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Biodiesel
Biodiesel is a new clean alternative fuel produced from renewable resources. Long-term testings have demonstrated that Kynar® Flex PVDF 2850-07 shows excellent resistance to Biodiesels blends. Kynar Flex® resins, immersed up to 3000hrs in Biodiesel blends at 40°C, have seen no loss of physical properties, minimal length change and minimal swelling (Table 1). The fluoropolymers nature of Kynar Flex 2850-07 repels diesel, biodiesel and their blends.
Table 1: Main physical properties changes of Kynar Flex PVDF in Diesel and Biodiesel fuels.
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Weight Gain
(+/-0.1%) |
Dimension Change
(+/-0.1%) |
Tensile Strength Change |
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Pure Diesel |
0.1% |
0.0% |
+7% |
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Blend (80% diesel + 20% biodiesel) |
0.0% |
0.0% |
+7% |
|
Pure Biodiesel |
0.0% |
0.0% |
+7% |
Typically plastic materials such as Polyethylene will swell in presence of gasoline and diesel. Long-term exposure results then in a loss of the mechanical resistance of these plastics. Because of its fluoropolymers nature, Kynar® PVDF does not absorb diesel and keep its strength and physical properties. In fact because Kynar® PVDF can crystallize with time, the experiment has demoinstrated that Kynar® PVDF was getting stronger under the conditions of the testing. The tensile strength increase by more than 7% in 8 weeks.
Graph 2: Kynar Flex® PVDF gain is minimal (<0.1%) in Diesel and Biodiesel fuels for a period of 16 weeks.
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