UL 746A
Standard for Polymeric Materials - Short Term Property Evaluations

DETAILS
Edition Number:6SCC Approved:--
Edition Date:2012-09-06DOD Approved: 1988-11-03
Price Code:AANSI Approved: 2017-09-15
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover short-term test procedures to be used for the evaluation of materials used for parts intended for specific 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, flammability, thermal, and other properties of the materials under 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 by the requirements in this standard, and that involves a risk of fire 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 whose features, characteristics, components, materials, or systems conflict with specific 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 implementation of this standard.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 Units of Measurement
          • 3 References
          • 4 Glossary
          • 5 Supplementary Test Procedures
          • 6 Alternate or Equivalent Test Methods
          • 7 Characteristics of Polymeric Materials
          • 8 Use of Polymeric Materials
          • 9 General
            • 9.1 Selection of samples and test specimens
            • 9.2 Preparation of specimens
            • 9.3 Thickness and directional properties
            • 9.4 Treatment prior to test
            • 9.5 Testing conditions
            • 9.6 Testing for temperature effects
            • 9.7 Apparatus
            • 9.8 Results of tests
            • 9.9 Polymer variations
        • TESTING FOR MECHANICAL PROPERTIES
          • 10 Tensile Properties of Thermoplastic Polymeric Materials
          • 11 Tensile Properties of Elastomers
          • 12 Tensile Properties of Thin Polymeric Sheeting
          • 13 Izod Impact Test
          • 14 Tensile Impact Test
          • 15 Charpy Impact Test
          • 16 Flexural Properties of Polymeric Materials
          • 17 Shear Properties of Polymeric Materials
          • 18 Bond Strength of Plated Polymeric Materials
            • 18.1 General
            • 18.2 Conditioning
            • 18.3 Test procedure
            • 18.4 Calculations
            • 18.5 Report
          • 19 Bond-Strength Properties of Adhesives
            • 19.1 General
            • 19.2 Method A – shear strength by tension loading
            • 19.3 Method B – tensile strength by bar and rod samples
            • 19.4 Method C – peel strength by u-bend samples
            • 19.5 Method D – peel strength by climbing drum apparatus
            • 19.6 Method E – peel resistance by T samples
          • 20 Indentation Hardness of Rubber and Plastics by Means of a Durometer
        • TESTING FOR ELECTRICAL PROPERTIES
          • 21 AC (Alternate Current) Dielectric Breakdown Voltage and Strength
          • 21A DC (Direct Current) Dielectric Breakdown Voltage and Strength
          • 22 D-C Resistance or Conductance of Insulating Materials
          • 23 High-Voltage, Low Current, Dry Arc Resistance Performance Level Categories of Solid Electrical Insulation
          • 24 Comparative Tracking Index and Comparative Tracking Performance Level Categories of Electrical Insulation Materials
          • 25 High-Voltage Arc-Tracking-Rate Performance Level Categories of Solid Insulating Materials
            • 25.1 General
            • 25.2 Apparatus
            • 25.3 Specimens
            • 25.4 Test procedure
            • 25.5 Report
          • 26 Liquid Contaminant, Inclined-Plane Tracking, and Erosion of Insulating Materials
        • MATERIAL DISTORTION UNDER LOAD
          • 27 Deflection Temperature of Polymeric Materials under Load
            • 27.1 General
          • 28 Vicat Softening Point for Polymeric Materials
          • 29 Softening Point by Ring-and-Ball Apparatus
          • 30 Ball Pressure Test
            • 30.1 General
            • 30.2 Test procedure
        • RESISTANCE TO IGNITION OF POLYMERIC MATERIALS
          • 31 General
          • 32 Hot Wire Ignition – Performance Level Categories
            • 32.1 General
          • 33 High-Current Arc Ignition Performance Level Categories
            • 33.1 General
            • 33.2 Apparatus
            • 33.3 Specimen
            • 33.4 Test procedure
            • 33.5 Report
          • 34 High-Voltage Arc Resistance to Ignition Performance Level Categories
            • 34.1 General
            • 34.2 Apparatus
            • 34.3 Specimens
            • 34.4 Test procedure
            • 34.5 Report
          • 35 Glow-Wire Ignition Temperature Test (GWIT)
            • 35.1 General
            • 35.2 Significance
            • 35.3 Apparatus
            • 35.4 Specimens
            • 35.5 Conditioning
            • 35.6 Procedure
            • 35.7 Report
        • DIMENSIONAL CHANGE OF POLYMERIC PARTS
          • 36 General
          • 37 Method for Measuring Changes in Linear Dimensions of Polymeric Materials
          • 38 Method for Measuring Water Absorption of Polymeric Materials
        • RESISTANCE OF POLYMERIC MATERIALS TO CHEMICAL REAGENTS
          • 39 Test for Resistance of Polymeric Materials to Chemical Reagents
        • TESTS FOR POLYMER IDENTIFICATION
          • 40 General
          • 41 Specific Gravity of Polymers
          • 42 Density Determination of Foamed Polymeric Materials
          • 43 Infrared Spectroscopy
            • 43.1 General
            • 43.2 Sample preparation
            • 43.3 Report
          • 44 Determination of Ash Content
            • 44.1 General
            • 44.2 Materials and equipment
            • 44.3 Test procedure
            • 44.4 Calculations
            • 44.5 Report
          • 45 Pyrolytic Gas Chromatography
            • 45.1 General
            • 45.2 Instrumentation
            • 45.3 Report
          • 46 Thermogravimetry
          • 47 Differential Scanning Calorimetry
        • REGRIND
          • 48 Regrind of Thermoplastic Polymeric Materials
            • 48.1 General
            • 48.2 Preparation of regrind specimens
            • 48.3 Separate investigations of regrind thermoplastic materials
        • TESTING FOR COMBUSTIBILITY PROPERTIES OF POLYMERIC MATERIALS
          • 48A Microscale Combustion Calorimetry
        • MARKING
          • 49 General
    • FOLLOW-UP INSPECTION INSTRUCTIONS
    • APPENDIX A
    • APPENDIX B
    • APPENDIX C
    • APPENDIX D