UL 796F CRD-2016 UL Standard for Safety Flexible Materials Interconnect Constructions - Section Paragraph Reference 5 6 5 5 Subject Printed-Wiring Boards (Edition 3 August 28 2015.pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUNDERWRITERS LABORATORIES INC. CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared by UL LLC. It is normative for the applicable ULProduct Certification Program(

2、s); however, it is currently not part of the UL Standard(s) referencedbelow.Product Category (CCN): ZPXK2Standard Number: UL 796FStandard Title: Standard for Flexible Materials Interconnect ConstructionsEdition Date: August 28, 2015Edition Number: 3Section / Paragraph Reference: 5.6.5.5Subject: Prin

3、ted-Wiring BoardsDECISION:5.6.5.5 Peel a uniform width of the conductor from the sample surface base material for a distance of atleast 6.4 7 to 14 mm (0.2575 to 0.551 inch) at a uniform rate of approximately 300 mm/min (12inches/min) (or, approximately 6.4 mm or 0.25 inch in 1.25 seconds 12.7 mm in

4、 2.5 seconds; 0.50 inch in2.5 seconds). The angle between the conductor and the base material shall be maintained at not less than85 degrees during the test. Three force determinations are to be made on each conductor width describedbelow: i.e., three pulls for a distance of 7 to 14 mm (0.275 to 0.5

5、51 inch) shall be made, on each of:Exception: As an alternative to using three force determinations, one force determination can be madeon each conductor described below on each sample tested by peeling a uniform width conductor from thesample surface for a distance of at least 19 mm (0.75 inch).a)

6、A conductor having the minimum average width on the sample;b) A 1.6 mm (0.063 inch) wide conductor;c) An edge conductor having the minimum average width within 0.40 mm (0.015 inch) of theboard edge and not sheared at the board edge, except as described in 2.3. If the edgeconductor does not meet the

7、criteria and/or is not included on the sample, a conductor of otherwidth (d) specified by the fabricator shall be testedd) A midboard/non-edge conductor of other width specified by the fabricator. The other widthconductor is optional unless the edge conductor does not meet the criteria in Conductor

8、andconductor adhesives, 2.3 and/or is not included on the sample test pattern.RATIONALE FOR DECISION:When performing bond strength testing, the initiation of the pull causes the force to over shoot the actualstrength of the conductor as shown in Figure 5.1.7. It has been determined that more consist

9、ent bondstrength data is obtained by using one force determination with a longer distance peel instead of usingthree shorter peel determinations. The longer distance peel allows the conductor pull force to stabilize. Ifthe conductor is pulled for the same distance as required in total during three f

10、orce determinations, thetotal required peel distance does not change. The use of one force determination is being proposed as analternate method to the three force determination to allow for the use of either method depending on thesample configuration. Other minor modifications to the peel descript

11、ive paragraph were made in order toharmonize the wording in UL 796 and UL 796F.Copyright 2016 UL LLCUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUL LLC, in performing its functions in accordance with its objectives, does not guarantee or wa

12、rrant thecorrectness of Certification Requirement Decisions it may issue or that they will be recognized or adoptedby anyone. Certification Requirement Decisions are the opinion of UL LLC. in practically applying therequirements of the standard. They do not represent formal interpretations of the st

13、andard underAmerican National Standards Institute (ANSI) processes. UL LLC shall not be responsible to anyone forthe use of or reliance upon Certification Requirement Decisions by anyone. UL LLC shall not incur anyobligation or liability for damages, including consequential damages, arising out of o

14、r in connection withthe use or reliance upon Certification Requirement Decisions. The electronic version of the CertificationRequirement Decision is the current version and previously printed copies may be outdated.This document is published as a service to ULs certification customersSTANDARD NUMBER: UL 796F -2-