What is ASTM 648?
What is ASTM 648?
ASTM D648 determines the temperature at which an arbitrary deformation occurs when specimens are subjected to an arbitrary set of testing conditions. ASTM D648 applies to molded and sheet materials available in thicknesses of 3 mm (0.125 in) or greater which are rigid or semirigid at normal temperature.
What is the purpose of heat deflection temperature?
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 deflection temperature under load?
It is also known as the ‘deflection temperature under load’ (DTUL) or ‘heat deflection temperature under load (HDTUL)’. Basically, it tests the stiffness of a material as the temperature increases. It is the temperature at which a polymer test bar will be bent at 0.25 mm under a given weight.
What is the heat deflection temperature of polypropylene?
What are the properties of Polypropylene?
| Property | Value |
|---|---|
| Melt Temperature | 130°C (266°F) |
| Typical Injection Mold Temperature | 32 – 66 °C (90 – 150 °F) *** |
| Heat Deflection Temperature (HDT) | 100 °C (212 °F) at 0.46 MPa (66 PSI) ** |
| Tensile Strength | 32 MPa (4700 PSI) *** |
What is Thermal Deflection Temperature?
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.
Is heat deflection temperature a thermal transition temperature?
Definitions. Glass Transition Temperature (Tg) — Temperature at which a material goes from a glassy state to a rubbery state. Heat Deflection Temperature — Temperature at which a material will deflect a specified amount at a specified load. Good indicator of short term/low load thermal capabilities.
What is the Vicat test?
One of the most common ways to assess cement consistency is with a Vicat apparatus. This machine is used to determine the standard consistency of a cement paste, as well as its initial and final setting time.
Is polypropylene safe for hot food?
It’s FDA-approved for food contact, so you’ll find polypropylene in food containers like those that hold yogurt, cream cheese, and butter products. Because it has a high heat tolerance, it’s also often used in packaging of food that can be heated in a microwave.
What is plastic deflection temperature?
The deflection temperature is the temperature at which a test bar, loaded to the specified bending stress, deflects by 0.010 inch (0.25 mm). The value obtained for a specific polymer grade will depend on the base resin and on the presence of reinforcing agents.
What is thermal transition temperature?
If we gradually increase the temperature of this crystal, then at 0 deg C, the ice turns to water. This is a phase transition. This is called a thermal phase transition. Polymers too can exist in different phases. The temperature of liquid nitrogen is anywhere between, -345 to -320 deg F (-210 to -195 deg C).
What is the purpose of a heat deflection tester?
It is designed to measure heat deflection temperature and VICAT softening temperature for evaluation of thermal property of plastic materials. Bench type HDT/VICAT tester. It is designed to measure heat deflection temperature and VICAT softening temperature for evaluation of thermal property of plastic materials.
What is the deflection temperature under load in Intertek?
Intertek provides Deflection Temperature Under Load (DTUL or HDT) ASTM D648, ISO 75 data for polymer datasheets and material specifications. Heat deflection temperature is defined as the temperature at which a standard test bar deflects a specified distance under a load. It is used to determine short-term heat resistance.
What is the heat deflection temperature of plastics?
Deflection Temperature Testing of Plastics. The deflection temperature is also known as the ‘deflection temperature under load’ (DTUL), ‘heat deflection temperature’, or ‘heat distortion temperature’ (HDT). The two common loads used are 0.46 MPa (66 psi) and 1.8 MPa (264 psi), although tests performed at higher loads such as 5.0 MPa (725 psi)…
What is heat deflection temperature under load ( DTUL )?
Intertek provides Deflection Temperature Under Load (DTUL or HDT) ASTM D648, ISO 75 data for polymer datasheets and material specifications. Heat deflection temperature is defined as the temperature at which a standard test bar deflects a specified distance under a load.
