AVAILABILITY:  A sampling of Parker’s part numbers are shown in the configurator above for select materials and sizes. If the material and dimensions required are not shown, assistance with part number configuration may be found in the literature documents in the Product Support tab. To check current tooling, review the Part Number Look-up document. Contact Parker for requirements outside typical ranges.

Parker's Type B PolyPak® (BPP Profile) is a squeeze seal with a symmetrical profile for use in either rod or piston applications in hydraulic systems. The rectangular shape of its cross section ensures stability in the gland.   

The standard Molythane shell (seal body) provides high wear resistance and the O-ring energizer element functions as a spring to maintain sealing contact under low pressure or vacuum applications.   The beveled lip design of the Type B PolyPak is excellent for cutting fluid film. The sharp beveled lip is formed by a precision knife trimming process.

A wide selection of sizes and alternate compounds allow this profile to match up with many hydraulic applications. The Type B PolyPak is an economical choice as a stand-alone seal or can be used in tandem with a buffer seal. In piston applications, this seal will function as a unidirectional seal. Dual Type B PolyPak seals should not be installed back-to-back in bi-directional pressure applications, as a pressure trap between the seals may occur. Instead, for bi-directional piston sealing, incorporate a PIP Ring®.

Standard Materials (Shell or Seal Body):
• P4615A90 Molythane®; Temp -65 / +200F; Pressure* 5000 psi; Surface speed