COVID-19: Update from HCRC

Identify Seals

HCRC carries standard O-Rings, U-Seals, Quad Rings and Wipers. All standard and metric sizes available.

O-Rings O-Rings Click to enlarge

O-Rings
O-rings (OR) utilize a very basic design and are used in a wide variety of static and dynamic applications. Used as piston and rod seals, end seals, and belts.

Symmetrical U-Seal Symmetrical U-Seals Click to enlarge

Symmetrical U-Seal
These U-seals are symmetrical lip, non-loaded U-seals that can be used in rod seal and piston seal applications.

  • Max Pressure: 5000 psi
  • Materials available: Polyurethane, Buna, Fluoroelastomer, Silicone, EPR, and Teflon
Rod U-Seal Rod U-Seal Click to enlarge

Rod U-Seal
These U-seals are designed to be used as a dedicated rod seal. The twin lip design improves sealing, while the primary lip protects the system from contamination and ensures seal stability.

  • Max Pressure: 6000 psi
  • Materials available: Polyurethane
Piston U-Seal Piston U-Seal Click to enlarge

Piston U-Seal
These U-seals are designed to be used as a dedicated piston seal. Ideal high performance seal for one piece or split pistons.

  • Max Pressure: 6000 psi
  • Materials available: Polyurethane
U-Seals Loaded U-Seal Click to enlarge

Loaded U-seals
Loaded U-Seals are designed to be used in rod and piston seal applications. There are two lip styles available; standard and B-lip. The B-lip style uses a beveled lip to ensure constant sealing and is recommended only to for single acting piston and rod seal applications. Available in square and deep sizes.

  • Max Pressure: 5000 psi
  • Materials available: Polyurethane, Polymyte, Fluromyte, and Fluoroelastomer
Quad Rings Quad Rings Click to enlarge

Quad Rings
Quad rings (QR) are designed to be used in similar applications as O-rings. The quad (4) lobe design allows for improved sealing, and reduces tendency to roll. Max Pressure: 1500 psi.

D Wipers D Wipers Click to enlarge

D Wipers
D wipers are classified as a snap-in style wiper. The D wiper also come in a ribbed heel style. The ribbed heel prevents wiper inversion and increases wiper life.

Double Lip Oil Seals Oil Seal Click to enlarge

Double lip oil seals
Double lip oil seals provide light dirt exclusion, while the sealing lip provides the same sealing abilities as a single lip seal. Double lip oil seals are rubber coated and spring loaded.

  • Max Pressure: 15 psi
  • Materials available: Carbon steel case with Buna or Fluoroelastomer lip
Single Lip Oil Seals Oil Seal Click to enlarge

Single lip oil seals
Single lip oil seals are the most economical seal for general service sealing. The outer case is rubber coated with a spring loaded sealing lip. These seals are typically used in pump and electric motor applications.

  • Max Pressure: 15 psi
  • Materials available: Carbon steel case with Buna or Fluoroelastomer lip
Single Lip Oil Seals Oil Seal Click to enlarge

Female Adapters
88-F female (top) adapters provide support and determine the quality and wear pattern of the set. These adapters are used in conjunction with center rings and male adapters to make V-packing sets.

  • Max Pressure: n/a
  • Materials available: Fabric, Nylon, and Teflon
Single Lip Oil Seals Oil Seal Click to enlarge

Center (Vee) Ring
88-V, V-packing center rings can be used as rod or piston seals. Combined with 88-F/M adapters, the center rings make sets that can be used in varying pressure applications.

  • Max Pressure: Varies
  • Materials available: Fabric, Buna, Fluoroelastomer, Teflon, and Hytrel
Single Lip Oil Seals Oil Seal Click to enlarge

Male Adapters
88-M male (bottom) adapters provide the base for the set. These adapters are used in conjunction with center rings and female adapters to make V-packing sets.

  • Max Pressure: n/a
  • Materials available: Fabric, Nylon, and Teflon
Single Lip Oil Seals Oil Seal Click to enlarge

Vee Packing Sets
While all sets incorporate fabric reinforced rubber pressure rings, one or two urethane rings are included to improve low pressure sealing, when it is feasible.

