1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 796F Flexible Materials Interconnect ConstructionsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHOR
2、IZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Flexible Materials Interconnect Constructions, UL 796F Third Edition, Dated August 28, 2015 Summary of Topics This new edition of UL 796F was issued to include the following changes in requirements: 1
3、. Addition of the Term Blistering to the Glossary as Paragraph 1.6.13 2. Addition of the Terms “Build-up Material” and “High Density Interconnect Materials” to the Glossary as Paragraphs 1.6.17 and 1.6.95 3. Addition of the Term “Cladding” to the Glossary as Paragraph 1.6.25 4. Addition of the Term
4、“Conductor Weight” to the Glossary as Paragraph 1.6.43 5. Addition of the Terms “Legend Ink” and “Marking Ink” to the Glossary as Paragraphs 1.6.108 and 1.6.109 6. Addition of the Term “Minimum Conductor Width” to the Glossary as Paragraph 1.6.114 7. Addition of the Terms “Plugged Hole Material” and
5、 “Resist Coating” to the Glossary as Paragraphs 1.6.127 and 1.6.142 8. Addition of the Term “Sample” to the Glossary as Paragraph 1.6.147 9. Addition of the Terms “Surface Finish” and “Surface Plating” to the Glossary as Paragraphs 1.6.160 and 1.6.163 10. Clarication of Requirements for Polyimide AN
6、SI-Like Program in Paragraph 2.1.14.2 11. Clarication of Requirements for the Edge Conductor in Paragraphs 2.3.17, 5.1.6.1, and Figure 5.6.1 12. Clarication of Requirements For Maximum Area Diameter Conductors in Paragraphs 2.3.20 and 2.3.21 13. Clarication of Requirements for Data Collection in Sec
7、tion 5.1.6 14. Clarication of Requirements for Data Collection in Sections 5.4.3, 5.5.4, 5.6.3, 5.7.3, 5.8.3, 5.8.5, 5.9.3, 5.10.3, 5.11.3, 5.12.3, 5.13.3, and 5.14.3 The new and revised requirements are substantially in accordance with Proposal(s) on this subject dated November 14, 2014. All rights
8、 reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of any kind, either expressed
9、 or implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. AUGUST 28, 2015 UL 796F tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL In no event will UL be liable for any special, incident
10、al, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other damages arising out of the use of or the inability to use this Standard, even if UL or an authorized UL representative has been advised of the possibility of such damage. In no event sha
11、ll ULs liability for any damage ever exceed the price paid for this Standard, regardless of the form of the claim. Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judgment (
12、including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. AUGUST 28, 2015 UL 796F tr2UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FRO
13、M UL AUGUST 28, 2015 1 UL 796F Standard for Flexible Materials Interconnect Constructions First Edition September, 2000 Second Edition October, 2010 Third Edition August 28, 2015 This ANSI/UL Standard for Safety consists of the Third Edition. The most recent designation of ANSI/UL 796F as an America
14、n National Standard (ANSI) occurred on August 28, 2015. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be
15、submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and righ
16、ts regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2015 UNDERWRITERS LABORATORIES INC. ANSI/UL 796F-2015UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 28, 2015 FLEXIBLE MATERIALS INTERCONNECT C
17、ONSTRUCTIONS - UL 796F 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS 1 Introduction 5 1.1 Scope .5 1.2 Units of measurement .5 1.3 Supplementary test procedures 5 1.4 References 6 1.5 General .6 1.6 Glossary
18、7 1.7 Abbreviations .17 2 Materials 18 2.1 General 18 2.2 Base materials 20 2.3 Conductors and conductor adhesives 23 2.4 Bonding lm (supported and unsupported) and internal bonding materials 27 2.5 Cover material (coverlay, coverlm and covercoat) 30 2.6 Solder resist, solder mask, and permanent coa
19、tings .32 2.7 Plugged-hole materials .33 2.8 High density interconnect (HDI) dielectric materials 35 2.9 Stiffener and adhesive (external bonding) materials 37 3 FMIC Constructions 40 3.1 General 40 3.2 Singlelayer (dielectrics) .43 3.3 Multilayer (dielectrics) 45 3.4 Flexible 48 3.5 Flex-to-install
