PVDF - Kynar

PVDF is a relatively new fluoropolymer. Like the other fluoropolymers, its best feature is its chemical resistance. The mechanical features of PVDF are notably higher than PTFE and it does not suffer strain under load. 


FEATURES 

Chemical: it has the typical high chemical properties of the fluoropolymers. 
Mechanical: compared to PTFE it has higher mechanical features, such as tensile stress and compressive strength.  
Very good resistance to low and high temperatures up to 150° C. as well as UV. ray resistance.
Excellent dimensional stability.
Low flammability 
Low friction coefficient
Colour: natural


WEAK POINT
 
Compared to PTFE the resistance to high temperature is lower
(150 °C ).


APPLICATION

Mechanical: thanks to the stability of its excellent mechanical features, both in moist environments and at low temperatures, it is used especially in aeronautic, marine, and transport applications, and in machinery as bushings, bearings, slide and mechanical parts. 

Food contact: physiologically inert, it is approved for food contact by the most important international standards organisations. Thanks to this feature, it is widely used for components in food machinery, pumps for liquid food, etc.
 
Electrical: very good dielectric properties, halogen-free self-extinguishing power, weatherproof: these features make PVDF increasingly indispensable in this field. 

Chemical: the excellent chemical resistance to acids and alkali is typical of the fluoropolymers. It is used for components in the petrochemical and chemical industries. 

The graph shows that PVDF has better mechanical features than PTFE, but worse temperature resistance.
A: tensile stress
B: compressive strength
C: operating temperature
Blue : PTFE
Yellow : PVDF