  • Max Pressure: Varies
  • Materials available: Fabric
Seals Info

Originally hydraulic seals were made of leather and rope. These are still being used, but today mostly Buna-N and urethane are the material of choice. O rings and Quad rings can be made of Buna-N or Nitrile, Viton, EPDM, Silicone, and Teflon. Other materials are also available.

Polypaks, U-Cups

U Cups and Polypaks are used mostly inside the main cylinder as a rod or shaft seal. These are mostly urethane. A Polypak is a type of U cup with a O ring or a Quad ring stuffed in the center of it.

CHEVRON Seals, are the most durable seals for hydraulic applications but have been mostly replaced with URETHANE U-CUPS and POLYPAK.

Packing Gland

PACKING Gland, can be rope or reinforced neoprene. Primarily used for rod wipers. A Jack that uses rope or packing gland will have an adjustable gland nut that allows users to tighten every so often to adjust for wear.

Buna (aka NBR, Nitrile) is the standard in hydraulic and pneumatic sealing elastomers. Its oil resistant nature makes it the top choice of materials being used with petroleum based hydraulic fluids. Buna has a good abrasion resistance, high tensile strength and resistance to compression set.

  • Color: Black
  • Temperature Min: -40°F
  • Temperature Max: 250°F

Fluoroelastomer (aka Viton®, FKM, fluorocarbon elastomer) seals are widely used in applications dealing with extreme temperature and/or extreme chemicals. Its compatibility to nearly all chemicals (exception - Skydrol, certain esters and ethers) makes it a popular elastomer in chemical processing, paper and pulp mills, various other chemical applications. Note - Viton® is a registered trademark of DuPont Performance Elastomers.

  • Color: Black or Brown
  • Temperature Min: -15°F
  • Temperature Max: 400°F

Silicone compounds are generally not recommended for dynamic sealing applications due to poor tensile strength and abrasion resistance. Silicone does exhibit excellent resistance to extreme temperature and is an acceptable FDA material. Typical use for silicone is in dry heat applications and food processing applications.

  • Color: Red
  • Temperature Min: -65°F
  • Temperature Max: 450°F

ERP (aka EPDM, Ethylene Propylene) is used in applications that deal with acids, weak alkalis, and automotive break fluid. EPR is also an acceptable FDA material.

  • Color: Black
  • Temperature Min: -65°F
  • Temperature Max: 300°F

Neoprene is resistant to ammonia, freon, oxygen, ozone and many other fluids. An excellent material for use in pump and refrigeration applications.

  • Color: Black
  • Temperature Min: -65°F
  • Temperature Max: 300°F

Fabric is a composite material made by binding a cotton duck material with an elastomer such as Buna or Fluoroelastomer. The result is a stiff material with a high tensile strength. Fabric is used widely in hydraulic applications.

  • Color: Black
  • Temperature Min: Varies
  • Temperature Max: Varies

Teflon (aka PTFE, TFE) can be used in applications with extreme temperatures, extreme pressures and extreme chemicals. Since Teflon has a tendency to cold flow and has no memory, it is often filled with other materials (glass, bronze, and nickel) before it is used to make piston seals, rod seals and wipers. Note - Teflon is a registered trademark of duPont de Nemours and Company.

  • Color: White
  • Temperature Min: -200°F
  • Temperature Max: 500°F

Polyurethane (aka Hythane, Garthane) makes an excellent choice for hydraulic systems due to its good temperature range and high abrasion resistance. Urethanes are highly resistant to petroleum oils, hydrocarbon fuels, oxygen, ozone, and weathering.

  • Color: Clear, Black, Blue, Green, Red
  • Temperature Min: -50°F
  • Temperature Max: 200°F

Polymyte is an elastoplastic material with exceptionally high tear strength. Its high durometer makes it suitable for applications where extrusion is a problem. Polymyte can be used with petroleum based fluids, water based fluids, phosphate ester fluids, some chlorinated fluids and many solvents.

  • Color: Orange
  • Temperature Min: -500°F
  • Temperature Max: 2750°F

Fluromyte is a material that exhibits high tear strength and abrasion resistance and is preferred over Polymyte in high friction applications. Fluromyte has an excellent resistance to ozone, oxygen, petroleum and phosphate ester based fluids.

  • Color: Purple
  • Temperature Min: -65°F
  • Temperature Max: 300°F

Click here for information on how to measure seals.