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Standard Practice for Calculation of Hazard Potential Figures-of-Merit for Thermally Unstable Materials
Automatische name übersetzung:
Standard Praxis zur Berechnung der Gefährdungspotenzial Die Zahlen -of- Merit für thermisch instabile Materialien
NORM herausgegeben am 1.4.2006
Bezeichnung normen: ASTM E1231-01(2006)
Anmerkung: UNGÜLTIG
Ausgabedatum normen: 1.4.2006
SKU: NS-40947
Zahl der Seiten: 7
Gewicht ca.: 21 g (0.05 Pfund)
Land: Amerikanische technische Norm
Kategorie: Technische Normen ASTM
Keywords:
adiabatic decomposition temperature rise, adiabatic temperature rise, critical dimension, critical temperature, differential scanning calorimetry, explosion potential, hazard potential, instability rating, instantaneous power density, shock sensitivity, thermal analysis, thermal hazard, thermal hazard potential, thermal runway, ICS Number Code 13.230 (Explosion protection)
Significance and Use | ||||||||||||||||||||||||||
This practice provides eight figures-of-merit which may be used to estimate the relative thermal hazard potential of thermally unstable materials. Since numerous assumptions must be made in order to obtain these figures-of-merit, care must be exercised to avoid too rigorous interpretation (or even misapplication) of the results. This practice may be used for comparative purposes, specification acceptance, and research. It should not be used to predict actual performance. |
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1. Scope | ||||||||||||||||||||||||||
1.1 This practice covers the calculation of hazard potential figures-of-merit for exothermic reactions, including: Time-to-thermal-runaway,Critical half thickness,Critical temperature,Adiabatic decomposition temperature riseExplosion potential,Shock sensitivity,Instantaneous power density, andNFPA instability rating.1.2 The kinetic parameters needed in this calculation may be obtained from differential scanning calorimetry (DSC) curves by methods described in other documents. 1.3 This technique is the best applicable to simple, single reactions whose behavior can be described by the Arrhenius equation and the general rate law. For reactions which do not meet these conditions, this technique may, with caution, serve as an approximation. 1.4 The calculations and results of this practice might be used to estimate the relative degree of hazard for experimental and research quantities of thermally unstable materials for which little experience and few data are available. Comparable calculations and results performed with data developed for well characterized materials in identical equipment, environment, and geometry are key to the ability to estimate relative hazard. 1.5 The figures-of-merit calculated as described in this practice are intended to be used only as a guide for the estimation of the relative thermal hazard potential of a system (materials, container, and surroundings). They are not intended to predict actual thermokinetic performance. The calculated errors for these parameters are an intimate part of this practice and must be provided to stress this. It is strongly recommended that those using the data provided by this practice seek the consultation of qualified personnel for proper interpretation. 1.6 The SI units are standard. 1.7 There is no ISO standard equivalent to this practice. 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 and health practices and determine the applicability of regulatory limitations prior to use. |
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2. Referenced Documents | ||||||||||||||||||||||||||
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