Exceptional purity and chemical resistance with moderate strength
- High Purity and low extractables
- Chemically resistant to most common solvents including acids, salts, oils and steam
- Mechanical strength and toughness to 150°C (300°F)
- Resistance to ultraviolet, nuclear radiation, and standard sterilization methods
- Resistance to weathering and fungi
- Lap joint flange features and benefits
PVDF lap joint flanges / Kynar® lap joint flanges are made from a tough engineered fluoro-thermoplastic that offers a unique balance of excellent chemical resistance and good strength properties.
PVDF lap joint flanges have the characteristic stability of fluoropolymers when exposed to harsh chemical and ultraviolet environments but are much stronger mechanically than PTFE or PFA polymers. PVDF lap joint flanges also excel in high purity and low-permeability applications such as pharmaceutical and semi-conductor processing.
Lap joint flanges are unique in that they are made of two pieces, the flange itself and the stub end.
- The backside, has a slight shoulder that is square cut at the center or pipe hole
- The front side has a flat face with a filleted (rounded) center hole to match the filleted back face of the stub end. Here the stub end will wrap tightly around the center hole of the flange.
- Shaped like a short piece of pipe with a weld bevel on one. This portion of the stub end is also called the sleeve.
- Narrow shoulder on the flange facing end called is the hub. The back face of the hub has a rounded transition (or inside fillet) that joins the hub to the sleeve
Because a lap joint flange has a two piece configuration, it offers a way to cut cost when piping systems requires
- For high cost alloys the only "wetted" part is the stub end. In this situation, it is only required for the stub-end to be made of the higher cost corrosion-resistant material, where the flange itself can be the produced from lower cost steel.
- Ease of Work
By using lap joint flanges, work can be simplified in situations that require frequent and rapid disassemble and assembly during the operation of a plant. The ability to spin that backing flange compensates for misalignment of the bolt holes during assembly.