1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 746A Polymeric Materials Short Term Property Evaluations STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYR
2、IGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Polymeric Materials Short Term Property Evaluations, UL 746A Sixth Edition, Dated September 6, 2012 SUMMARY OF TOPICS These revisions to ANSI/UL 746A were issued to incorpora
3、te the following changes in requirements: 1. Clarication Between Short Term Properties (UL 746A) and Long Term Properties (UL 746B) Within Table 9.1 2. Editorial Revision to the Title of Section 20 Text that has been changed in any manner or impacted by ULs electronic publishing system is marked wit
4、h a vertical line in the margin. The new and revised requirements are substantially in accordance with Proposal(s) on this subject dated October 9, 2015. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electro
5、nic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will UL be li
6、able for any special, incidental, 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 o
7、f such damage. In no event shall 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
8、, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. JANUARY 27, 2016 UL 746A tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DIST
9、RIBUTION WITHOUT PERMISSION FROM UL JANUARY 27, 2016 UL 746A tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SEPTEMBER 6, 2012 (Title Page Reprinted: January 27, 2016) 1 UL 746A Standard for Polymeric Materials Short
10、Term Property Evaluations First Edition May, 1976 Second Edition December, 1978 Third Edition August, 1990 Fourth Edition November, 1995 Fifth Edition November, 2000 Sixth Edition September 6, 2012 This ANSI/UL Standard for Safety consists of the Sixth Edition including revisions through January 27,
11、 2016. The most recent designation of ANSI/UL 746A as an American National Standard (ANSI) occurred on January 27, 2016. ANSI approval for a standard does not include the Cover Page, Transmittal Pages and Title Page. Any other portions of this ANSI/UL standard that were not processed in accordance w
12、ith ANSI/UL requirements are noted at the beginning of the impacted sections. The Department of Defense (DoD) has adopted UL 746A on November 3, 1988. The publication of revised pages or a new edition of this Standard will not invalidate the DoD adoption. Comments or proposals for revisions on any p
13、art of the Standard may be submitted to UL at any time. Proposals should be 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 alter
14、ed in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2016 UNDERWRITERS LABORATORIES INC. ANSI/UL 746A-2016UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION
15、WITHOUT PERMISSION FROM UL JANUARY 27, 2016 POLYMERIC MATERIALS SHORT TERM PROPERTY EVALUATIONS - UL 746A 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .8 2 Units of Measurement .8 3 Refe
16、rences .8 4 Glossary .8 5 Supplementary Test Procedures 9 6 Alternate or Equivalent Test Methods 9 7 Characteristics of Polymeric Materials 10 8 Use of Polymeric Materials 10 9 General .11 9.1 Selection of samples and test specimens .11 9.2 Preparation of specimens 11 9.3 Thickness and directional p
17、roperties .11 9.4 Treatment prior to test .11 9.5 Testing conditions .12 9.6 Testing for temperature effects 12 9.7 Apparatus 12 9.8 Results of tests .12 9.9 Polymer variations .13 TESTING FOR MECHANICAL PROPERTIES 10 Tensile Properties of Thermoplastic Polymeric Materials .17 11 Tensile Properties
18、of Elastomers .17 12 Tensile Properties of Thin Polymeric Sheeting 17 13 Izod Impact Test 18 14 Tensile Impact Test .18 15 Charpy Impact Test .18 16 Flexural Properties of Polymeric Materials .18 17 Shear Properties of Polymeric Materials .19 18 Bond Strength of Plated Polymeric Materials .19 18.1 G
19、eneral .19 18.2 Conditioning .20 18.3 Test procedure .20 18.4 Calculations .21 18.5 Report 21 19 Bond-Strength Properties of Adhesives 21 19.1 General .21 19.2 Method A shear strength by tension loading .22 19.3 Method B tensile strength by bar and rod samples .22 19.4 Method C peel strength by u-be
