ANSI UL 746D-2018 pdf free download – Polymeric Materials – Fabricated Parts.
1.2 This program is intended to provide quick verification of material identification by means of anidentification marking on the part, or on the carton in which the part is shipped, or in a specification sheetplaced within the shipping carton with the part.This program is intended to eliminate the uncertainty ofthe polymeric material identity in the end-use product and to reduce the possibility of field problemscaused by the use of incorrect compounds.
1.3 The polymeric-material identity program covered by this standard is intended to provide traceabilityfor molded finished parts (that is, enclosures, internal equipment parts,and the like) that are to befactory-installed components of other equipment where the acceptability of the combination is to bedetermined.
1.4 This program is not intended for manufacturing operations that add colorants or other additives toplastic materials using hot-compounding techniques that subject the material to an additional heat historyand ship pellets as finished parts. This program is not intended to provide traceability for polymericmaterials that are intended for field installation.
1.5 Requirements and methods for the evaluation of metallized or painted parts are contained in theStandard for Polymeric Materials – Use in Electrical Equipment Evaluations,UL 746C，and therequirements for Polymeric Materials – Short Term Property Evaluations, UL 746A.Reference should bemade to the applicable individual product standard for performance requirements covering the part orassembly.
2 Glossary
2.1 For the purposes of this Standard the following definitions apply.
2.2 CO-MOLDING – The process of injecting or extruding two or more materials into a single moldusing two or more plasticizing cylinders or through a single dye being fed by separate extruders eithersimultaneously or in sequence.
2.3 FABRICATOR- Performs such finishing operations as machining, drilling, painting, plating,assembly, hot stamping, and the like.
2.4 GENERICALLY -SIMILAR MATERIALS – Materials having the same basic chemical constituentsand structure but differing in the amounts of fillers, modifiers,and/or reinforcements.
2.5 LET-DOWN 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 orconcentrate to the base resin material. The minimum let-down ratio is the lowest permissible proportionby weight of 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.
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). Includesthermoplastic, thermoset, and elastomeric materials.
2.8 RECONSTITUTED PLASTIC – A material made by chemical or thermal breakdown of plasticwaste into components followed by their conversion into a final composition by chemical action.
2.9 RECYCLED PLASTIC BASE COLOR – The color of the recycled resin arising from pigments anddyes 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 recycled in therecycled plastics stream.
2.10 RECYCLED PLASTICS – Those plastics composed of post-consumer material or recoveredmaterial only, or both, that may or may not have been subjected to additional processing steps of thetypes used to make products such as recycled-regrind, or reprocessed or reconstituted plastics.
2.11 RECYCLED PLASTICS STREAM – Plastic pellets incorporating one or more grades of the plasticmaterial 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 beenreclaimed by shredding and granulating for use in-house.
2.13 REPROCESSED PLASTIC – Regrind or recycled-regrind material that has been processed forreuse by extruding and forming into pellets or by other appropriate treatment.
3References
3.1 General
3.1.1 Any undated reference to a code or standard appearing in the requirements of this Standard shallbe 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 andAppliances, UL 94, covers flammability of polymeric materials used for parts in devices and appliances.The Standard for Polymeric Materials – Short Term Property Evaluations, UL 746A, contains short-termtest procedures to be used for the evaluation of materials used for parts intended for specific applicationsin electrical end products. The Standard for Polymeric Materials – Long Term Property Evaluations, UL746B, contains long-term test procedures to be used for the evaluation of materials used for partsintended for specific applications in end products. Test procedures are provided in the Standard forPolymeric Materials – Use in Electrical Equipment Evaluations, UL 746C, for the evaluation of polymericmaterials in specific applications in end products. The test procedures include reference to the dataobtained from the standard property tests in UL 746A, as well as other practical means of evaluation.ANSI UL 746D pdf download.