DTULDeflection Temperature Under Load
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Generally, the modulus and strength (both tensile and flexural) and DTUL decrease with an increase in plasticizer level, while the elongation and impact strength increase.
As a high-temperature material, the flexible PPS material has a melting point of 280[degrees]C and DTUL of 100[degrees]C, both of which are significantly higher compared to that of PA12 and PVDF.
The benchmark temperatures that we have been talking about--the Vicat softening temperature and the HDT (or DTUL)--at the two most commonly used stresses of 66 and 264 psi are shown on the modulus curve for the PC.
elongation (%) 110 130 115 Notched Izod (J/m) 850 840 850 DTUL
If the DTUL of a material, such as a 40% glass-filled nylon 66, is given as 250 C, then a simple calculation gives us 80% of the DTUL as 200 C.
Some programs use the deflection temperature under load (DTUL), also often referred to as the heat-deflection temperature (HDT) of the material.
The fourth test to be examined, entitled Deflection Temperature of Plastics Under Flexural Load (DTUL), pertains to a thermal property also known as the heat distortion temperature (HDT).
The fitness-for-use determination was based on the DTUL measured at 66 psi, which is 310 F (154C).
The client was confident that the material would be appropriate, based on the fact that the deflection temperature under load (DTUL) was greater than 325[degrees]C (617[degrees]F).
It has an improved use-temperature performance with a 116 |degrees^ C DTUL at 1820 kPa and a wide blow-molding processing range.
In previous columns in this series, we have demonstrated the capability of dynamic mechanical analysis (DMA) to determine the modulus of a polymer at virtually any temperature, and the advantage that this has over the traditional deflection temperature under load (DTUL) measurement.