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    ASTM D5948 - 05(2020)

    Standard Specification for Molding Compounds, Thermosetting

    Active Standard ASTM D5948 | Developed by Subcommittee: D20.16

    Book of Standards Volume: 08.03

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    This specification covers the basic properties of thermoset molding plastic compounds and the test methods used to establish the properties. The plastic compounds shall be a resin, cellulose-filled or mineral/glass-filled phenolic, melamine, polyester, diallyl iso-phthalate, diallyl ortho-phthalate, silicone, or epoxy. Standard test specimens shall be in the as-received condition or shall be conditioned before testing by humidity, immersion, or temperature conditioning. The specimens shall undergo mechanical or physical qualification tests which shall conform to the following properties: compressive strength; dimensional stability; flexural strength; heat deflection temperature; heat resistance; impact strength; tensile strength; and water absorption. Electrical qualification tests shall be conducted; wherein, the specimens shall comply with the following requirements: arc resistance; dielectric breakdown; dielectric constant; dielectric strength; dissipation factor; surface resistance; comparative track index; volume resistance; and water extract conductance. Tests for combustion qualification shall also be performed to determine the flame resistance ignition time, burning time, flammability, and toxicity requirements. Batch acceptance tests shall be conducted as well to ensure the quality conformance of the specimens.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    Significance and Use

    4.1 This specification is a revision of STD MIL-M-14H, Specification for Molding Compound, Thermosetting, retaining the MIL-M-14H material designations and property requirements while conforming to ASTM form and style. It is intended for qualification and batch acceptance for materials used by government and industry, and is intended as a direct replacement for MIL-M-14H.

    1. Scope

    1.1 This specification covers the basic properties of thermoset molding compounds and the test methods used to establish the properties.

    1.2 Classification—Molding thermosetting plastic compounds shall be of the following resins and are covered by the individual specification sheets (see 5.1 and Annex A1 – Annex A8).


    Phenolic, cellulose filled

    Phenolic, mineral/glass filled



    Diallyl iso-phthalate

    Diallyl ortho-phthalate



    Note 1: There is no known ISO equivalent to this standard.

    1.3 Order of Precedence—In the event of a conflict between the text of this specification and the references cited in Section 2 (except for related specification sheets), the text of this specification takes precedence. Nothing in this specification, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

    1.4 The values stated in SI units are to be considered standard.

    1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies

    D150 Test Methods for AC Loss Characteristics and Permittivity (Dielectric Constant) of Solid Electrical Insulation

    D229 Test Methods for Rigid Sheet and Plate Materials Used for Electrical Insulation

    D256 Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics

    D495 Test Method for High-Voltage, Low-Current, Dry Arc Resistance of Solid Electrical Insulation

    D570 Test Method for Water Absorption of Plastics

    D618 Practice for Conditioning Plastics for Testing

    D638 Test Method for Tensile Properties of Plastics

    D648 Test Method for Deflection Temperature of Plastics Under Flexural Load in the Edgewise Position

    D695 Test Method for Compressive Properties of Rigid Plastics

    D790 Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials

    D796 Practice for Compression Molding Test Specimens of Phenolic Molding Compounds

    D883 Terminology Relating to Plastics

    D1896 Practice for Transfer Molding Test Specimens of Thermosetting Compounds

    D3419 Practice for In-Line Screw-Injection Molding Test Specimens From Thermosetting Compounds

    D3636 Practice for Sampling and Judging Quality of Solid Electrical Insulating Materials

    D3638 Test Method for Comparative Tracking Index of Electrical Insulating Materials

    D4350 Test Method for Corrosivity Index of Plastics and Fillers

    D4697 Guide for Maintaining Test Methods in the Users Laboratory

    E994 Guide for Calibration and Testing Laboratory Accreditation Systems General Requirements for Operation and Recognition

    E1224 Guide for Categorizing Fields of Capability for Laboratory Accreditation Purposes

    Underwriters Laboratory Standard

    UL 94 Tests for Flammability of Plastic Materials for Parts in Devices and Appliances

    Other Standard

    DDC AD 297457 Procedure for Determining Toxicity of Synthetic Compounds Available from National Technical Information Service (NTIS), U.S. Department of Commerce, 5285 Port Royal Rd., Springfield, VA 22161.

    ICS Code

    ICS Number Code 83.040.01 (Raw materials for rubber and plastics in general)

    UNSPSC Code

    UNSPSC Code 13111001(Epoxy); 13111002(Phenolic resin)

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/D5948-05R20

    Citation Format

    ASTM D5948-05(2020), Standard Specification for Molding Compounds, Thermosetting, ASTM International, West Conshohocken, PA, 2020, www.astm.org

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