1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 746D Polymeric Materials Fabricated PartsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR
2、FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Polymeric Materials Fabricated Parts, UL 746D Seventh Edition, Dated December 20, 2012 SUMMARY OF TOPICS These revisions to ANSI/UL 746D include the following changes in requirements: Revision in Recycled Plas
3、tics Section 10.3.3 (g) to reect ignition test (GWIT) The revised requirements are substantially in accordance with Proposal(s) on this subject dated June 13, 2014. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin.
4、Changes in requirements are marked with a vertical line in the margin and are followed by an effective date note indicating the date of publication or the date on which the changed requirement becomes effective. All rights reserved. No part of this publication may be reproduced, stored in a retrieva
5、l 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 or implied, including but not limited to, the implied warranties of merchanta
6、bility or tness for any purpose. In no event will UL be liable 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 authoriz
7、ed UL representative has been advised of the possibility of 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
8、 UL harmless from and against any loss, expense, liability, 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. The requirements in this Standard are now
9、 in effect, except for those paragraphs, sections, tables, gures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. The prior text for requirements that have been revised and that have a future effective date are located after t
10、he Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. DECEMBER 10, 2014 UL 746D tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 10, 2014 UL 746D tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURT
11、HER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL December 20, 2012 (Title Page Reprinted: December 10, 2014) 1 UL 746D Standard for Polymeric Materials Fabricated Parts The rst edition was titled Molded Plastic Parts for Use in Devices and Equipment and numbered UL 746.4. First Edition Au
12、gust, 1974 Second Edition March, 1978 Third Edition March, 1980 Fourth Edition May, 1983 Fifth Edition May, 1993 Sixth Edition May, 1998 Seventh Edition December 20, 2012 This ANSI/UL Standard for Safety consists of the Seventh Edition including revisions through December 10, 2014 The most recent de
13、signation of ANSI/UL 746D as an American National Standard (ANSI) occurred on December 9, 2014. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. Any other portions of this ANSI/UL standard that were not processed in accordanc
14、e with ANSI/UL requirements are noted at the beginning of the impacted sections. Comments or proposals for revisions on any part 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) a
15、t 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 rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2014 UND
16、ERWRITERS LABORATORIES INC. ANSI/UL 746D-2014UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 20, 2012 POLYMERIC MATERIALS FABRICATED PARTS - UL 746D 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTI
17、ON OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .4 2 Glossary .4 3 References .5 3.1 General .5 3.2 Related Standards 5 4 Details .6 MATERIAL MODIFICATIONS 5 Additives 10 6 Rework .11 7 Combined Resins 11 8 Regrinds 13 9 Co-Molding 14 10 Recycled Plastic 16 10.1 General .
18、16 10.2 Recycled Plastics with Consistent Identication 18 10.3 Recycled Plastics without Consistent Identication .19 10.4 Quality Assurance (QA) Program .20 MARKING 11 Details .20 DECEMBER 20, 2012 POLYMERIC MATERIALS FABRICATED PARTS - UL 746D 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REP
19、RODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover a program applicable to parts that have been molded or fabricated from polymeric material and describe the material-identity control system intended to provide traceability of the material used for
20、 the polymeric parts through the handling, molding or fabrication, and shipping operations. Guidelines are also provided for acceptable blending or simple compounding operations that may affect risk of re, electrical shock, or injury to persons. 1.2 This program is intended to provide quick vericati
21、on of material identication by means of an identication marking on the part, or on the carton in which the part is shipped, or in a specication sheet placed within the shipping carton with the part. This program is intended to eliminate the uncertainty of the polymeric material identity in the end-u
22、se product and to reduce the possibility of eld problems caused by the use of incorrect compounds. 1.3 The polymeric-material identity program covered by this standard is intended to provide traceability for molded nished parts (that is, enclosures, internal equipment parts, and the like) that are t
23、o be factory-installed components of other equipment where the acceptability of the combination is to be determined. 1.4 This program is not intended for manufacturing operations that add colorants or other additives to plastic materials using hot-compounding techniques that subject the material to
24、an additional heat history and ship pellets as nished parts. This program is not intended to provide traceability for polymeric materials that are intended for eld installation. 1.5 Requirements and methods for the evaluation of metallized or painted parts are contained in the Standard for Polymeric
25、 Materials Use in Electrical Equipment Evaluations, UL 746C, and the requirements for Polymeric Materials Short Term Property Evaluations, UL 746A. Reference should be made to the applicable individual product standard for performance requirements covering the part or assembly. 2 Glossary 2.1 For th
26、e purposes of this Standard the following denitions apply. 2.2 CO-MOLDING The process of injecting or extruding two or more materials into a single mold using two or more plasticizing cylinders or through a single dye being fed by separate extruders either simultaneously or in sequence. 2.3 FABRICAT
27、OR Performs such nishing operations as machining, drilling, painting, plating, assembly, hot stamping, and the like. 2.4 GENERICALLY SIMILAR MATERIALS Materials having the same basic chemical constituents and structure but differing in the amounts of llers, modiers, and/or reinforcements. 2.5 LET-DO
