Round Rod in PVDF 1000 mm black

Round rod in PVDF gives you a turnable fluoroplastic that takes a broad chemical attack without losing shape or strength. The material holds long term temperatures up to 150 degrees continuously, has fire rating V0 according to UL 94 and a water absorption of only 0.04 percent. The density is around 1.78 g/cm³, which you feel in the hand: the rod feels heavier than it looks.

Chemically, PVDF belongs to the few engineering plastics that handle strongly oxidizing environments. Halogens, concentrated acids, chlorinated solvents and most organic chemicals do not bite. The exceptions are hot strong bases, polar aprotic solvents such as DMF and certain amines; there you should verify against a chemical resistance table before the component is tried in. The material is also approved for food contact according to FDA in the base grade.

For turning and milling, PVDF is rewarding. It chips finely, can be ground and polished to low surface roughness and holds the dimension better than softer fluoroplastics such as PTFE. Sharp HSS or coated carbide, moderate feed and plenty of cooling is enough; avoid letting the working temperature creep above 150 degrees during machining, because the material then starts to creep. Threading works without special tricks, and gluing requires primer or flame activation.

Practical applications are many in the chemical and process industry. Valve bodies, valve parts, conical seals, seat bearings and guide sleeves in pumps are classic choices. In the semiconductor and electronics industry the rod is used for turned fixtures, insulators and chuck parts where cleanliness and chemical stability are critical. Wear parts in mill and mixer environments, gasket rings against aggressive media, and equipment parts in wastewater treatment plants are other typical cases.

Compared with PTFE, PVDF is considerably stiffer and more dimensionally stable under load, but has a lower temperature ceiling and somewhat poorer chemical resistance to extreme oxidizing and reducing agents. Against POM you get poorer machinability and a higher price, but dramatically better chemical resistance and flame retardancy. Against PEEK, PVDF is cheaper and has V0 in the base grade, but does not reach PEEK's mechanical performance or temperature ceiling.

When choosing diameter, count on turning stock being available in a number of standard dimensions. If you need an exact final diameter, choose the nearest larger raw stock and turn it down. Lengths are cut to order. PVDF has relatively low heat conduction, so in continuous machining in series it can pay off to let the parts cool between operations to hold the dimensional tolerance.

The natural color is bone white to slightly transparent. Darker grades and black colored PVDF exist but belong to special order. The UV resistance is good outdoors, but with long exposure the surface can chalk slightly; pigmented grades hold the color longer.

Do you need help choosing the right diameter, or evaluating whether PVDF is enough against your medium? Send us a line with temperatures, concentrations and load and we will get back to you with a concrete proposal.

The same one meter round rod in black, for turned parts where the color matters.