Product Information

Cap Seals

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Cap seals offer a low friction seal for use in dynamic reciprocating applications.

A plastic cap provides a seal against the dynamic sealing face, an O-ring is used to energize the plastic cap and operates in a static environment. The O-ring uses the system pressure to increase the sealing force acting on the cap. The cap also prevents extrusion of the O-ring energizer when used in high pressure applications.

The plastic cap is typically made from a low friction material, such as PTFE. Under low pressure conditions, liquid media can provide lubrication as it migrates between the dynamic sealing faces through a capillary effect. Cap seals are often referred to as wet seals as they allow a small amount of fluid to pass across the seal.

Cap seals can be offered in two different designs, a heavy duty cap or a low profile cap:
Heavy duty cap
- Provides a thicker cross section of sealing cap for use with high pressure, up to 40 MPa
- Requires a non-standard groove for fitment
- Thicker section allows for greater wear, due to higher sealing forces induced
Low profile cap
- Generally for light to medium duty
- Can be retro fitted into standard O-ring grooves
- Provides good wear resistance and low friction, due to lower sealing forces induced

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About us

Precision Polymer Engineering Ltd specialise in the design, development and manufacture of high performing moulded rubber seals, rubber gaskets and elastomer components for worldwide industries. These include:

Aerospace & Defence
Chemical Processing
Food & Dairy
Marine & Power Engines
Oil & Gas
Pharmaceutical & Biomedical
Semiconductor/FPD/Solar

PPE have manufacturing & customer service facilities in the UK and USA as well as sales offices and dealers in Europe, USA & Asia so we can provide customers around the world with the same great service as those in the UK.

We have a team of seal design experts who will assist you in choosing the best materials and provide you with a sealing solution to suit your individual needs. Rubber seals & gaskets can be moulded to any size, for any sealing application and with a lead time as early as 48 hours.

Precision Polymer Engineering Material Brands:

Detectaseal^® - metal detectable and X-ray detectable elastomers detect and contain contamination.

EnDura^® - for sealing applications in aggressive high pressure environments.

Kimura^® - unique fully organic elastomers for semiconductor applications which require resistance to chemicals and high temperature.

Nanofluor^® - a range of hybrid organic and non-filled elastomers with low permeation, targeted plasma resistance for key processes and ultra-low out gassing.

Perlast® ICE – Perfluoroelastomers for very low temperature sealing applications.

Perlast® - Perfluoroelastomers for sealing applications where chemical resistance and high temperature performance are of extreme importance.

Our product range includes Elastomer O-rings, Custom Rubber Seals, X-Rings/Quad Rings, D-rings, T-seals, L-Seals, Spring Seals, Cap Seals, Wiper Seals – Scraper Seals, Lip Seals, Chevron Stacks, HyClamp Sanitary Gaskets, DIN11851 D-Seals. IDF Gaskets, RJT O-Ring Seals, Slit Valve Doors. KF – ISO – NW Flange Fittings, End-Effector Pads, Bellows, Diaphragms, Washers & Micro Seals.

Services

Component Design
Consultancy Service
Finite Element Analysis FEA
Cleanroom Manufacturing
Manufacturing Lead-Times
48 Hour Manufacturing Service
Testing & Analysis
Training Courses

Chat to one of our experts today for solutions to all of your sealing needs.

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Company details for Precision Polymer Engineering Ltd

Precision Polymer Engineering Ltd