PPE manufactures and supplies fully moulded and CNC machined elastomer O-rings from 1.5mm (0.06") to 2.5 metres (8ft) outer diameter and 0.8mm (0.03") to 12mm (0.47") cross section. All of the rubber O-rings we manufacture are available in both small quantities and large volumes.
We hold a comprehensive range of standard O-ring moulds to BS1806, BS4518, AS568 and ISO3601. For non-standard O-ring seals we can produce bespoke tooling very quickly (92% of O-ring tools are produced same day) providing cost effective solutions and a responsive service.
With an unrivalled range of elastomer materials available, PPE has an elastomer for every application, with performance characteristics that meet high temperature, high pressure and aggressive chemical applications.
For O-rings used in food, dairy and pharmaceutical applications PPE offers a variety of elastomer material grades compliant with many international requirements such as FDA, USP Class VI, WRAS, KTW and 3-A in addition to metal detectable O-rings, all of which are free from Animal Derived Ingredients.
Pre-formed 'shaped' rubber O-rings are used to assist assembly and prevent unnecessary stresses being placed upon the seals. Such rubber O-rings are often used for rectangular path door seals or to navigate around pipe-work. By removing permanent stresses from the O-ring, PPE pre-formed O-rings can extend the life of the part in your application.
Jointed rubber O-rings - PPE offers the largest fully moulded, formed elastomer O-rings manufactured on a single tool, in one pressing operation. However, for O-rings larger than 2.5m (8ft) in diameter, lengths of cord can be joined to produce O-rings of limitless size.
T-seals offer an excellent sealing solution for static or reciprocating dynamic applications. T-seals can be designed to retro fit into existing O-ring grooves (both piston and rod orientations) or optimized for specific application requirements.
T-seals comprise of an elastomer T-shaped cross section and two backup rings made from an engineering grade plastic, often PTFE or PEEK.
The use of the backup rings allows the T-seal to be used in high pressure applications whilst still maintaining high sealing efficiency at low pressures. The design of the T-seal uses the system pressure to actively energise the backup rings, ensuring efficient extrusion resistance in single and bi-directional pressure applications, both in static and dynamic conditions.
Installation procedures for T-seals are often simplified over other seal designs due to their symmetrical geometry
L-seals offer a cost effective alternative to T-seals for static or reciprocating dynamic applications where high gland fill may be a concern with T-seals. L-seals can be designed to retro fit into existing O-ring grooves (both piston and rod orientations) or optimized for specific application requirements.
Similarly to T-seals, L-seals comprise of an elastomer L-shaped cross section using a single backup ring made from an engineering grade plastic, often PTFE or PEEK.
The use of the backup ring allows the L-seal to be used in high pressure applications whilst still maintaining high sealing efficiency at low pressures. The design of the L-seal uses the system pressure to actively energise the backup ring, ensuring efficient extrusion resistance in single direction pressure applications in static and dynamic conditions.
X-rings (also known as quad rings or four-lobed seals) offer an alternative seal solution to O-rings for use in reciprocating dynamic or rotary applications. They are often used in applications where the seal is required to operate under lower pressure and temperature conditions. Under low pressure, high sealing efficiency can still be achieved with an X-ring as the mould parting line is not coincident with the primary sealing faces.
X-rings can typically be retrofitted into existing O-ring grooves with the size often based around the original O-ring size. The square envelope of the X-ring stops the seal from twisting and rolling, preventing spiral failure often seen when O-rings are used in reciprocating applications. X-rings can be manufactured to standard O-ring sizes, as well as custom sizes for specific applications.
X-rings can also offer a reduction in friction as trapped media between the lobes can provide lubrication to the sliding sealing face. For low pressure applications, the combination of a low modulus material and small cross section can help to reduce friction. In high pressure applications, the friction can be reduced by selecting a higher modulus material with a reduced coefficient of friction.
D-rings offer another alternative seal solution to O-rings for use in reciprocating dynamic or rotary applications. They offer the same sealing characteristics as an O-ring and can be used in both low and high pressure application across a broad range of temperatures.
D-rings can typically be retrofitted into existing O-ring grooves with the size often based around the original O-ring size. The flat geometry on the base of the D-ring stops the seal from twisting and rolling, preventing spiral failure often seen when O-rings are used in reciprocating applications. D-rings can be manufactured to standard O-ring sizes, as well as custom sizes for specific applications.
For low pressure applications, the combination of a low modulus material and small cross section can help to reduce friction. In high pressure applications, the friction can be reduced by selecting a higher modulus material with a reduced coefficient of friction.
Wiper seals are typically used in conjunction with other sealing elements. A wiper seals primary function is to provide a physical barrier to limit the ingress of moisture, dirt and other contaminants into the primary sealing system, preventing damage to hardware and seals.
Wiper seals require a snap in fit into a rod groove locations and compliment a primary sealing solution.
Energised lip seals comprise of a high modulus elastomer, (or high grade engineering plastic) jacket and a low modulus elastomer O-ring energiser. The low modulus O-ring energises the jacket under low pressure conditions to increase the sealing force allowing them to be used in low and high pressure applications.
Energised lip seals provide a versatile sealing system for uni-directional pressure applications in either static or reciprocating dynamic conditions. Energised lip seals are symmetric in their cross section and so they can be used in both rod or piston grooves. Backup rings can be used in conjunction with energised lip seals to enhance extrusion resistance.
There are various profiles of energised lip seals available with differing qualities depending on application requirements.
PPE offers a range of profiles that maximize sealing integrity and life expectancy forbonded and non-bonded slit valve gates fitted with Perlast® seals.
Perlast® gates maximize wafer yields and PM cycles by utilizing ultra-pure translucent perfluoroelastomers that do notutilize inorganic filler systems such as metal oxides and silicas that can cause particulation in dynamic door applications.
Slit valve gates produced to your requirementsCustom molded formed O-rings, which follow the path of a rectangular groove, greatly extend seal-life by reducing stress levels experienced by toroidal O-rings in the corners.
PPE can help optimize groove design to accommodate seals with circular cross section orcan offer retro-fit solutions for existing hardware.
For new applications PPE Engineers can provide design advice on how best to actuate and control the door,in order to prevent leakage and maximize the effective life of the seal.
Large door seals for FPD and Solar panel manufacturing equipment are available as fully molded parts.
A major semiconductor manufacturer in Asia was experiencing problems with contamination and poor waferyield in a Low-K CVD process on a Producer® tool. The dynamic MONOVAT® gates were fitted with a traditional white FFKM material and the gates had to be replaced every 15,000-30,000 wafers
Since using MONOVAT® gates fitted with Perlast® G67P, this chip producer achieves over 90,000 wafers,which represents a considerable cost saving. This reflects the ultra-pure material composition, superior chemical resistance and outstanding mechanical properties of Perlast® materials.
MONOVAT® is a registered trade mark of VAT Vakuumventile AG.