ANSI UL 746D-2018 UL Standard for Safety Polymeric Materials - Fabricated Parts (Eighth Edition).pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 746D Polymeric Materials Fabricated Parts STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL

2、 NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Polymeric Materials Fabricated Parts, UL 746D Eighth Edition, Dated January 26, 2018 SUMMARY OF TOPICS This new edition of ANSI/UL 746D includes the following changes in requirements: Revis

3、ion of Paragraph 10.3.5 with Respect to UV/Water Test Consideration The revised requirements are substantially in accordance with Proposal(s) on this subject dated December 15, 2017. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical li

4、ne in the margin. All rights 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 o

5、f 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 liable for any special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or an

6、y 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 shall ULs liability for any damage ever exceed the price paid for this Standard, regardless of the form of th

7、e 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 (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is s

8、toring an electronic Standard on the purchasers computer system. JANUARY 26, 2018 UL 746D tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 26, 2018 UL 746D tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER

9、REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL January 26, 2018 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 August, 1974 Second Edition March, 1978 Third Edi

10、tion March, 1980 Fourth Edition May, 1983 Fifth Edition May, 1993 Sixth Edition May, 1998 Seventh Edition December, 2012 Eighth Edition January 26, 2018 This ANSI/UL Standard for Safety consists of the Eighth Edition. The most recent designation of ANSI/UL 746D as an American National Standard (ANSI

11、) occurred on January 26, 2018. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, and Title Page. The Department of Defense (DoD) has adopted UL 746D on November 3, 1998. The publication of revised pages or a new edition of this Standard will not invalidate the DoD ado

12、ption. 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) at https:/. ULs Standards for Safety are copyrighted by UL. Neither a print

13、ed 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 2018 UNDERWRITERS LABORATORIES INC. ANSI/UL 746D-2018UL COPYRIGHTED MATERIAL NOT

14、AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 26, 2018 POLYMERIC MATERIALS FABRICATED PARTS - UL 746D 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scop

15、e .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 .16 10.2 Recycled Plastics with Consistent Identication 18 10.3 Recycled Pl

16、astics without Consistent Identication .19 10.4 Quality Assurance (QA) Program .20 MARKING 11 Details .21 JANUARY 26, 2018 POLYMERIC MATERIALS FABRICATED PARTS - UL 746D 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1

17、.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 the polymeric parts through the handling, molding or fabrication, and ship

18、ping 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 verication of material identication by means of an identication marking on the part

19、, 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-use product and to reduce the possibility of eld problems caused by the use

20、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 to be factory-installed components of other equipment where the acceptabilit

21、y 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 an additional heat history and ship pellets as nished parts. This program i

22、s 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 Materials Use in Electrical Equipment Evaluations, UL 746C, and the requir

23、ements 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 the purposes of this Standard the following denitions apply. 2.2 CO-MOLDING T

24、he 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 FABRICATOR Performs such nishing operations as machining, drilling, painting, plati

25、ng, 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-DOWN RATIO The proportion by weight of additive or concentrate to the base re

26、sin 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 the additive or concentrate to the base resin material. 2.6 MOLDER Performs

27、 injection, extrusion, transfer, compression, rotational, co-molding, thermoforming, reaction injection molding, pultrusion, open mold or hand lay-up processes. JANUARY 26, 2018 POLYMERIC MATERIALS FABRICATED PARTS - UL 746D 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIB

28、UTION 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 thermoplastic, thermoset, and elastomeric materials. 2.8 RECONSTITUTED PLASTIC A m

29、aterial 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 from pigments and dyes that are in the as received resin and prior to any fur

30、ther 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 recycled in the recycled plastics stream. 2.10 RECYCLED PLASTICS Those plastics

31、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 reconstituted plastics. 2.11 RECYCLED PLASTICS STREAM Plastic pellets incorpor

32、ating 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 shredding and granulating for use in-house. 2.13 REPROCESSED PLASTIC Regrind

33、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 the requirements of this Standard shall be interpreted as referring to the l

34、atest 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 materials used for parts in devices and appliances. The Standard for Polymeric Mater

35、ials 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 Polymeric Materials Long Term Property Evaluations, UL 746B, contains long-term t

36、est 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 Evaluations, UL 746C, for the evaluation of polymeric materials in specic applic

37、ations 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. JANUARY 26, 2018 POLYMERIC MATERIALS FABRICATED PARTS - UL 746D 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUC

38、TION 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 additives and colorants, and the blending of two or more materials, are described

39、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 its receipt from the material supplier, through storage, handling, molding, ni

40、shing 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 the part, and the integrity of the marking is intact after all fabrication proc

41、esses. 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 generally is to include the following entries: 1) Name of end-product manufactur

42、er 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. b) Internal Record of Purchase Order Transfers information from purchase orde

43、r 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 (assembly or drawing) number and/or name. 5) Quantity ordered. 6) Date. c) Mate

44、rial 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 name. 2) Material designation. JANUARY 26, 2018 POLYMERIC MATERIALS FABRICATED

45、 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 JANUARY 26, 2018 POLYMERIC MATERIALS FABRICATED PARTS - UL 746D 7UL COPYRIGHTED MATERIAL NOT

46、 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 withdrawals. The following entries are to correlate with like entries on the Mater

47、ial 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 followin

48、g entries are to correlate with like entries on the Material Inventory. The date of withdrawal is to approximate the molding/fabrication date on the Parts Identication. 1) Material manufacturers name or trade name. 2) Material designation. 3) Quantity withdrawn. 4) Date withdrawn. f) Job Card Record

49、s details regarding molding/fabrication of nished parts. The following entries are to correlate with like entries on the Purchase Order, Internal Record of Purchase Order, and Parts Inventory. The date of molding/fabrication is to approximate the molding/ fabrication date on the Parts Identication. 1) Part (assembly or drawing) number and/or name. 2) Internal work order number. See 4.3. 3) Material manufacturers name or trade nam