MaTestLab > Test Standards > ASTM D955 Standard Test Method of Measuring Shrinkage from Mold Dimensions of Thermoplastics

ASTM D955 Standard Test Method of Measuring Shrinkage from Mold Dimensions of Thermoplastics

ASTM D955 test procedure aims to identify the shrinkage of thermoplastics when they are molded by means of compression or injection methods under specific processing conditions. Shrinkage measurements are recorded at 24 and 48 hours. The ASTM D955 test provides comparable data on standard specimens but cannot predict absolute values in molded parts with varying flow paths, wall thicknesses, pressure gradients, and conditions. Results of the ASTM D955 test are stated in SI units as they are considered standard units.

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Introduction to ASTM D955ASTM D955 is based upon the basic principle of comparing the dimensions of the mold cavity with those of the specimen and reports the percentage differences of each of their dimensions. The ASTM D955 test method is widely applicable in terms of quality control, cost-effectiveness, material selection, and compliance with industry standards and regulations. The ASTM D955 test method provides comparable data based on standard specimens and can not predict absolute values in actual molded parts with varying flow paths, wall thicknesses, pressure and temperature gradients and process conditions. Differences in mold shrinkage may also be observed among the three specimen geometries described in the ASTM D955 test method.Test Procedure of ASTM D955

Test Setup and ExecutionASTM D955 is executed by measuring the length and width of the mold at 0.025 mm at 23°C and 50% relative humidity. The heating cylinder and mold temperature are kept within the material molding standard range. Flow for straightness, laminarity, and melt fracture is measured.

ASTM D955 Test Specimens 

Specimen PreparationASTM D955 specifies that before molding, some specimens needed special treatment. For instance, thermoplastics must be dried before molding since they absorb moistureSpecimen DimensionsASTM D955 indicates that injection mold specimens should be molded in two cavity molds with dimensions 2 for the 60 × 60 for plaque specimen, 12.7 × 127 mm for bar specimens, and 100mm × 3.2-mm disk specimen. While Compression Mold involves a single cavity positive mold having cavity dimensions 60 × 60mm for plaque, 12.7 × 127 mm for bar specimen, and 100 mm × 3.2-mm for disk specimen.Specimen ConditioningConditioning of molded specimens must be done in the Standard Laboratory Atmosphere at 23 ± 2°C and 50% ± 5 RH.

Results of ASTM D955The results drawn by ASTM D955 give an indication of the shrinkage that occurred during the molding process. The shrinkage values obtained through ASTM D955 are crucial for various industrial applications as manufacturers and engineers use these values to optimize mold designs, ensure dimensional accuracy in finished products, and select appropriate materials for specific applications.Tests Relevant to ASTM D955The test relevant to ASTM D955 includes ASTM D3641 (Standard Practice for Injection Molding Test Specimens of Thermoplastic Molding and Extrusion Materials) and ISO 294-4.

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Where can I get the astm d955 tested?

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Please contact us for a detailed quote for your astm d955 testing needs. Cost incurred to carry out different astm d955 testing methodology depends on the type of raw material; number of samples, coupons, or specimens; test conditions, turn around time etc. Costs of some ASTM testing methods start from $100 and the final value depends upon the factors listed above. Please contact us for the best and latest prices.

How many samples are required for astm d955?

The required number of samples or specimens should comply with the procedure given in the astm d955 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.

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The turnaround time for astm d955 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.

Where can I get the astm d955 tested?

You can share your astm d955 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm d955 test to various testing techniques.

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