20、nd samples 23 19.5 Method D peel strength by climbing drum apparatus 23 19.6 Method E peel resistance by T samples .23 20 Indentation Hardness of Rubber and Plastics by Means of a Durometer .24 TESTING FOR ELECTRICAL PROPERTIES 21 AC (Alternate Current) Dielectric Breakdown Voltage and Strength .24
21、21A DC (Direct Current) Dielectric Breakdown Voltage and Strength 24A JANUARY 27, 2016 POLYMERIC MATERIALS SHORT TERM PROPERTY EVALUATIONS - UL 746A 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 22 D-C Resistance or Conductance of Insulat
22、ing Materials 24A 23 High-Voltage, Low Current, Dry Arc Resistance Performance Level Categories of Solid Electrical Insulation .24B 24 Comparative Tracking Index and Comparative Tracking Performance Level Categories of Electrical Insulation Materials .27 25 High-Voltage Arc-Tracking-Rate Performance
23、 Level Categories of Solid Insulating Materials .28 25.1 General .28 25.2 Apparatus .28 25.3 Specimens 29 25.4 Test procedure .30 25.5 Report 30 26 Liquid Contaminant, Inclined-Plane Tracking, and Erosion of Insulating Materials .31 MATERIAL DISTORTION UNDER LOAD 27 Deection Temperature of Polymeric
24、 Materials under Load 31 27.1 General .31 28 Vicat Softening Point for Polymeric Materials .31 29 Softening Point by Ring-and-Ball Apparatus 32 30 Ball Pressure Test 32 30.1 General .32 30.2 Test procedure .33 RESISTANCE TO IGNITION OF POLYMERIC MATERIALS 31 General .33 32 Hot Wire Ignition Performa
25、nce Level Categories 33 32.1 General .33 33 High-Current Arc Ignition Performance Level Categories .34 33.1 General .34 33.2 Apparatus .35 33.3 Specimen .36 33.4 Test procedure .36 33.5 Report .36A 34 High-Voltage Arc Resistance to Ignition Performance Level Categories 36B 34.1 General 36B 34.2 Appa
26、ratus .37 34.3 Specimens 38 34.4 Test procedure .39 34.5 Report 39 35 Glow-Wire Ignitability Test .40 35.1 General .40 35.2 Signicance .40 35.3 Apparatus .40 35.4 Specimens 42 35.5 Conditioning .42 35.6 Procedure .42 35.7 Report 43 JANUARY 27, 2016 POLYMERIC MATERIALS SHORT TERM PROPERTY EVALUATIONS
27、 - UL 746A 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DIMENSIONAL CHANGE OF POLYMERIC PARTS 36 General 43 37 Method for Measuring Changes in Linear Dimensions of Polymeric Materials .43 38 Method for Measuring Water Absorption of Polym
28、eric Materials .44 RESISTANCE OF POLYMERIC MATERIALS TO CHEMICAL REAGENTS 39 Test for Resistance of Polymeric Materials to Chemical Reagents 44 TESTS FOR POLYMER IDENTIFICATION 40 General 45 41 Specic Gravity of Polymers 45 42 Density Determination of Foamed Polymeric Materials .45 43 Infrared Spect
29、roscopy 46 43.1 General .46 43.2 Sample preparation .46 43.3 Report 47 44 Determination of Ash Content .47 44.1 General .47 44.2 Materials and equipment 47 44.3 Test procedure .48 44.4 Calculations .48 44.5 Report 48 45 Pyrolytic Gas Chromatography .49 45.1 General .49 45.2 Instrumentation 49 45.3 R
30、eport 49 46 Thermogravimetry 50 47 Differential Scanning Calorimetry 50 REGRIND 48 Regrind of Thermoplastic Polymeric Materials 51 48.1 General .51 48.2 Preparation of regrind specimens 52 48.3 Separate investigations of regrind thermoplastic materials 53 TESTING FOR COMBUSTIBILITY PROPERTIES OF POL
31、YMERIC MATERIALS 48A Microscale Combustion Calorimetry .54 MARKING 49 General 55 AUGUST 28, 2015 POLYMERIC MATERIALS SHORT TERM PROPERTY EVALUATIONS - UL 746A 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SUPPLEMENT SA - FOLLOW-UP INSPECT
32、ION INSTRUCTIONS INTRODUCTION SA1 Scope SA1 SA2 Glossary .SA1 SA3 Responsibility of the Manufacturer SA2 SA4 Responsibility of the Field Representative .SA3 SA5 Selection of Samples for Follow-Up Testing SA3 SA6 Follow-Up Test Program .SA3 APPENDIX A Infrared (IR) Analysis Conformance Criteria A1 Ba
33、ckground & Purpose: .A1 A2 Sample Preparation: A1 A3 Spectral Discrepancies: .A1 A4 Exception Consideration: A2 A5 Denitions: .A3 APPENDIX B Thermogravimetric Analysis (TGA) Conformance Criteria B1 Background & Purpose: .B1 B2 Number of Degradations: B1 B3 Weight Loss Percent: .B1 B4 Onset/Offset Te
34、mperature: .B2 B5 Residual Weight: .B2 B6 Curve Shape: B2 B7 Exception Consideration: B3 B8 Denitions: .B3 APPENDIX C Differential Scanning Calorimetry (DSC) Conformance Criteria C1 Background & Purpose: .C1 C2 Number and type of thermal events: C1 C3 Tolerances: C2 C4 Second Heat: C2 C5 Exception C
