Flow of Low-Pressure Thermosetting Molding Compounds. Article no: STD- Edition: Approved: 9/1/ No of pages: 4. Replaces: ASTM D ASTM-D Standard Test Method for Spiral Flow of Low-Pressure Thermosetting Molding Compounds – spiral flow; thermosets;; ICS Number Code Standard Number, ASTM D – 09(). Title, Standard Test Method for Spiral Flow of Low-Pressure Thermosetting Molding Compounds.
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D — 09 Standard Test Method for Spiral Flow of Low-Pressure Thermosetting Molding Compounds1 This standard is issued under the fixed designation D; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. It is especially suited for those compounds used for encapsulation or other low pressure molding techniques.
It involves the use of a standard spiral flow mold in a transfer molding press under specified conditions of applied temperature and satm with a controlled charge c3123. 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.
Current edition approved Sept. Astmm approved in Last previous edition approved in as D – 98 Significance asrm Use 4. It is recommended that the plunger be equipped with at least one peripheral sealing groove. It is recommended that a pot diameter between NOTE 2—Preliminary evidence indicates that, in many cases, reasonable correlations may be achieved between laboratories using presses with different pot diameters.
Typical examples are presses with pot diameters of However, a few well-documented cases are recorded where differences in pot diameters, even within this listed range, have caused large differences in flow-length readings. Therefore, for best interlaboratory correlation it d3132 recommended that identical pot diameters be used.
Spiral Flow of Low-Pressure Thermosetting Molding Compounds1
No further reproductions authorized. D — 09 FIG. NOTE 3—Since the only commercially available molds are calibrated in inches, spiral-flow length will be reported in these units. Conversion to SI units can readily be made by multiplying the flow length, in inches, by the appropriate conversion factor, NOTE 4—There is considerable evidence that the test is usable over a wider range of flow lengths, but this has not yet been confirmed by interlaboratory testing.
NOTE 5—Preforms or pellets may be used if found necessary; however, flow length may be affected by their use. Sampling, based on engineering principles, prior to packaging shall be considered an acceptable alternative. For referee testing, all material shall be shipped and stored in moisture-barrier containers. They shall be stored for a minimum of 24 h at the standard laboratory temperature, before breaking the seal on the container.
Alternative methods of conditioning samples shall be mutually agreed upon between manufacturer and purchaser. Several preliminary moldings shall be made with the material to be tested to purge the helical runner before beginning the test. This procedure is essential when changing from one compound to another and is recommended as a routine practice. Measure the temperature in accordance with the procedures described in Practice D or by thermocouples attached to the mold and plunger.
The temperature shall be allowed to reach equilibrium by waiting at least 3 min between moldings. D — 09 sufficiently accurate for determining transfer pressure. Therefore, the force exerted by the plunger shall be measured by some means such as an accurately calibrated direct-reading force gage or proving ring.
Standard Test Method for Spiral Flow of Low-Pressure Thermosetting Molding Compounds
The actual transfer pressure is then calculated as pascals or pounds per square inch by dividing the force in newtons or pounds-force by the plunger area in square metres or square inches.
Atsm relationship between the amount of compound and the dimensions of the transfer pot is critical in obtaining meaningful, reproducible spiral-flow values.
The use of excessive amounts of compound will result in shorter, inconsistent spiral flows. For transfer pots The elapsed time between insertion of the charge into the pot and the development of pressure on the charge by the plunger shall be no more than 5 seconds. Too long a dwell time before transferring will cause erratic results. This time will vary with the compound under test. Cure the compound as recommended for easy removal. Read the spiral flow length directly from the molded specimen at the point of farthest continuous flow to the nearest 0.
Precision and Bias Attempts to develop a full precision and bias statement for this test method have not been successful. For this reason, data on precision and bias cannot be given. Because this test method does not contain a round-robin-based numerical precision and bias statement, it shall not be used as a referee test method in case of dispute.
Anyone wishing to participate in the development of precision and bias data should contact the Chairman, Subcommittee D September 1, 1 Updated ISO equivalency statement.
ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn. Atm comments are invited either for revision of this standard or for additional standards d31123 should be addressed to ASTM International Headquarters.
Spiral Flow – Neu Dynamics Corporation
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