1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUNDERWRITERS LABORATORIES INC. CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared and published by Underwriters Laboratories Inc.(UL). It is normative for the a
2、pplicable UL Product Certification Program(s); however, it is currently notpart of the UL Standard(s) referenced below.Product Category (CCN): TGAM, TFWZ, TFXXStandard Number: UL 2218Edition Date: January 25, 2010Edition Number: 2Section / Paragraph Reference: 4.4.3Subject: Clarification on the Use
3、of Masking tape During Preparation of SamplesDECISION:4.4.3 For roof covering materials with factory-applied adhesives, are to be sealed by placing thecompleted test assemblies are to be placed in a conditioning cell at a temperature of 57 60C (135 140F) for a continuous period of 16 hours. To avoid
4、 damage when examining tested samples, preventthe self-seal adhesive from adhering by covering it with masking tape or other similar type material. Afterconditioning, the test assemblies are to be allowed to cool to room temperature. Care is to be taken toavoid disturbing shingle tabs or causing any
5、 twisting or distortion of the test panels in handling.RATIONALE FOR DECISION:The current Standard, as written, requires that roof-covering materials with factory-applied adhesives besealed by placing the sample in a conditioning cell at the required temperatures for 16 hours.However, based on many
6、years of testing experience, it has become common test practice of testlaboratories cover the self-sealing adhesive with masking tape or other similar types on materials. Thepurpose of this practice is to prevent the self-seal adhesive from actually adhering, which would in mostcases lead to damage
7、when examining the samples during post-test observations.Copyright 2011 Underwriters Laboratories Inc.UL, in performing its functions in accordance with its objectives, does not guarantee or warrant thecorrectness of Certification Requirement Decisions it may issue or that they will be recognized or
8、 adoptedby anyone. Certification Requirement Decisions are the opinion of Underwriters Laboratories Inc. inpractically applying the requirements of the standard. They do not represent formal interpretations of thestandard under American National Standards Institute (ANSI) processes. UL shall not be
9、responsible toanyone for the use of or reliance upon Certification Requirement Decisions by anyone. UL shall not incurany obligation or liability for damages, including consequential damages, arising out of or in connectionwith the use or reliance upon Certification Requirement Decisions. The electr
10、onic version of theCertification Requirement Decision is the current version and previously printed copies may be outdated.This document is published as a service to ULs certification customersUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSTANDARD NUMBER: UL 2218 -2-No Text on This Page