20、 .49 3.6 Rigid .50 3.7 Multilayer rigid ex composite .50 3.8 Flammability classication only 56 3.9 Glossary of construction and FMIC titles .56 4 Processes 58 4.1 General 58 4.2 Process description 58 4.3 Variations in processes 59 5 Tests .60 5.1 General 60 5.2 Microsection analysis 72 5.3 Thermal
21、stress test 74 5.4 Delamination test 77 5.5 Plating adhesion test 79 5.6 Bond strength test .82 5.7 Conductive paste adhesion test .90 5.8 Coverlay test 96 5.9 (Ambient) bend test 98 5.10 Cold-bend test 103 5.11 Repeated exing test 106 5.12 Stiffener bond strength test .111 5.13 Silver migration tes
22、t .120 5.14 Dissimilar Dielectric Materials Thermal Cycling Test .127 5.15 Flammability tests .130 5.16 Direct support requirements (DSR) tests .132 6 Parameter Prole Indices 134 6.1 General .134 AUGUST 28, 2015 FLEXIBLE MATERIALS INTERCONNECT CONSTRUCTIONS - UL 796F 3UL COPYRIGHTED MATERIAL NOT AUT
23、HORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6.2 Maximum operating temperature (MOT) .135 6.3 Flammability classication .136 6.4 Solder limits .136 6.5 Thickness .137 6.6 Conductor weight 138 6.7 Conductor width 138 6.8 Maximum area conductor diameter .138 6.9 Direct s
24、upport requirements (DSR) .138 7 Markings .139 7.1 General .139 7.2 Type designation .139 7.3 Trademark 139 7.4 Manufacturer identication .140 7.5 FMIC category constructions .140 7.6 Flammability classication .140 7.7 Flammability classication only constructions 141 7.8 Direct support requirements
25、(DSR) .141 7.9 Comparative tracking index (CTI) .141 7.10 System component symbol (SCS) .141 7.11 Size class number (SCN) 142 7.12 Additional stiffener and adhesive (external bonding) materials 143 AUGUST 28, 2015 FLEXIBLE MATERIALS INTERCONNECT CONSTRUCTIONS - UL 796F 4UL COPYRIGHTED MATERIAL NOT A
26、UTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 1 Introduction 1.1 Scope 1.1.1 These requirements apply to exible material printed wiring board constructions (FMICs) for use as components in exible, ex-to-install, rigid, and multilayer rigid-ex composite applications wi
27、th and without stiffener and adhesive materials in devices or appliances. 1.1.2 Together with the Standards mentioned in the Supplementary Test Procedures, 1.3, these requirements provide data with respect to the physical, electrical, ammability, thermal, and other properties of the FMIC under consi
28、deration and are intended to provide guidance to the fabricator, end product manufacturer, safety engineers and other interested parties. 1.1.3 Compliance with these requirements does not indicate the product is acceptable for use as a component of an end product without further investigation. 1.1.4
29、 The singlelayer and multilayer exible, ex-to-install, and multilayer rigid-ex composite constructions addressed by these requirements consist of conductors affixed to base material, with mid-board interconnections, and cover materials. 1.1.5 The suitability of additional stiffener and adhesive mate
30、rials, not evaluated in accordance with Stiffener and adhesive (external bonding) materials, 2.9, the Stiffener bond strength test, 5.12, and Flammability tests, 5.15, are subject to the applicable end-use product construction and performance requirements. See Additional stiffener and adhesive (exte
31、rnal bonding) materials, 7.12, for marking requirements for FMICs provided with additional stiffener and adhesive materials not investigated. 1.1.6 The requirements for rigid printed wiring boards are in the Standard for Printed Wiring Boards, UL 796. 1.2 Units of measurement 1.2.1 Values stated wit
32、hout parentheses are the requirement. Values in parentheses are explanatory or approximate information. 1.3 Supplementary test procedures 1.3.1 These requirements are intended to be used in conjunction with the following requirements or standards: a) The Standard for Polymeric Materials Short Term P
33、roperty Evaluations, UL 746A, the Standard for Polymeric Materials Long Term Property Evaluations, UL 746B, the Standard for Polymeric Materials Industrial Laminates, Filament Wound Tubing, Vulcanized Fibre, and Materials Used in Printed Wiring Boards, UL 746E, and the Standard for Polymeric Materia
34、ls Flexible Dielectric Film Materials for Use in Printed Wiring Boards and Flexible Materials Interconnect Constructions, UL 746F, contain programs for investigating polymeric materials and industrial laminates. b) The Standard for Tests for Flammability of Plastic Materials for Parts in Devices and
