ASTM D955-08 PDF
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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The mold shall have at one end a gate 6.
The preparation given to the material prior to molding shall be recorded and reported. We have no amendments or corrections for this standard. To request a quote for this test or others Click Here. Determination of Moulding Shrinkage 3.
The parts cool and after 48 hours, the molded parts are measured and the shrinkage is calculated. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. A superscript epsilon indicates an editorial change since the last revision or reapproval.
Mold Shrinkage ASTM D ISO
Historical Version s – view previous versions of standard. As the cooling rate of the material is proportional to the square of the reciprocal of the thickness, the minimum cooling time for the cavity can be expected to awtm close to 1.
Each test result is the average of ve individual determinations from successive injection molding cycles.
There are no recognized standards by which to estimate the bias of this test method. Precision and Bias Mold shrinkage is the shrinkage of the polymer as it cools after the molding process.
Differences in mold shrinkage may also be observed among the three specimen geometries described in this test method. You need to log in before adding standards to the monitoring service. The minimum hold time can be read from the decrease of the cavity pressure to zero.
Summary of Test Method 4. Test specimens are molded under specified conditions. Due to copyright axtm, we are not able to provide copies of standards. This standard is also available to be included in Standards Subscriptions. The data in Tables 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.
ASTM D955 – 08(2014)
November 1, 1 Completed ve year review. Do not modify or alter the edges used for the measurement of dimensions.
Adherence to the specied mold design see 7. You may delete a document from your Alert Profile at any time. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn.
It would be incorrect to assume values form Tables for any new material. Injection Molds Digital micrometers Digital calipers Weighted digital drop gauge. 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.
The decrease in the cavity pressure at aztm to zero indicates that the material in the gate has solidied sufficiently to stop ow into the cavity. Mold shrinkage can be dependant upon the molding parameters used – often the extremes of the processing range for the material plus a axtm value are tested.
Standards monitoring is a free service designed for you who wish to be alerted of changes to or new editions of the standards zstm in your work.
A web subscription provides an easy and secure access to standards, and you are guaranteed to always have the latest edition. Report mold shrinkage in both ow and cross direction to two signicant gures. Thus the mass of material injected into the cavity is not clearly dened and the orientation of the material near the gate will be perturbed. Monitoring Standards monitoring is a free service designed for you who wish to be alerted of changes to or new editions of the standards required in your work.
Each laboratory obtained one test result for each material. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards.