ASTM_F_1642_-_12.pdf

Designation:F164212Standard Test Method forGlazing and Glazing Systems Subject to Airblast Loadings1This standard is issued under the fixed designation F1642;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.INTRODUCTIONHistorical records show that fragments from glazing that has failed as the result of intentional oraccidental explosions present a serious threat of personal injury.Glazing failure also allows blastpressure to enter the interior of buildings thus resulting in additional threat of personal injury andfacility damage.These risks increase in direct proportion to the amount of glazing used on the buildingfacade.This test method addresses only glazing and glazing systems.It assumes that the designer hasverified that other structural elements have been adequately designed to resist the anticipated airblastpressures.1.Scope1.1 This test method sets forth procedures for the evaluationof hazards of glazing or glazing systems against airblastloadings.The specifying authority shall provide the airblastloading parameters.1.2 The data obtained from testing under this method shallbe used to determine the glazing or glazing system hazardrating using Specification F2912.1.3 This test method allows for glazing to be tested andrated with or without framing systems.1.4 This test method is designed to test and rate all glazing,glazing systems,and glazing retrofit systems including,but notlimited to,those fabricated from glass,plastic,glass-cladplastics,laminated glass,glass/plastic glazing materials,andfilm-backed glass.1.5 The values stated in SI units are to be regarded as thestandard.Values given in parentheses are for information only.For conversion of quantities in various systems of measure-ments to SI units,see E699.1.6 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.See Section 7 forspecific hazards statements.2.Referenced Documents2.1 ASTM Standards:2E699 Practice for Evaluation of Agencies Involved inTesting,Quality Assurance,and Evaluating of BuildingComponentsE997 Test Method for Evaluating Glass Breakage Probabil-ity Under the Influence of Uniform Static Loads by ProofLoad TestingF2912 Specification for Glazing and Glazing Systems Sub-ject to Airblast Loadings2.2 ISO Standard:ISO/IEC International Standard 17025 General Require-ments for the Competence of Testing and CalibrationLaboratories2.3 ANSI Standard:SI 10 American National Standard for Use of the Interna-tional System of Units(SI):The Modern Metric System3.Terminology3.1 Definitions:3.1.1 airblast pressurethe pressure increase that a sur-face experiences due to the detonation of a high explosivecharge.3.1.1.1 DiscussionThe airblast pressure history,as mea-sured at a point on the surface,consists of two separate phases.The positive phase is characterized by a nearly instantaneousrise to a maximum pressure followed by an exponential decayto ambient pressure.In the negative phase,which follows1This test method is under the jurisdiction ofASTM Committee F12 on SecuritySystems and Equipmentand is the direct responsibility of Subcommittee F12.10 onSystems Products and Services.Current edition approved Nov.15,2012.Published January 2013.Originallyapproved in 1995.Last previous edition approved in 2010 as F1642 04(2010).DOI:10.1520/F1642-12.2For 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 immediately the positive phase,the pressure decreases belowambient for a period of time before returning to ambient.3.1.2 ambient temperature24 6 11C(75 6 20F).3.1.3 blast mata steel or concrete pad upon which highexplosive may be detonated to reduce the incidence of ejecta.3.1.4 effective positive phase duration(T)the duration ofan idealized triangular positive phase reflected airblast pressurehistory,having an instantaneous rise to the measured P,with alinear decay to ambient,such that the impulse of the idealizedpressure history equals i of the measured positive phasereflected airblast history.3.1.4.1 DiscussionThe idealized triangular airblast waveis considered to provide a reliable standard measure of thepositive phase airblast intensity.3.1.5 hazard levelrating assigned to the performance ofthe glazing system based on the amount and location of integralmaterials expelled from the system under specific blas