicals and chemical mixtures.
- Storage and Transportation: Assesses the stability of materials under varying environmental conditions, supporting safe storage and shipping protocols.
- Process Safety Management: Provides essential data to design safer processes, perform risk assessments, and implement engineering controls.
- Material Compatibility Studies: Evaluates the effects of catalysts, inhibitors, initiators, atmosphere, materials of construction, and agitation on reaction behavior.
- Kinetic Analysis: Assists in interpreting reaction kinetics using temperature-dependent theories for simple, non-autocatalytic systems.
- Incident Investigation: Offers data crucial for analyzing the root causes of thermal incidents involving chemical materials.
Related Standards
ASTM E1981-22 integrates with other ASTM international standards focused on thermal hazard assessment and calorimetry, supporting a comprehensive approach to chemical safety:
- ASTM E487: Test Methods for Constant-Temperature Stability of Chemical Materials
- ASTM E537: Test Method for Thermal Stability of Chemicals by Differential Scanning Calorimetry
- ASTM E698: Test Method for Kinetic Parameters for Thermally Unstable Materials Using Differential Scanning Calorimetry and the Flynn/Wall/Ozawa Method
- ASTM E680: Test Method for Drop Weight Impact Sensitivity of Solid-Phase Hazardous Materials
- ASTM E1231: Practice for Calculation of Hazard Potential Figures of Merit for Thermally Unstable Materials
Adhering to ASTM E1981-22 ensures consistent, reliable evaluation of thermal hazards, advancing chemical safety and regulatory compliance across industries that handle potentially reactive or unstable materials. Use of this standard contributes to the responsible management of chemical risks and underpins a strong safety culture.
Технические детали
- Технический комитет
- E27 - Hazard Potential of Chemicals
- SKU
- ASTM E1981-22
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