Scope: Mold shrinkage is the shrinkage of the polymer as it cools after the molding process. It is typically used to properly machine injection molds so that final. Purchase your copy of ASTM D – 08() as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards. Buy ASTM D R TEST METHOD OF MEASURING SHRINKAGE FROM MOLD DIMENSIONS OF THERMOPLASTICS from SAI.
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Start Webshop Product catalog Product presentation. Test specimens are molded under specified conditions. The parts cool and after 48 hours, the molded parts are measured and the shrinkage is calculated. Record these values as l and w, respectively. To request a quote for this test or others Click Here. It is recommended to cool specimens in a horizontal position at room temperature by placing them on a material of low thermal conductivity to minimize warpage.
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ASTM D – 08 Standard Test Method of Measuring Shrinkage from Mold Dimensions of Thermoplastics
Each test result is the average of ve individual determinations from successive injection molding cycles. The data in Axtm should not be rigorously applied to acceptance or rejected of material, as those data are specic to the round robin and may not be representative of other lots, conditions, materials, or laboratories.
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.
Standards Subscriptions from ANSI sstm a money-saving, multi-user solution for accessing standards. NOTE 2—Although scribe marks are not required, if they are used for injection or compression molded specimens for the measurement of shrinkage, the scribe marks shall be 1.
Mold Shrinkage ASTM D ISO
Your comments are r955-08 either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Collect samples after the machine is at equilibrium. Historical Version s – view previous versions of standard.
Pressure transducers are recommended, but not mandatory for specimens Type A and Type B. As the voice of the U. The decrease in the cavity pressure at hold to zero indicates that the material in the gate has solidied sufficiently to stop ow into the cavity.
Differences in mold shrinkage may also be observed among the three specimen geometries described in this test method.
A superscript epsilon indicates an editorial change since the last revision or reapproval. It would be incorrect to assume values form Tables for any new material. Subscription – always available and updated A web subscription provides an easy and secure access to standards, and you are guaranteed to always have the latest edition.
D – D The values given in parentheses are given for information only. This service is not available if you are a URL user where you d955-80 not log in with an email address.
Astmm standard and ISO are equivalent in the design of specimen D2. Link to Active This link will always route to the current Active version of the standard. You need to log in before adding standards to the monitoring service.
Originally approved in Report mold shrinkage in both ow and cross direction to two signicant gures. We have no amendments or corrections for this standard. Due to copyright restrictions, we are not able to provide copies of standards.
Orientation effects due to ow direction do not generally pertain to compression molding. If you need to be able to add standards to the monitoring service, you must register as a user with your own username and password. Standards can be obtained from appropriate standards authorities. Factors, such as the amount of material in charge, cooling time, and pressure application are known to affect shrinkage significantly. Enough resin to mold the required samples. Factors such as mold and melt temperature, fill times, and packing conditions are known to affect shrinkage significantly.
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This standard is not included in any packages. The preparation given to v955-08 material prior to molding shall be recorded and reported. Intermediate values may also be used, however. Differences in mold shrinkage may axtm be observed between the three specimen geometries described in this test method.
The benefits of a subscription: Mold shrinkage is the shrinkage of the polymer as it cools after the molding process. Signicance and Use 5. The thickness shall be 3. Last previous edition approved in as D –