Kynar PVDF Piping for Acid Waste Systems

• Specification: PTFE, FPA,FEP,PCTFE,PEEK,PA,PP,PVC also available
• Trademark: Hongda
• Model NO.: pvdf
• HS Code: 4002709000

Product Description

                                                                 Kynar PVDF Piping
 

PVDF or polyvinylidene fluoride is a highly inert, semi-crystalline thermoplastic polymer. This material can be handled over a wide temperature range, from -20°C to + 130°C. It is very fire-resistant and remains unalterable even under a heat of 175°C. PVDF has outstanding chemical stability against most chemicals, including a wide range of aggressive chemicals such as halogens and oxidants, inorganic acids, aliphatics, aromatics and chlorinated solvents. However, the excellent chemical stability does not necessarily apply to strongly basic solutions or esters and ketones. In addition, it is very resistant to abrasion and remains stable under the action of UV and radiation.

PVDF is used in various fields such as the chemical industry for the manufacture of fittings, tanks and piping, but can also act as a protective barrier or insulator. This plastic is also used in the electronics sector for the insulation of wires and piezoelectric elements.



 

High Purity Water Systems

PVDF, like its fluoropolymer cousins, is also a product which can be manufactured in an extremely pure form, without the use of additives typically required of other polymers to provide mechanical strength and aid in processing. As a result, the material is good for high purity water systems where water of extreme purity is being conveyed (e.g. in 18 megaohm high purity water for semiconductor manufacturing, and in water for injection use in pharmaceutical manufacturing).

Compared to all other fluoropolymers, PVDF is the least expensive, and given its comparable chemical resistance and superb mechanical properties, is an excellent choice for rigid piping systems. Piping is manufactured in sizes from 1-1/2 inches through 12 inches and is available in molded fittings through 6-inch diameters.

PVDF is a heat fusible thermoplastic, and is typically joined by either socket fusion (ASTM D 2657, Practice 1) or butt fusion methods (ASTM D 2657, Practice 2). Unlike products such as PVC, CPVC or fiberglass, PVDF can not be solvent cemented or joined by adhesive bonding, mainly owing to the fact that its superb chemical resistance to most chemicals eliminates the possibility that common adhesives can soften or attack the surface of the tough polymer.

The SuperBlue product line also offers a mechanical means of joining, which for applications where installation is in areas that are restricted offers a reliable and easy method for joining the product. In addition, this mechanical joining offers the added feature that the PVDF product line can be transitioned to polypropylene via this form of joint (using a PVDF flexible joint liner), thereby offering the possibility of an economical installation. Therefore, polypropylene can be used outside of return air plenum rated areas, whereas PVDF can be used inside of all return air plenum rated areas. Since PVDF is more expensive than Fire-Retardant PP, such a combination makes for a very economical overall installation. This combination of materials is referred to by Orion Fittings as its "Triple-Play" combination, and is illustrated in the accompanying figure. Orion PVDF has been used extensively throughout the U.S. in schools, hospitals, and other research institutional buildings having a building occupancy, and thus, being subject to building fire codes.