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Note: I am not in any way justifying the ASTM DTUL test.
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.
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