Zatkoff Offers Incredible Inventory of Parker PolyPak Seals

April 28, 2021

Parker's Symmetrical PolyPak® Seal is a patented precision molded multi-purpose seal that combines an o-ring type synthetic rubber o-spring with a conventional lip-type seal to produce a unique sealing device capable of sealing in both vacuum and high and low pressure applications. At Zatkoff Seals & Packings, we offer an incredible inventory of PolyPak® Seals, with the largest stock of PolyPaks® in the United States. Offering nearly 200,000 in-stock standard P4615A90 Molythane parts, our inventory is hugely advantageous for our customers.

PolyPak® Advantages

The Parker PolyPak® offers a clear advantage over conventional lip seals, such as the standard u-cups, that are prone to leakage under low pressure, due to the fact that little or no lip loading is inherent in the basic seal design . PolyPak® is a squeeze type seal that provides high sealability at low pressure. As system pressure increases, additional force is applied to the PolyPak's® interface and as continued pressure increases, lip loading is automatically increased to compensate for the higher pressure, thus maintaining a positive, leak-free seal.

For additional information regarding the advantages of the PolyPak® seal, please visit the catalog for Rod & Piston SPP, DPP, and BPP PolyPak® Seals.

Types of PolyPak® Seals

PolyPak® Seals are offered in three styles or profiles that offer varying advantages. All three types of the PolyPak® Seals are squeeze type seals with a symmetrical profile for use in either rod or piston applications. A wide variety of sizes and alternate compounds allow these profiles to match up with many hydraulic applications.

Standard PolyPak® (SPP Profile)

Zatkoff offers over 700 sizes in stock

  • Standard Molythane shell provides high wear resistance while the o-ring energizer functions as a spring to maintain sealing contact under low pressure
  • Scraper edge wipes both fluid film and contamination away from the seal
  • Economical choice as a standalone rod or piston seal
  • Less squeeze force than the Deep or Type B profiles, allowing Standard PolyPaks® to be installed back-to-back, in separate glands, for bidirectional sealing
  • It is recommended that the o-ring be removed from the Standard PolyPak® facing the lower pressure side of the application to protect against pressure trapping

Deep PolyPak® (DPP Profile)

Zatkoff offers over 400 sizes in stock

  • Rectangular shape that ensures stability in the gland
  • Standard Molythane shell provides high wear resistance while the o-ring energizer functions as a spring to maintain sealing contact under low pressure or vacuum applications
  • Scraper lip design cuts fluid film and moves contamination away from the seal
  • Economical choice as a standalone rod or piston seal
  • Should not be installed back-to-back in bidirectional piston applications to avoid pressure trap
  • If a back-to-back configuration is used, it is recommended that the o-ring be removed from the Deep PolyPak® facing the lower pressure side of the application to protect against pressure trapping

Type B PolyPak® (BPP Profile)

Zatkoff offers nearly 600 sizes in stock

  • Rectangular shape that ensures stability in the gland
  • Standard Molythane shell provides high wear resistance while the o-ring energizer functions as a spring to maintain sealing contact under low pressure or vacuum applications
  • Beveled lip design is excellent for cutting fluid film
  • Economical choice as a standalone seal, or can be used in tandem with a buffer seal
  • In piston applications, this seal will function as a unidirectional seal. For bidirectional piston sealing, incorporate a PIP ring
  • Should not be installed back-to-back in bidirectional piston applications to avoid pressure trap

PolyPak® Sealing Solutions

With Zatkoff's large inventory of in-stock parts, our expert engineers are able to offer huge advantages for our customers. Contact us today to request more information about the Parker PolyPak® Seal applications and advantages.


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