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Frequently Asked Questions

Why Use PTFE?
Are Different Resins Available?
How Do Your V-Ring Seals Work?
Are Custom Sizes Available?
Are Custom Configurations Available?
Are Custom Stack Heights Available?
Are Custom Shapes Available?
What Is The Pressure Rating?
How Much Pressure Is Required To Create A Seal?
Does PTFE have a shelf life?
Why cant certain shapes be molded in PTFE?

 


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1. Why Use PTFE?

PTFE resins have excellent physical properties for a wide range of sealing applications. They are essentially chemically inert and have a wide operating temperature. They are pliable, yet resilient. They have a very low coefficient of friction.

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2. Are Different Resins Available?

Yes. Although we deal primarily with unfilled PTFE, we do stock some of the commonly used compounds such as fiberglass, carbon/graphite, and moly filled. We use only prime-grade, virgin resins in our operations. We do not use mechanical-grade or re-processed resins at any time.

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3. How Do Your V-Ring Seals Work?

Here are photos illustrating a packing with and without compressive force applied. Note the flaring action of the sealing edges.

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4. Are Custom Sizes Available?

Yes, for a nominal set-up charge. We do have size limitations, so please contact us with your requirements.

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5. Are Custom Configurations Available?

Yes. All of our standard packing ring series can be custom configured. Here are some examples:



F/3V/M


F/8V/M


F/4V/M/Wiper


F/3V/M (filled resin F)

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6. Are Custom Stack Heights Available?

Yes. Our unique process allows us to vary heights/thickness within limits. Please contact us.



3 V-rings thin shoulder


3 V-rings thick shoulder

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7. Are Custom Shapes Available?

Not all shapes and geometries are compression moldable so be sure to contact us. Please see representative examples below.

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8. What Is The Pressure Rating?

Working pressures are highly application dependant: Is the seal static or dynamic? What is the surface finish on the mating parts? What is the operating temperature? The resin itself is non-porous so there will be very little leakage through the packing ring set itself.

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9. How Much Pressure Is Required To Create A Seal?

The same issues apply as for pressure rating (see above). Tighten the available adjustments until a seal is acquired. Keep in mind the resin will cold-flow somewhat on initial assembly so some subsequent adjustments may be required.

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10. Does PTFE have a shelf life?

PTFE is chemically inert, so it does not deteriorate with age or react with the environment. The working temperature range of the resin is so wide that storage at ordinary conditions over extended periods of time, will have no impact on its ultimate usage or application.

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11. Why cant certain shapes be molded in PTFE?

PTFE resin is compressed at room temperature in the solid state, not the liquid state as is done with injection molded thermo-plastics. The process is similar to that of powdered metal (PM) technology. Consequently during the filling the mold cavity stage, the resin does not readily flow around corners or into thin walls. When a cavity is not filled uniformly, there is non-uniform compression, which results in non-uniform shrinkage during the sintering stage, ultimately yielding dimensional issues.

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Plastic Injection Molding Services

3692 Milwaukee Avenue Chicago, Illinois 60641
Phone: (773) 282-3787 Fax: (773) 282-2333
E-mail: contact@parksideind.com
Plastic Injection Molding Services
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