This specification covers the testing and requirements for two types of compression-molding, thermosetting urea-formaldehyde molding compounds. Type 1 are general purpose molding compounds with alpha-cellulose fillers, while, Type 2 are general purpose molding compounds with cellulose fillers other than alpha-cellulose. The molding compounds shall be of uniform composition, and the apparent density, bulk factor, plasticity, particle size, and color shall be compounded as to conform to the requirements prescribed herein. Also, sampled test specimens shall be examined and conform correspondingly to the following physical requirements: specific gravity; flexural strength; impact resistance; water absorption; dielectric strength; and arc resistance.
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.
1.1 This specification covers compression molding thermosetting, urea-formaldehyde molding compounds as further defined in 3.1.
1.2 The values stated in SI units are to be regarded as the standard.
—The properties included in this specification are those required to identify the types of molding compounds covered. There may be other requirements necessary to identify particular characteristics. Transfer or injection molding will usually result in different physical and electrical characteristics than compression molding.
1.3 The following safety hazards caveat pertains only to the test method portion, Section 7, of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
—ISO 2112-1977(E) is similar but not equivalent to this specification. Product classification and characterization are not the same.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies
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
D790 Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials
D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
D956 Practice for Compression Molding Specimens of Amino Molding Compounds
D3892 Practice for Packaging/Packing of Plastics
ISO2112-1977(E) Plastics--Aminoplastic Moulding Materials--Specification Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036.
formaldehyde; molding compounds (thermosetting); urea-formaldehyde ;
ICS Number Code 83.140.99 (Other rubber and plastic products)
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