MaTestLab > Test Standards > ASTM D746 Brittleness Temperature of Plastics and Elastomers by Impact
ASTM D746 Brittleness Temperature of Plastics and Elastomers by Impact
ASTM D746 is a standard test method used to determine the temperature at which plastics and elastomers exhibit brittle behavior under impact. The test measures the effect of temperature on the physical and mechanical properties of the material.
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Introduction to ASTM D746
ASTM D746 is an important test method for evaluating the temperature sensitivity of plastics and elastomers. The test measures the temperature at which the material loses its ductility and becomes brittle under impact. This information is critical for determining the suitability of the material for specific applications and can be used for quality control, material specification, and research purposes.
ASTM D746 is a widely used test method for determining the brittleness temperature of plastics and elastomers by impact. The standard specifies the conditions for testing materials in a chilled condition, including specimen preparation, test conditions, and the methods for calculating the brittleness temperature. This test is important for determining the low-temperature performance of materials, particularly those used in applications where exposure to low temperatures is expected.
ASTM D746 Test Method
The ASTM D746 test method measures the brittleness temperature of plastics and elastomers by impact. The test is performed by chilling the specimen to a specific temperature, then striking the specimen with a pendulum impact tester. The temperature at which the specimen fails to withstand the impact is recorded as the brittleness temperature. The test is performed in two steps:
Specimen Preparation
The test specimen is prepared in accordance with the standard specification, including the dimensions and conditioning requirements. The specimen is then chilled to the desired test temperature, typically using a cryostat or other temperature-controlled chamber.
Impact Testing
The chilled specimen is then placed in the impact tester and struck with a pendulum. The energy required to break the specimen is measured, and the temperature at which the specimen fails to withstand the impact is recorded as the brittleness temperature.
ASTM D746 Specimens
Specimen Details
The specimens used in the ASTM D746 test method are typically rectangular bars with dimensions specified in the standard.
Specimen dimensions
The acceptable specimen dimensions for ASTM D746 are length: 63.5 mm (2.5 in), width: 12.7 mm (0.5 in), and thickness: 3.2 mm (0.125 in).
Specimen preparation
The specimens are prepared in accordance with the standard specification, including the dimensions and conditioning requirements. The specimen is then chilled to the desired test temperature, typically using a cryostat or other temperature-controlled chamber.
ASTM D746 Results
The results of the ASTM D746 test method are reported as the brittleness temperature of the material being tested. This temperature is important for determining the low-temperature performance of materials, particularly those used in applications where exposure to low temperatures is expected. The brittleness temperature is calculated using the energy required to break the specimen, as measured by the impact tester.
Tests related to ASTM D746 ASTM D746 is related to several other ASTM standards that measure the impact properties of materials, such as ASTM D256, ASTM D4812, and ASTM D5947. ASTM D256 measures the impact resistance of plastics, while ASTM D4812 measures the impact resistance of thermoplastic pipe materials. ASTM D5947 measures the physical dimensions of sold plastic specimens.
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The turnaround time for astm d746 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.
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