Heat deflection temperature (HDT) is the temperature at which the epoxy will deform under constant load. The same type of bar and test that is used for the flexural strength and modulus tests is used to find the heat deflection temperature.

Dec 18, 2024 · Heat Deflection Temperature (HDT) or Thermal Glass Transition Temperature (Tg) are the values you’ll want to compare for real-world usage, with HDT being the most conservative and most common. Simply put, HDT is the temperature at which cured epoxy begins to soften.

Heat deflection temperature or heat distortion temperature (DTUL, HDT, or HDTUL) is the temperature at which a polymer or plastic sample deforms under a specified load. [1] The HDT of a given plastic material is applied in many aspects to the design, engineering, and manufacturing of products which use thermoplastic components.

Tests to determine epoxy's Heat Deflection Temperature (HDT) or Heat Deflection Under Load (HDUL) help us to make good engineering choices.

May 29, 2024 · Discover everything you need to know about the heat deflection temperature (HDT) in plastics, polymers, and 3D printing materials. Understand ASTM standards and application.

Jun 8, 2021 · The Heat Deflection Temperature (HDT), or Heat Distortion Temperature, is a measure of a polymer’s resistance to alteration under a given load at an elevated temperature. It is also known as the ‘deflection temperature under load’ (DTUL) or ‘heat deflection temperature under load (HDTUL)’.

May 19, 2018 · When the temperature increases to 60 degrees Celsius, epoxy reaches the Heat Distortion Temperature (HDT), and it begins to deform. The HDT of an epoxy correlates to its glass transition temperature. The continued increase in temperatures to 90 degrees C leads to more ductile behavior.

For many applications the Heat Deflation Temperature (HDT) (ASTM D 648-21, 1978) is utilized in place of T g. This method employs castings with an applied load of 1.8 MPa (264 psi). The T g of epoxy adhesives, sealants and potting compounds varies from as low as 50°C to above 250°C.

This is the heat deflection temperature (HDT) of the material, measured in degrees Fahrenheit. If bonded parts are stressed when they are at or near their HDT, some dimensional changes or failure may occur.

Additionally, measuring the Heat Deflection Temperature (HDT) can indicate an epoxy’s glass transition temperature (Tg). Epoxies demonstrate a wide range of Tg, from as low as 50°C to upwards of 250°C.