FAQ | Product & Materials

Most Viewed FAQ's

How high a temperature do Phelps Gasket Sheets support?
What is a good Steam Gasket material?
What is the difference between EP, EPR, and EPDM?
Why is my O-ring leaking?
How do I find out the Pitch Circle Diameter (P.C.D.) of my gasket?
How to estimate the friction an O-ring will develop?
Does Phelps have materials and gaskets that meet USDA requirements?
How can I predict the compressive load generated by squeezing an O-ring?
Why is post-cured silicone important for rubber for high temperature gasket applications?
What is the difference between valve packing and pump packing?
What is Controlled Density in Spiral Wound Gaskets?
Can pump and valve packings be used interchangeably?
Why it is not recommended to apply pressure-sensitive adhesives onto solid EPDM rubber, low durometer (10 to 40 Shore A) Neoprene and Buna-N?
Does Phelps supply Aflas® or Parker O-Rings?
What is the difference between butt and skive cut rings?
  • How high a temperature do Phelps Gasket Sheets support?

    Phelps carries a wide range of products to support various Temperatures, Pressure, and Media. In general Phelps' carries sheets that can go 2400° Read more...


  • What is a good Steam Gasket material?
    Related: Compressed Gasket Sheet

      Phelps recommends three kinds of gasket materials for high temperature steam applications ranging upto 300F Phelps Green Sheets: Thoro Read more...


  • What is the difference between EP, EPR, and EPDM?
    Related: Elastomers

    EPR is an abbreviation for Ethylene-propylene copolymer, while EPDM is an abbreviation for Ethylene-Propylene Terpolymer. From a functional standp Read more...


  • Why is my O-ring leaking?
    Related: O-Rings, Cords, Molded Parts

    If you have the O-Ring seal with you, Does the seal appear damaged, deformed, swollen or physically changed in any way? If YES, then please refere Read more...


  • How do I find out the Pitch Circle Diameter (P.C.D.) of my gasket?

    The pitch circle diameter is the diameter that specifies the centre of bolt holes of your gasket. The P.C.D. is measured from the centre of the bore.


  • How to estimate the friction an O-ring will develop?
    Related: O-Rings, Cords, Molded Parts

    The best way to determine running friction is during trial-runs because application factors can change the running friction. Friction, either break-ou Read more...


  • Does Phelps have materials and gaskets that meet USDA requirements?
    Related: Food Grade Nitrile

    Yes, Phelps carries many materials with that are Food Grade and meet the FDA and USDA requirements Phelps Food Grade Nitrile Phelps Food Grade Pac Read more...


  • How can I predict the compressive load generated by squeezing an O-ring?
    Related: O-Rings, Cords, Molded Parts

    The force required to compress an O-ring primarily depends on the hardness of the O-ring, its cross section, and the amount of compression. Even if al Read more...


  • Why is post-cured silicone important for rubber for high temperature gasket applications?
    Related: Elastomers

    Some silicone rubber compounds utilize curing agents that require a secondary post-cure to finish the curing process. Although most silicones can pass Read more...


  • What is the difference between valve packing and pump packing?
    Related: Compression Packing

    In the case of pumps, the packing is generally designed to allow some leakage between the sleeve/shaft and packing to provide lubrication and heat rem Read more...


  • What is Controlled Density in Spiral Wound Gaskets?
    Related: Spiral Wound Gaskets

    Controlled Density is a term used in Spiral Wound gaskets to ensure optimum filler density across the windings to achieve consistent compression and e Read more...


  • Can pump and valve packings be used interchangeably?
    Related: Compression Packing

    In general, you some pump packing can be used in valves, but valve packing must not be used in pump application. Some packing is specifically designed Read more...


  • Why it is not recommended to apply pressure-sensitive adhesives onto solid EPDM rubber, low durometer (10 to 40 Shore A) Neoprene and Buna-N?
    Related: Elastomers

    EPDM compounds often contain certain chemical additives, such as paraffins, which migrate to the surface over time. When this happens, an adhesive bac Read more...


  • Does Phelps supply Aflas® or Parker O-Rings?
    Related: O-Rings, Cords, Molded Parts

    Phelps supplies makes it's own custom and standard O-Rings, in addition to supplying Parker O-Rings. Many customers ask for Aflas® O-Rings, which is a Read more...


  • What is the difference between butt and skive cut rings?

    A butt cut joint is typically a straight on a piece of packing when the ends are joined.These cuts or joints are primarily used in rotating applicatio Read more...


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