ASTM D5948-05(2012) - 1.10.2012
 
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).

Resin

Phenolic, cellulose filled

Phenolic, mineral/glass filled

Melamine

Polyester

Diallyl iso-phthalate

Diallyl ortho-phthalate

Silicone

Epoxy


Note 1—There is no equivalent ISO 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.

 
2. Referenced Documents

D229-26

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

D495-22

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

E994-95

Standard Guide for Calibration and Testing Laboratory Accreditation Systems General Requirements for Operation and Recognition (Withdrawn 2004)

D4697-95(2001)

Standard Guide for Maintaining Test Methods in the User's Laboratory (Withdrawn 2009)

D4350-16(2022)

Standard Test Method for Corrosivity Index of Plastics and Fillers

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.

E1224-94

Standard Guide for Categorizing Fields of Capability for Laboratory Accreditation Purposes (Withdrawn 2002)

UL 94

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

D618-21

Standard Practice for Conditioning Plastics for Testing

D638-22

Standard Test Method for Tensile Properties of Plastics

D648-18

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

D149-25

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

D150-22

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

D570-22

Standard Test Method for Water Absorption of Plastics

D256-26

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

D695-26

Standard Test Method for Compressive Properties of Rigid Plastics

D790-25

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

D796-87A

Practice for Compression Molding Test Specimens of Phenolic Molding Compounds (Withdrawn 1992)

D883-26a

Standard Terminology Relating to Plastics (Includes all amendments and changes 6/15/2026).

D1896-09

Standard Practice for Transfer Molding Test Specimens of Thermosetting Compounds

D3419-12(2019)

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

D3636-24

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

D3638-21e1

Standard Test Method for Comparative Tracking Index of Electrical Insulating Materials (Includes all amendments and changes 2/2/2022).