Hydraulic Seals
The main tasks of hydraulic seals are to retain hydraulic fluids, to exclude solid or liquid contaminations and to maintain the hydraulic pressure. These tasks require a variety of different seal designs and appropriate accessories. Key types of seals include:

• Piston Seals
• Rod Seals
• Wiper Seals
• Guide Rings

Polypak
Parker’s Standard PolyPak® (SPP) is a square cross-section squeeze seal with a symmetrical profile for use in either rod or piston applications. The standard Molythane shell provides high wear resistance and the O-ring energizer functions as a spring to maintain sealing contact under low pressure. The standard PolyPak utilizes a scraper lip design formed by a precision trimming process. The scraper edge wipes both fluid film and contamination away from the seal. A wide selection of sizes and alternate compounds allow this profile to match up with many hydraulic applications.

Quad Rings (Square Rings or X-rings)
Quad rings can be used in a wide variety of static and dynamic sealing applications. The four-lobed design provides twice the sealing surface in comparison to a standard O-ring. The double-seal action requires less squeeze to maintain an effective seal. This reduction in squeeze means less friction and improved seal life, and because parting lines are between the lobes, away from the sealing surface, problems of leakage associated with o-rings is virtually eliminated. Also, quad ring construction creates a more stable seal avoiding spiral twisting.

Radial Shaft Seals
Radial shaft seals are used between rotating and non-rotating machine components, and are made up of:

A) a cylindrical outer covering of sheet steel (shell) or elastomer which seals statically against the housing bore and enables the requisite interference fit of the seal in the housing bore to be obtained as well as facilitating proper installation.

B) an elastomer which provides dynamic and static sealing against the shaft. A sealing lip has an edge which is formed by pressing, cutting or grinding and is normally pressed against the counterface on the shaft with a defined radial force by a spring. The edge of the sealing lip and the shaft counterface form the most important functional area of a radial shaft seal.

O-rings (More about O-Rings)
The O-ring seals through its deformation between the surfaces against which it is supposed to seal. The working pressure at which the O-ring can be used is dependent on, among others, the installation mode, fitting clearance, the O-ring material, sealed medium and temperature. The O-ring is one of the most common sealing devices used in the many different applications.

• O-Ring Sizes
• Temperature Ranges
• Compatibilty Tables for Gases, Fluids, Solids (Parker Handbook)
• Generic Elastomeric Properties

V-Ring® Seals
V-Ring® seals are mounted on shafts and their thin, tapered lip seals against a surface (counterface) at right angles to the shaft. No special demands are placed on the surface finish of the shaft seat and the V-Rings® act as flingers, since they have an interference fit on the shaft and rotate with it. Misalignment of the shaft with respect to the counterface can be tolerated and V-Rings® also provide reliable sealing if the shaft is out-of-round or rotates.

V-Rings® are made entirely of elastomers without fabric reinforcement, and therefore particularly easy to install. They can be stretched and pushed over other components of the arrangement, e.g. flanges, etc.

EMI SHIELDING MATERIALS
AND GASKETING
Conductive Elastomers
Conductive Adhesives
Wire Mesh Gasketing
Engineered Laminates
CHO-Sorb^®-Ferrite Sleeves

OIL SEALS
Clipper^® Oil Seals
Klozure^® Oil Seals
V-Ring^®
CR Seals
CR Speedi-Sleeves

MOLDED RUBBER SEALS

"O" Rings
Urethane "O" Rings
Chromassure "O" Rings
Conductive "O" Rings
T-Seals
Thread Seals
Stat-O-Seals^TM
Parbak^TM Rings
Boiler Gaskets
Kalrez^® Parts
Quad-Rings^®

HYDRAULIC PACKINGS
Polypak^® Seals
Uneepac Seals
Piston Cups
U Cups
Wiper Rings
V-Ring^® Packings
Heavy-Duty Packings
Leather Packings

TEFLON^® SEALS AND PRODUCTS
Teflon^® "O" Rings
Encapsulated "O" Rings
Back-Up Rings
Glyd Ring^®
Cap Seals
Channel Seals
Variseal^®
Omniseal^®
Teflon^® Piston Rings
Teflon^® Envelope Gaskets
Teflon^® Tape
Gore-Tex^® Joint Sealant
Gore-Tex^® Valve Stem Packing
Gylon^® Gasketing
Envelon^®
Teflon^® Coated Fiberglass Tape

METAL GASKETS
Spiral Wound Gaskets
Boiler Manhole and Handhole
Gaskets
Ring Joint Gaskets
Flat Metal
Corrugated Metal
Jacketed Gaskets
Metal "O" Rings

LIQUID SEALANTS, EPOXIES AND ADHESIVES
Loctite Products
Silicone Rubber Sealants
Silaprene^® Adhesives
Conductive Adhesives
Devcon Products

LUBRICANTS
DynaPro Lube
Anti-Seize Products

MECHANICAL SEALS
Spring Actuated
Welded Bellows
Teflon^® Bellows
Cartridge Seals

SHEET GASKET MATERIAL
All Types Non-Asbestos Compressed Sheet
Compressed Asbestos
Nitrile
Neoprene
Silicone

Viton^®
Teflon^®
Hypalon^®
Cork
Ethylene Propylene
Vellumoid, Etc.
Durabla
EMI Shielding
Closed Cell Sponge
Beater Addition
Grafoil^®
Conductive Elastomers
Carbon Sheet

MECHANICAL PACKING
All Types of Braided Packing
Lantern Rings
Packing Hooks
Tom-Pac^® Packing
Die Formed Rings

EXTRUDED CORDS

Round and Square
Cross Sections of all Types of Elastomers, Urethane and Closed Cell Sponges.
Conductive Elastomers
Spliced and Vulcanized "O" Rings and Gaskets

FRICTION MATERIALS
Molded Roll Linings
Brake Blocks
Non-Asbestos Friction Materials

OTHER PRODUCTS
Siltemp^® Cloth
Ceramic Rope, Sheet, Paper
Norseal^® Foam Tapes
Expansion Joints
Fiberglass Ropes, Tapes, Cloth
Vibration Dampening Rubber
Boiler Gaskets
Teflon^® coated fiberglass tape and conveyor belting.
Vespel^®