35、onsideration: C2 C6 Denitions: .C2A FEBRUARY 27, 2015 POLYMERIC MATERIALS SHORT TERM PROPERTY EVALUATIONS - UL 746A 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APPENDIX D Reference List of Applicable ASTM Test Procedures.D1 FEBRUARY 27,
36、 2015 POLYMERIC MATERIALS SHORT TERM PROPERTY EVALUATIONS - UL 746A 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover short-term test procedures to be used for the evaluation of materials used
37、 for parts intended for specic applications in electrical end products. 1.2 Together with the requirements mentioned in Supplementary Test Procedures, Section 5, these investigations provide data with respect to the physical, electrical, ammability, thermal, and other properties of the materials und
38、er consideration and are intended to provide guidance for the material manufacturer, the molder, the end-product manufacturer, safety engineers, and other interested parties. 1.3 A product that contains features, characteristics, components, materials, or systems new or different from those covered
39、by the requirements in this standard, and that involves a risk of re or of electric shock or injury to persons shall be evaluated using appropriate additional component and end-product requirements to maintain the level of safety as originally anticipated by the intent of this standard. A product wh
40、ose features, characteristics, components, materials, or systems conict with specic requirements or provisions of this standard does not comply with this standard. Revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implement
41、ation of this standard. 2 Units of Measurement 2.1 If a value for measurement as given in these requirements is followed by an equivalent value in other units, in parentheses, the second value may be only approximate. The rst stated value is the other requirement. 3 References 3.1 Any undated refere
42、nce to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. 3.2 Appendix D contains a list of ASTM test procedures referenced in this standard. 4 Glossary 4.1 For the purposes of this standard the followin
43、g denitions apply: 4.2 MAXIMUM REGRIND LEVEL (MRL) Percentage by weight of regrind in a polymeric material that may not be exceeded when used in further molding processes. 4.3 MOLDER Performs injection, extrusion, transfer, compression, rotational, co-molding, thermoforming, reaction injection moldi
44、ng, pultrusion, open mold or hand lay-up processes. 4.4 POLYMERIC MATERIAL A compound formed by chemical reaction that results in large molecules whose molecular weight is a multiple of that of the original substance (monomer). Includes thermoplastic, thermoset, and elastomeric materials. Polymeric
45、materials are available in different molecular weights and colors, and with different types and quantities of llers, reinforcements, and additives (see 9.9.1). 4.5 REGRIND A noncontaminated product or scrap such as sprues and runners that have been reclaimed by shredding, repelletizing, and granulat
46、ing for use in-house. SEPTEMBER 6, 2012 POLYMERIC MATERIALS SHORT TERM PROPERTY EVALUATIONS - UL 746A 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5 Supplementary Test Procedures 5.1 The requirements in the Standard for Tests for Flammab
47、ility of Plastic Materials for Parts in Devices and Appliances, UL 94, covers ammability of polymeric materials used for parts in devices and appliances. The Standard for Polymeric Materials Long Term Property Evaluations, UL 746B, contains long-term test procedures to be used for the evaluation of
48、materials used for parts intended for specic applications in end products. Test procedures are provided in the Standard for Polymeric Materials Use in Electrical Equipment Evaluation, UL 746C, for the evaluation of polymeric materials in specic applications in end products. The test procedures inclu
49、de reference to the data obtained from the standard property tests in UL 746A, as well as other practical means of evaluation. The Standard for Polymeric Materials Fabricated Parts, UL 746D, contains requirements for traceability and performance of parts molded and fabricated from polymeric materials. 5.2 Programs for the investigation of material part modications, such as the plating of plastics or the use of ame-retardant paints, are contained in the Standard f
