OPUS

High Purity (DI, Lab): PVDF Pipe

High Purity piping systems exist in many applications from electronic manufacturing to food...
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Polyvinylidene Fluoride (PVDF) pipe, also known as Kynar®, is used in chemical and...
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Benefit of Material to Systems Application

Due to its extremely high purity, polyvinylidene fluoride (PVDF) has emerged as a popular choice for piping in high purity applications. PVDF piping systems are used to supply high purity de-ionized water, and high purity acids and chemicals, to processes for the production of semiconductors, solar energy equipment and for sterile environments such as biotechnology and life science laboratories.  Its chemical stability, its ability to be sterilized by heat and chemicals such as ozone, its resistance to fungi, and its low permeability to most gases and liquids make it useful for high purity installations.  

It is easier to install and less expensive than metals suitable for high purity systems.  Additionally, PVDF does not rust or rouge over time.  It maintains its purity over the entire length of the installation.

System Application and Material Usage

The de-ionization of water removes mineral ions from water to limit its ability to transfer electricity. De-ionized (DI) water is used in electrically sensitive applications such as the production of semiconductors, capacitors, and many chemical compounds.  PVDF pipe has the special ability to maintain the purity and DI quality of water. Other plastic piping materials can experience a shearing action from the water flowing against the inside of the pipe. This can lead to high concentration of particulates in the piping system. The ultra-smooth surface of PVDF pipe reduces this effect substantially, making it essential for many high-tech applications that require contamination-free piping. 

PVDF piping and tubing systems are available in a wide range of inner diameter sizes, wall thicknesses, and supported structures depending on the desired stiffness. Single wall and double wall configurations are available from 1 inch to 12 inch diameters.  PVDF is also available as flexible tubing with a flexural modulus, or measure of stiffness by ratio of stress to strain, that is one-sixth that of pipe-grade PVDF.

PVDF-lined steel piping systems are also available, combining the purity and chemical resistance of PVDF with the structural support of steel. These systems are very resistant to distortion from pressure and temperature.  

Joining methods for PVDF pipe include both welding methods (socket fusion, butt fusion, beadless fusion, and infrared joining) and mechanical methods (threading, sanitary joining, flanged, and the proprietary Riontite® mechanical joining system in which two faced-off components are forced together).  Flexible PVDF tubing can be joined with standard compression fittings. However, fittings and joining methods must be approved specifically for high purity applications. 

Depending on joining method, pipe diameter, and wall thickness, PVDF piping systems can be rated up to 975 psi at room temperature.  Typical pressure ratings for high purity PVDF infrared or butt-welded pipe are 150 to 230 psi.  Mechanical systems up to 2 inch diameters are typically rated to 150 psi.

Certain grades of pure PVDF pipe have been certified to meet ASTM E-84 and UL 723 standards for flame spread and smoke generation. The certification means that PVDF piping systems, when approved, can be used safely in areas such as air plenums that are protected in the International Mechanical Code.  

In addition to being non-combustible, PVDF pipe is able to maintain much of its strength and chemical resistance within a broad temperature range of -40°F to 285°F.

Manufacturers and Suppliers Participating in OPUS

Embassy Group LTD

Embassy Group LTD is a 100-percent member owned, 3.2 billion dollar corporation consisting of......
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F.W. Webb Company

F.W. Webb Company is a multi-faceted distributor of plumbing and heating, HVAC and controls,......
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Ferguson

Ferguson specializes in providing PVF, Plumbing, HVAC and Related Specialty Products and......
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J.O. Galloup Company

J.O. Galloup Company is a premier distributor of commercial and industrial piping products,......
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NIBCO INC.

NIBCO Inc. is a recognized industry leader of flow control solutions to the residential and......
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Watts Water Technologies

Watts Water Technologies  designs and manufactures valves and related fluid handling......
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Weldbend Corporation

Weldbend Corporation is a manufacturer of carbon steel welding fittings and forged steel......
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WinWholesale, Inc.

WinWholesale, Inc. is comprised of over 525 wholesale distribution locations. Along with Noland......
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Applicable Joining Methods

Heat Fusion Weld

Thermoplastic pipe which cannot be solvent cemented maybe joined using heat fusion.  Fusion...
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