35、 Appliances, UL 94, contains methods for evaluating the ammability of polymeric materials that are intended to be used in electrical equipment. c) The Standard for Printed Wiring Boards, UL 796, covers the minimum performance requirements for rigid printed-wiring boards. AUGUST 28, 2015 FLEXIBLE MAT
36、ERIALS INTERCONNECT CONSTRUCTIONS - UL 796F 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 1.4 References 1.4.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to
37、 the latest edition of that code or standard. 1.4.2 The following is a list of ASTM test procedures referenced in this standard: a) ASTM D 149 Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies. b) AS
38、TM D 374 Standard Test Methods for Thickness of Solid Electrical Insulation. c) ASTM D 1000 Standard Test Methods for Pressure-Sensitive Adhesive-Coated Tapes Used for Electrical and Electronic Applications. d) ASTM D 5374 Standard Test Methods for Forced-Convection Laboratory Ovens for Evaluation o
39、f Electrical Insulation. e) ASTM D 5423 Standard Specication for Forced-Convection Laboratory Ovens for Evaluation of Electrical Insulation. f )A S T ME3Standard Practice for Preparation of Metallographic Specimens. g) IPC TM-650 2.1.1 Microsectioning, Manual Method. h) ISO 291 Plastics Standard Atm
40、ospheres for Conditioning and Testing. 1.5 General 1.5.1 Acceptability of an FMIC in a device or appliance depends on the acceptability of the construction for: a) Continued use under actual service conditions, including the maximum operating temperature (MOT); b) Flammability properties; and c) All
41、 other applicable end-product requirements. 1.5.2 The investigation of an FMIC shall include consideration of the conductor properties, such as weight (thickness), minimum midboard and edge width, and maximum ground plane area, and shall include the conductor forming and materials build-up processes
42、 including solder limits. 1.5.3 Except as indicated in 1.5.4, the factors considered in testing the FMIC conductor supporting material in its application shall include mechanical strength, moisture absorption, combustibility, resistance to ignition from electrical sources, dielectric strength, insul
43、ation resistance, resistance to arc-tracking, and resistance to creeping and distortion at temperatures to which the material is subjected in the end product. The conductor supporting material shall not display a loss of these properties beyond the minimum acceptable level as a result of aging, and
44、relative temperature indices shall be assigned to the conductor supporting material. AUGUST 28, 2015 FLEXIBLE MATERIALS INTERCONNECT CONSTRUCTIONS - UL 796F 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 1.5.4 If an FMIC is entitled with a
45、mmability classication only, the acceptability of the FMIC shall involve only ammability tests. See Flammability tests, 5.15. 1.5.5 An FMIC entitled exible is intended for use where the construction is subject to dynamic exing applications, yet the exural endurance of the construction has not been e
46、valuated. 1.5.6 An FMIC entitled ex-to-install is intended for use where the construction is exed for installation or service (only) and shall not be subject to dynamic or repeated exing applications, yet the exural endurance of the construction has not been evaluated. 1.5.7 An FMIC entitled rigid i
47、s intended for use where the construction is not exed or subject to dynamic or repeated exing applications. 1.5.8 Multilayer rigid ex composite constructions may include single-sided, double-sided, singlelayer and multilayer exible, ex-to-install, and rigid constructions in various sections of an FM
48、IC. 1.6 Glossary 1.6.1 For the purpose of this Standard the following denitions shall apply. 1.6.2 ACCESS HOLE Holes on the same axis through successive layers of materials intended to provide access to the surface of the land on an inner conductor layer of a multilayer category construction. 1.6.3
49、ADDITIVE PROCESS A selective or non-selective process used to deposit a pattern of conductor material(s) on clad or unclad base material. 1.6.4 ADD-ON COMPONENT Discrete, integrated, packaged, or chip components that are attached to an FMIC to function as part of a complete circuit or assembly. 1.6.5 ADHESIVE A substance such as glue or cement used to join, bond, or fasten materials or objects together. 1.6.6 AS-RECEIVED Specimens or samples in an uncondition
