ASTM_E_2923_-_14.pdf

Designation:E292314Standard Practice forLongevity Assessment of Firestop Materials UsingDifferential Scanning Calorimetry1This standard is issued under the fixed designation E2923;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers a standardized procedure for quan-titatively assessing the longevity of materials used in firestopsystems,by the use of data obtained from differential scanningcalorimetry.1.2 This practice is intended to differentiate firestop mate-rials that are expected to maintain performance characteristicsover time from those that are expected to degrade in perfor-mance characteristics over time.DSC experimental curveevaluation can also deliver indifferent results,where an inter-pretation of sample properties is not possible without addi-tional testing using conventional durability testing.It evaluatesthe extent of chemical reactions that will occur within thefirestop material under specified conditions of temperature andhumidity.This practice does not measure longevity underspecific severe environmental conditions or building operationthat might be experienced by an individual firestop system.1.3 This practice is intended to be used to test the materialsused within a firestopping system.The practice is not intendedto be used to test the properties of assembled firestoppingsystems.1.4 This practice is intended to evaluate the following typesof materials used in through-penetration fire stops:1.4.1 Endothermic,1.4.2 Intumescent,1.4.3 Insulation,1.4.4 Ablatives,and1.4.5 Subliming.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.Some specifichazards are given in Section 8 on Hazards.2.Referenced Documents2.1 ASTM Standards:2E814 Test Method for Fire Tests of Penetration FirestopSystemsE2041 Test Method for Estimating Kinetic Parameters byDifferential Scanning Calorimeter Using the Borchardtand Daniels Method3.Terminology3.1 Definitions:3.1.1 firestop material,nthe part of a firestop system thatprovides the necessary seal to prevent the passage of flame andhot gases when tested in accordance with Test Method E814.This includes any material that serves the purpose of closingand sealing the gap(s)created in a fire-resistance rated wall orfloor to accommodate a through-penetration.3.1.2 longevity,na measure of the length of time a productmeets specified performance requirements.3.1.2.1 DiscussionLongevity is not intended to be a mea-sure of how long a product retains the precise properties that ithad at the time of manufacture.Most materials will changeover time to some extent,so a measurement of time beforediscernible change occurs would not generally be realistic oruseful.Rather,longevity is intended to be a measure of howlong a product retains its properties to a sufficient degree to bedeemed as meeting the purpose(s)for which it was manufac-tured.4.Summary of Practice4.1 A small sample of the firestop material is tested bydifferential scanning calorimetry in accordance with TestMethod E2041 to determine the following information:4.1.1 Calculation of total released energy.1This practice is under the jurisdiction of ASTM Committee E06 on Perfor-mance of Buildings and is the direct responsibility of Subcommittee E06.21 onServiceability.Current edition approved May 1,2014.Published May 2014.Originallyapproved in 2013.Last previous edition approved in 2013 as E292313.DOI:10.1520/E2923142For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.1.2 Determination of reaction order.4.1.3 Determination of activation energy and Arrheniusfrequency factor.4.1.4 Calculation of the conversion rate for 270 days at70C.4.1.5 Calculation of the conversion rate for 30 years(10 950days)at 50C.4.2 Using the kinetic data,the chemical conversion rate forthe material can be calculated for any time duration andtemperature combination.The conversion rate for that time andtemperature is then compared to the predetermined threshold ofacceptability.That threshold shall be expressed as the largestfraction of the original material that shall be permitted toundergo change through chemical reaction(s)while still allow-ing the m