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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Originally approved in Note This test method is technically identical to ISO where Type D2 specimens are used except that pressure transducers are an option in this test method and required in ISO Each test result is the average of ve individual determinations from successive injection molding cycles.

NOTE 4—Although this specimen may be used to determine mold shrinkage in both the ow and cross ow directions, the lling pattern does not produce uniform ow lengths and orientation. 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.

Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Summary of Test Method 4. The method also accommodates shrinkage at 24 and 48 h, which may be critical for some materials.

Three percent warp is dened as 3 mm depth deection, positive or negative, per mm in length. 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)

Pressure transducers are recommended, but not mandatory for specimens Type A and Type B. For example, thermoplastics, which absorb moisture ast be dried before molding. If the document is revised or amended, you will be notified by email.

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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. Start Webshop Product catalog Product presentation. Intertek PTL molds for a 5″ x 5″ x 0.

Factors, such as the amount of material in charge, cooling ast, and pressure application are known to affect shrinkage signicantly. Determination of Moulding Shrinkage 3.

ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. November 1, 1 Completed ve year review. The length or diameter of the cavity is measured depending on shape of mold. It is typically used to properly machine injection molds so that final part dimensions are as desired. Historical Version s – view previous versions of standard.

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ASTM D955:08(2014)

Link to Active This link will always route to the current Active version of the standard. 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. The minimum hold time can be read from the decrease of the cavity pressure to zero. Orientation effects due to ow direction do not generally pertain to compression molding.

The values given in 9d55-08 are given for information only. Subscription pricing is determined by: The preparation given to the material prior to molding shall be recorded and reported.

ASTM D – Standard Test Method of Measuring Shrinkage from Mold Dimensions of Thermoplastics

c955-08 You need to log in before adding standards to the monitoring service. Factors such as mold and melt temperature, ll times, and packing conditions are known to affect shrinkage signicantly. As the voice of the U. Please first log in with a verified email before subscribing to alerts. 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.

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Record these values as l and w, respectively. Adherence to the specified mold design see 7. Enough resin to mold the required samples. To request a quote for this test or others Click Here.

The correct change-over point shall therefore be adjusted individually for each value of the injection speed and for each material under test. Begin with a short shot to ensure the ow front is straight and not radial and that the ow is laminar and does not exhibit asmt fracture jetting.

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. This standard f955-08 also available to be included in Standards Subscriptions. At point R, the d955-0 of the cav ity pressure at hold is recorded. 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.

Webprint Printed and bound. Mold shrinkage is the shrinkage of the polymer as it cools after the molding process. Standards Subsctiption may be the perfect solution.

Mold Shrinkage ASTM D ISO

We have no amendments or corrections for this standard. You may delete a document from your Alert Profile at any time. Last previous edition approved in as D – 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. As the cooling rate d955-008 the material is proportional to the square of the reciprocal of the thickness, the minimum cooling time for the cavity can be expected to be close to 1.