PVDF Bolts / Kynar Bolts

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
• PVDF material datasheet

PVDF bolts / Kynar® bolts are made from a tough engineered fluoro-thermoplastic that offers a unique balance of excellent chemical resistance and good strength properties.

PVDF bolts / Kynar bolts 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 bolts / Kynar bolts also excel in high purity and low-permeability applications such as pharmaceutical and semi-conductor processing.

PVDF bolts / Kynar bolts are available in most metric and standard sizes. See our online store (top right) for common sizes or contact us for your specific requirements.

Bolt Types Available: Hex Bolts

PVDF Mechanical  & Physical Properties

PVDF Chemcial Resistance Compared to Other Polymers

PVDF Blind Flanges

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
• PVDF material datasheet

PVDF blind flanges / Kynar® blind flanges are made from a tough engineered fluoro-thermoplastic that offers a unique balance of excellent chemical resistance and good strength properties.

PVDF blind 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 blind flanges also excel in high purity and low-permeability applications such as pharmaceutical and semi-conductor processing.

Resources: Flange Dimensions, Flange Bolting Chart

Flange Types Available: Blind Flanges, Slip On Flanges, Socket Weld Flanges, Threaded Flanges

PVDF Mechanical  & Physical Properties

PVDF Chemcial Resistance Compared to Other Polymers

PVDF Slip On Flanges

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
• PVDF material datasheet
• Slip on flange features and benefits

PVDF slip on flanges / Kynar® slip on flanges are made from a tough engineered fluoro-thermoplastic that offers a unique balance of excellent chemical resistance and good strength properties.

PVDF slip on 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 slip on flanges also excel in high purity and low-permeability applications such as pharmaceutical and semi-conductor processing.

Resources: Flange Dimensions, Flange Bolting Chart

Flange Types Available: Blind Flanges, Slip On Flanges, Socket Weld Flanges, Threaded Flanges

PVDF Mechanical  & Physical Properties

PVDF Chemcial Resistance Compared to Other Polymers

PVDF Slip on Flange Features & Benefits

PVDF slip on flanges are similar to the socket weld flange but without the socket shoulder. When using a socket weld flange, the pipe rests against this internal shoulder. Since a slip on flange does not have shoulder, the pipe can slide completely through the flange hub and is free to spin. 

Advantages

• Typically lower in price than weld-neck flange, yet welding costs can be more.
• There is a reduced need to cut the pipe length accurately, making it easier to install.
• The slip on flange is free to spin on the pipe for easy bolt alignment.

Disadvantages

• They require two fillet welds: one fillet weld at the hub of the flange and a second weld at the inside diameter of the flange near the flange face.
• Though they can be used for high temperature and pressure applications, they typically are not as other flange types give a more secure joint.

PVDF Socket Weld Flanges

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
• PVDF material datasheet
• Socket weld flange features and benefits

PVDF socket weld flanges / Kynar® socket weld flanges are made from a tough engineered fluoro-thermoplastic that offers a unique balance of excellent chemical resistance and good strength properties.

PVDF socket weld 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 socket weld flanges also excel in high purity and low-permeability applications such as pharmaceutical and semi-conductor processing.

Resources: Flange Dimensions, Flange Bolting Chart

Flange Types Available: Blind Flanges, Slip On Flanges, Socket Weld Flanges, Threaded Flanges

PVDF Mechanical  & Physical Properties

PVDF Chemcial Resistance Compared to Other Polymers

Socket Weld Flange Features & Benefits

Similar to a slip on flange, an PVDF socket weld flange has an added shoulder inside the bore hole. The socket weld flange is designed so that a pipe can be inserted into the socket of the flange until it hits the shoulder of the socket. The pipe is then backed away from the shoulder approximately 1/16 inches before being welded to the flange hub. This internal weld provides this type of flange added strength. In addition, by grinding the internal weld smooth, turbulence and flow restriction are minimized. PVDF socket weld flanges are most commonly used on small diameter applications (1/2" through 4") and high pressure piping systems.

Socket Weld Flange Benefits

• Best for small size, high pressure applications
• Static strength equal to a slip on flange yet boasts a fatigue strength 1.5 times that of the slip on design
• Employs both a backside hub weld and an internal shoulder weld for increased strength
• Socket weld flanges delivers a lower risk of leakage than threaded flanges
• Socket weld pipes do not have to be beveled for weld preparation
• Butt-welded joints are easily fitted and no special machining

Socket Weld Flange Disadvantages

• The expansion gap and internal crevices left in socket welded systems can promote crevice corrosion.
• Socket weld flanges have two welds which makes them stronger yet more labor intensive to install. Due to the increased welding, it has become the practice to weld only at the hub of the flange, which is not recommended.

Installation Tips
The socket weld pipe fittings should allow for expansion gap of 1/16 inch (1.6 mm) between pipe and the shoulder of the socket.