ASTM_F_1642_-_F_1642M_-_17.pdf

Designation:F1642/F1642M17Standard Test Method forGlazing and Glazing Systems Subject to Airblast Loadings1This standard is issued under the fixed designation F1642/F1642M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONHistorical records show that fragments from glazing that have 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.Glazing systems shall be as defined inSpecification F2912.1.2 The data obtained from testing under this method shallbe used to determine the glazing,glazing system,or glazingretrofit system hazard rating 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,or-ganic coated glass,and other glazing retrofit systems notdirectly attached to the glazing or glazing system such as blastcurtains,cables,shades,and architectural mesh.1.5 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard.Thevalues stated in each system may not be exact equivalents;therefore,each system shall be used independently of the other.Combining values from the two systems may result in noncon-formance with the standard.For conversion of quantities invarious systems of measurements to SI units,see SpecificationE699.1.6 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 Specification forAgencies Involved in Testing,QualityAssurance,and Evaluating of Manufactured 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 pressure,npressure increase that a surfaceexperiences due to the detonation of an explosive charge.1This 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 March 1,2017.Published March 2017.Originallyapproved in 1995.Last previous edition approved in 2012 as F1642 12.DOI:10.1520/F1642_F1642M-17.2For 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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 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 followsimmediately the positive phase,the pressure decreases belowambient for a period of time before returning to ambient.3.1.2 ambient temperature,n24 6 11C 75 6 20F