ASTM D648 - Standard Test Method for Deflection Temperature of Plastics Under Flexural Load in the Edgewise Position

ASTM D648 provides a standardized method to determine the heat deflection temperature (HDT) of plastics under flexural load. HDT is the temperature at which a standard test specimen deforms a specified amount under a given load, indicating the material's ability to withstand heat under load.

Scope:

  • Test Methodology: Describes procedures for subjecting plastic specimens to a three-point bending load and heating at a constant rate.
  • Load Specifications: Uses standard loads (0.455 MPa or 1.82 MPa) to measure the material’s resistance to deflection.
  • Result Measurement: Measures the temperature at which the material reaches a specified deflection (0.25 mm).
  • Material Compatibility: Suitable for thermoplastics and thermosetting materials.

Applications:

  • Material Selection: Determines the suitability of plastics for applications involving elevated temperatures.
  • Quality Control: Ensures consistency in material properties during manufacturing.
  • Product Development: Helps in optimizing the thermal performance of plastics.
  • Performance Testing: Evaluates a material's ability to retain structural integrity under heat and load.
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