28、WN RATIO The proportion by weight of additive or concentrate to the base resin material. The maximum let-down ratio is the highest permissible proportion by weight of the additive or concentrate to the base resin material. The minimum let-down ratio is the lowest permissible proportion by weight of
29、the additive or concentrate to the base resin material. 2.6 MOLDER Performs injection, extrusion, transfer, compression, rotational, co-molding, thermoforming, reaction injection molding, pultrusion, open mold or hand lay-up processes. DECEMBER 20, 2012 POLYMERIC MATERIALS FABRICATED PARTS - UL 746D
30、 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.7 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 thermo
31、plastic, thermoset, and elastomeric materials. 2.8 RECONSTITUTED PLASTIC A material made by chemical or thermal breakdown of plastic waste into components followed by their conversion into a nal composition by chemical action. 2.9 RECYCLED PLASTIC BASE COLOR The color of the recycled resin arising f
32、rom pigments and dyes that are in the as received resin and prior to any further addition of pigments or dyes. For example, the base color of a recycled plastics resin can be gray or black with the actual color depending on the distribution of pigments and dyes given the multiple plastics being recy
33、cled in the recycled plastics stream. 2.10 RECYCLED PLASTICS Those plastics composed of post-consumer material or recovered material only, or both, that may or may not have been subjected to additional processing steps of the types used to make products such as recycled-regrind, or reprocessed or re
34、constituted plastics. 2.11 RECYCLED PLASTICS STREAM Plastic pellets incorporating one or more grades of the plastic material that has been recovered from post-consumer or post-industrial sources. 2.12 REGRIND A noncontaminated product or scrap such as sprues and runners that have been reclaimed by s
35、hredding and granulating for use in-house. 2.13 REPROCESSED PLASTIC Regrind or recycled-regrind material that has been processed for reuse by extruding and forming into pellets or by other appropriate treatment. 3 References 3.1 General 3.1.1 Any undated reference to a code or standard appearing in
36、the requirements of this Standard shall be interpreted as referring to the latest edition of that code or standard. 3.2 Related Standards 3.2.1 The requirements in Standard Tests for Flammability of Plastic Materials for Parts in Devices and Appliances, UL 94, covers ammability of polymeric material
37、s used for parts in devices and appliances. The Standard for Polymeric Materials Short Term Property Evaluations, UL 746A, contains short-term test procedures to be used for the evaluation of materials used for parts intended for specic applications in electrical end products. The Standard for Polym
38、eric Materials Long Term Property Evaluations, UL 746B, contains long-term test procedures to be used for the evaluation of 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 Eval
39、uations, UL 746C, for the evaluation of polymeric materials in specic applications in end products. The test procedures include reference to the data obtained from the standard property tests in UL 746A, as well as other practical means of evaluation. DECEMBER 20, 2012 POLYMERIC MATERIALS FABRICATED
40、 PARTS - UL 746D 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3.2.2 Requirements for materials that have been modied to match the requirements of a specic application, including the use of recycled and regrind materials, the use of addit
41、ives and colorants, and the blending of two or more materials, are described in this Standard. 4 Details 4.1 The molder/fabricator of the polymeric-material parts shall maintain records that facilitate tracing the identity of the polymeric material used in the molding/fabrication of the parts from i
42、ts receipt from the material supplier, through storage, handling, molding, nishing operations, and shipping. See Figure 4.1. Exception: Records covering subcontracted fabrication processes are not required if the markings described in Details, Section 11 are permanently molded into, or applied to th
43、e part, and the integrity of the marking is intact after all fabrication processes. 4.2 The following is an example of the records that may be maintained by the molder/fabricator to comply with the requirements in 4.1. a) Purchase Order Orders part or assembly from a molder/fabricator. This form gen
44、erally is to include the following entries: 1) Name of end-product manufacturer or designated party (consignee). 2) Purchase order number. 3) Part (assembly or drawing) number and/or name. This item is to specify the material to be used for production of the component. 4) Quantity ordered. 5) Date.
45、b) Internal Record of Purchase Order Transfers information from purchase order to molders/ fabricators in-house records. This form is to include the following entries: 1) Name of end-product manufacturer or designated party. 2) Purchase order number. 3) Internal work order number. See 4.3 4) Part (a
46、ssembly or drawing) number and/or name. 5) Quantity ordered. 6) Date. c) Material Delivery Receipt Records receipt of material from which nished parts are molded/ fabricated. The following entries are to correlate with like entries on the Material Inventory: 1) Material manufacturers name or trade n
47、ame. 2) Material designation. DECEMBER 20, 2012 POLYMERIC MATERIALS FABRICATED PARTS - UL 746D 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Figure 4.1 Example of a material-identity control system as described in section 4 DECEMBER 20, 2
48、012 POLYMERIC MATERIALS FABRICATED PARTS - UL 746D 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3) Quantity delivered. 4) Date delivered. d) Material Inventory (See 4.6) Records quantity of material in storage as well as receipts and wit
49、hdrawals. The following entries are to correlate with like entries on the Material Delivery Receipt and Material Draw: 1) Material manufacturers name or trade name. 2) Material designation. 3) Quantity delivered. 4) Date delivered. 5) Quantity withdrawn. 6) Date withdrawn. e) Material Draw Records withdrawal of material from inventory for part molding/fabrication. The following entries are to correlate with like entries on the Mater
