ASTM_F_1236_-_19.pdf

Designation:F123619Standard Guide forVisual Inspection of Electrical Protective Rubber Products1This standard is issued under the fixed designation F1236;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 The purpose of this guide is to present methods andtechniques for the visual inspection of electrical protectiverubber products.This guide also includes descriptions andphotographs of irregularities found in these products.NOTE1It is not the purpose of this guide to establish the acceptancelevel of any irregularity described herein.That shall be established by thestandard for each product.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2F478 Specification for In-Service Care of Insulating LineHose and CoversF479 Specification for In-Service Care of Insulating Blan-ketsF496 Specification for In-Service Care of Insulating Glovesand SleevesF819 Terminology Relating to Electrical Protective Equip-ment for Workers3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 abrasions and scratchessurface damage that nor-mally occurs when a product makes contact with an abrasivesurface(see Fig.1 and Fig.2).3.1.1.1 DiscussionScuff-like damage can also occur froma brush contact with a hot object such as a soldering iron.Thiscan sometimes look like the graining on leather.3.1.2 age crackssurface cracks that may look like thecrazing of glazed ceramics and become progressively worsewith time(see Fig.3).3.1.2.1 DiscussionIt is a slow oxidation process caused byexposure to sunlight(or other environmental conditions)andstarts in areas of the rubber that are under stress;see 3.1.14 forozone cracks damage.3.1.3 breakdown the electrical discharge or arc occurringbetween the electrodes and through the equipment being tested(see Figs.4-6).3.1.4 chemical blooma white or yellowish discolorationon the surface of a rubber product caused by the migration tothe surface of chemical additives used in the manufacturingprocess of the finished product(see Fig.7),caused by thenatural aging process.3.1.4.1 DiscussionNot to be confused with 3.1.10 glovediscoloration.3.1.5 color splasha spot or blotch on the surface of arubber product that occurred during the manufacturing processwhen a contrasting colored particle of unvulcanized rubberbecame embedded into the finished product(see Fig.8).3.1.6 cutssmooth incisions in the surface of the rubberthat are usually caused by a sharp-edged object that canincrease in size when they are placed under strain(see Fig.9).3.1.7 depressions or indentationsa shallow recess in thesurface of the rubber that exhibits a thinner rubber thickness atthe bottom of the depression than in the surrounding areas(seeFig.10).3.1.8 embedded foreign mattera particle of non-rubbermaterial that has been molded into the finished product andmay appear as a bump when the rubber is stretched(see Fig.11).1This guide is under the jurisdiction of ASTM Committee F18 on ElectricalProtective Equipment for Workers and is the direct responsibility of SubcommitteeF18.60 on Terminology.Current edition approved May 1,2019.Published June 2019.Originallyapproved in 1989.Last previous edition approved in 2018 as F1236 18.DOI:10.1520/F1236-19.2For 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 3.1.9 form marksa raised or indented section on thesurface of the rubber that was caused by