Frequently Asked Questions

Q: How can I find the correct gasket material to use?

ANSWER
In order to specify a gasket, we need the Temp, Pressure and Media you are sealing.  Please visit the How do I size a gasket page of our website and fill in the blanks.  Please feel free to Fax or Email us the information and one of our Application Specialists will contact you.

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Q: What thickness of gasket should I use 1/8” or 1/16”?

ANSWER
As a rule of thumb, thinner is better.  The smaller the thickness, the less area the gasket is subjected to pressure.  This is true when using metal flanges that are in good condition.  For larger flanges and pitted flanges,  a thicker gasket is recommended to correct any minor defects or warping in the flange.  For plastic flanges, 1/8” Full Face is best with a soft gasket material. 

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Q: What kind of gasket should I use for Chemicals?

ANSWER
First, you need to know the specific chemical you are sealing.  Please use our chemical compatibility guide or Manufacturers links on our resources page.  Secondly, please find out the pressure and temperature for the gasket application.  Finally, what type of flange are you using?  (Ring, Full Face, Metal or Plastic?)  Please click on our “Which gasket should I use?” button.

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Q: What is the difference between an Elliptical and an Obround  Gasket. 
(They are often referred to as Manhole, Handhole gaskets).

ANSWER
An elliptical is egg shaped.  It does not have flat sides, it is always curving like an egg.
An Obround is shaped like a race track.  It has two flat sides and two 180 Degree turns.
For installation instructions please click here

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Q: What Garlock Values and Durlon Values do I use to install a gasket.

Garlock
Durlon

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Q: What are the dimensions of a 150# and 300# Ring and Full Face Gasket?

Please click here for instructions.

Q: Do you have a minimum order size?

ANSWER
Yes, $10.00 per order.

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Q: What is the difference between a SW,RW and RWI Spiral Wound Gasket? 
(Using Garlock Nomenclature for this example).

ANSWER
The SW is a winding only gasket (No Inner and Outer Ring) used for tongue and groove, male-female and groove to flat flanges.  Click Here For an Example

The RW has an outer solid (Centering) ring in addition to the winding.  It is suitable for raised faced flanges (RF).  The centering ring centers the gasket between the bolts. Click Here For an Example

The RWI has a solid Inner ring in addition to the RW gasket.  The inner ring acts as a compression limiter and gives extra support to the winding in high pressure applications and where a vacuum is present.  Please click on the links below to learn more. Click Here For an Example

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Q: What is the difference between an Oval and an Octagonal ring joint gasket?

ANSWER
This refers to the cross sectional shape of the gasket.   If you were to cut gasket in half and look at the ends, one has an oval shape and one has flats resembling an octagon.

Flanges with flat bottom V-grooves will accept either Oval or Octagonal gaskets. The Oval type is the only gasket that will fit a bottom radius groove.

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Q: Where do I use a Ring or Full Face gasket?

ANSWER
Ring gaskets are used on raised face flanges.  The gasket is self centering between the bolts. Full Faced (FF) gaskets are used on flat faced flanges where the bolts go through the gasket.

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Q: Which gaskets are FDA approved?

ANSWER
For low pressure/temperature applications, White Buna, EPDM and Neoprene.

For higher pressure/temperature applications, PTFE (Virgin, Durlon 9000, Garlock Gylon and Klinger Top Chem).

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