What is significance of HDT?
The heat distortion temperature (HDT) – also known as the deflection temperature under load (DTUL) or heat deflection temperature – is an important property of polymers. It gives an indication at what temperature materials start to “soften” when exposed to a fixed load at elevated temperatures.
What is the unit of HDT?
HDT stands for Heat Deflection Temperature or Heat Distortion Temperature. The heat deflection temperature is a measure of polymer’s resistance to distortion under a given load at elevated temperature. In other words, it is the temperature at which a given polymer test bar will be bended of 0.25 mm under a given load.
What is HDT of polymer?
The heat deflection temperature or heat distortion temperature (HDT, HDTUL, or DTUL) is the temperature at which a polymer or plastic sample deforms under a specified load.
What is ASTM 648?
Intertek provides Deflection Temperature Under Load (DTUL or HDT) ASTM D648, ISO 75 data for polymer datasheets and material specifications. Scope: It distinguishes between materials that are able to sustain light loads at high temperatures and those that lose rigidity over a narrow temperature range.
What are the factors which affect the HDT?
However, the HDT test is a short-term test and other factors such as the time of exposure to elevated temperatures, the rate of temperature increase, and part geometry all affect the overall performance of the material under heat.
What is PP made of?
Polypropylene (PP) is a thermoplastic “addition polymer” made from the combination of propylene monomers. It is used in a variety of applications to include packaging for consumer products, plastic parts for various industries including the automotive industry, special devices like living hinges, and textiles.
What is HDT oil?
Process Description. Hydrotreating is a catalytic chemical process to remove Sulfur (S), Nitrogen (N), Oxygen (O), and metals from straight run and cracked products. This “clean-up” also saturates olefins to yield easier-to-process intermediates.
Which test method is used for HDT test?
Test procedure For the test to ISO 75, a specimen is placed in a 3-point flexure test kit and loaded with the test weight required to achieve the flexural stress specified in the standard.
What is HDT time zone?
Hawaii-Aleutian Daylight Time (HDT) is 9 hours behind Coordinated Universal Time (UTC). This time zone is a Daylight Saving Time time zone and is used in: North America.
What is HDT Skyrim?
The HDT Physics Extension for Skyrim (HDT) is a plugin for the Skyrim Script Extender (SKSE). HDT Physics Extension alleviates the problems associated with animation by actually using the physics engine that is part of the retail game.
Why is heat distorted?
Heat distortion is caused when light is refracted through air of differing densities. Hot air is less dense than cold air, so light waves are bent differently in hot versus cold air. The result is visible heat waves when there is a significant temperature difference between the ground and the air above it.
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