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): FKVSStandard Number: UL 935Edition Date: May 21, 2001Edition Number: 10Section / Paragraph Reference: Table 25.1 (Revised)Subject: Alternate Test Method for
3、Determining the Softening Point of a PottingCompoundDECISION:Existing footnote b of Table 25.1 shall be revised as follows:bUnless the material is thermoal-setting, the maximum potting- compound temperature, when correctedto a 40C (104F) ambient temperature, is shall be:1. at least 15C (27F) less th
4、an the softening point of the compound as determined by theStandard Test Methods for Softening Point of Resins Derived from Naval Stores by Ring-and-Ball Apparatus, (ASTM E28-1992.); or2. at least 15C less than the softening point of the compound as determined by the StandardTest Method for Softenin
5、g Point of Bitumen (ASTM D36/D36M); or3. at least 25 C less than the softening point of the compound as determined by the StandardTest Method for Vicat Softening Temperature of Plastics (ASTM D1525).RATIONALE FOR DECISION:The addition of D36/D36M is a clarification of current practice, since the sco
6、pe of E28 already requiresthat test method D36 be used when testing asphalts, tars, and pitches.The addition of the D1525 allows manufacturers the option of evaluating the suitability of potting materialsusing a more widely available and well established test method. The criterion for this test meth
7、od isderived from UL 746A, Standard for Polymeric Materials - Short Term Property Evaluations; and UL 746C,Standard for Polymeric Materials - Use in Electrical Equipment Evaluations.Copyright 2011 Underwriters Laboratories Inc.UL, in performing its functions in accordance with its objectives, does n
8、ot guarantee or warrant thecorrectness of Certification Requirement Decisions it may issue or that they will be recognized or adoptedby anyone. Certification Requirement Decisions are the opinion of Underwriters Laboratories Inc. inpractically applying the requirements of the standard. They do not r
9、epresent formal interpretations of thestandard under American National Standards Institute (ANSI) processes. UL shall not be responsible toanyone for the use of or reliance upon Certification Requirement Decisions by anyone. UL shall not incurany obligation or liability for damages, including conseq
10、uential damages, arising out of or in connectionwith the use or reliance upon Certification Requirement Decisions. The electronic version of theCertification Requirement Decision is the current version and previously printed copies may be outdated.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULThis document is published as a service to ULs certification customersSTANDARD NUMBER: UL 935 -2-
