Home>ASTM Standards>ASTM D705-99(R2020) pdf free download

ASTM D705-99(R2020) pdf free download

ASTM D705-99(R2020) pdf free download.Standard Specification for Urea-Formaldehyde Molding Compounds
1. Scope
1.1 This specification covers compression molding thermosetting, urea-formaldehyde molding compounds as fur- ther defined in 3.1. 1.2 The values stated in SI units are to be regarded as the standard. N OTE 1—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 ofthe safety concerns, ifany, associated with its use. It is the responsibility ofthe user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. N OTE 2—ISO 2112-1977(E) is similar but not equivalent to this specification. Product classification and characterization are not the same. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Classification
3.1 The molding compounds covered by this specification shall be designated by types, based upon their principal characteristics and the fillers used. 3.1.1 Type 1—A general purpose molding compound with alpha-cellulose filler. 3.1.2 Type 2—A general purpose molding compound with cellulose filler other than alpha-cellulose.
4. General Requirements
4.1 The molding compounds shall be of uniform composi- tion. The apparent density, bulk factor, plasticity, particle size, and color shall be compounded as to conform to the require- ments prescribed in this specification.
5. Detail Requirements
5.1 Test specimens molded in accordance with Practice D956 shall conform to the requirements prescribed in Table 1.
6. Sampling
6.1 A batch of molding compound shall be considered as a unit of manufacture as prepared for shipment and may consist of a blend of two or more production runs.
7. Test Methods
7.1 The properties enumerated in this specification shall be determined in accordance with the following methods: 7.1.1 Conditioning Test Specimens—Molded test specimens shall be conditioned in accordance with Procedure B of Practice D618, except for the tests for arc resistance and dielectric strength, where Procedure A shall be used. 7.1.2 Test Conditions—Tests shall be conducted in the standard laboratory atmosphere of 23 6 1°C and 50 6 2 % relative humidity, unless otherwise specified in the testing methods or in this specification. 7.1.3 Specific Gravity—Method A of Test Methods D792. 7.1.4 Flexural Strength—Test Methods D790, Procedure A, Method I, using a 6.4 by 12.7 by 127-mm bar tested parallel to molding pressure. 7.1.5 Impact Resistance (Izod)—Method A of Test Methods D256, using a specimen measuring 12.7 by 12.7 by 63.5 mm and notched on the side parallel to the direction of molding pressure. 7.1.6 Water Absorption—Test Method D570, using the 24-h immersion procedure. 7.1.7 Dielectric Strength—Test Methods D149, except that the test specimens shall be compression-molded disks or plates 3.2 mm in thickness. 7.1.8 Arc Resistance—Test Method D495, using tungsten rod electrodes.
8. Packaging and Package Marking
8.1 Packaging—The compound shall be packaged in stan- dard commercial containers, so constructed as to ensure acceptance by common or other carriers for safe transportation at the lowest rate to the point of delivery. 8.2 Package Marking—Shipping containers shall be marked with the name of the compound, type, color, and the quantity contained therein, as defined by the contract or order under which shipment is made, the name ofthe manufacturer, and the number of the contract or order. 8.3 All packing, packaging, and marking provisions of Practice D3892 shall apply to this specification.

Maybe you like

Standards Tags