While use of PTFE as a gasket material increased in industrial applications, complaints about certain properties surfaced: skive marks made initial sealing difficult, cold flow caused leakage and premature failure, and temperature/pressure cycling was a problem.
Self-fusing silicone tape from Freudenberg Sealing Technologies is made of a specially formulated silicone rubber capable of fusing to itself to create a flexible, homogeneous barrier. The tape starts to tack within seconds, forms an air and water tight seal within minutes, and permanently fuses to itself within 24 hours.
Self-fusing silicone tape contains no adhesive, which makes for residue-free installation and removal. And unlike traditional adhesive based tapes, it can be applied to surfaces that are wet or dirty without any impact on performance. It has excellent dielectric strength, ozone resistance, high and low temperature stability and moisture resistance.
Their spliced products include hollow low-closure force seals, large diameter rings that cannot be molded, “picture-frame” gaskets and custom configurations for non-standard grooves. Rings are available in a wide range of sizes with capabilities for very tight tolerances.
Customers can choose from a large variety of profile cross-sections and different material technologies. Parker’s superior vulcanization technology offers high bond strength, uncompromised chemical resistance and consistent flexibility.
Transmission development is a focus for emissions reduction. Dual-clutch transmissions or automatic transmissions with eight or more gears not only increase the efficiency of the drivetrain but also create new challenges.
Higher load generation is one major challenge of dual-clutch transmissions and seals from Freudenberg Sealing Technologies made from PEEK (polyetheretherketone) or PAI (polyamideimide), in conjunction with their low-torque design, are a dependable solution to high load pressure. And Gallagher is proud to be your Freudenberg Sealing Technologies distributor.
A few weeks ago on this blog, we discussed a few of the common reasons for O-Ring failure.
Typically, O-Rings fail due to adverse effects of a number of factors, from improper installation and lubrication to incorrect size and design.
Today we’ll continue that discussion by looking at three more reasons why O-Rings fail, along with ways to identify and correct these failures.
Today’s aerospace, heavy duty and industrial markets are constantly pushing the boundaries of performance in their products. Parker Hannifin’s Composite Sealing Systems Division is working directly with manufacturers to provide industry leading tensile strength, pliability, and fire resistance.
Parker is able to achieve these requirements by expanding their product offerings with fabric coated or infused rubber. Reinforcing an elastomer with fabric increases the durability and longevity of a part along with added flame and abrasion resistance.
Much like Gallagher, Parker Hannifin continues to expand their product offerings to help customers meet the demands of a constantly evolving world.
Historically, technology to produce large diameter molded O-Rings has been limited by press and molding capabilities. One of Gallagher’s premier vendors, Parker Hannifin, has created a proprietary continuous molding technology which ensures the strength and reliability of large diameter FKM, HNBR, NBR and EPDM O-Ring seals. Parker’s solution eliminates the sealing performance problems sometimes found with common spliced rings and serpentine molding methods.
This radial shaft seal ring is based on know-how gained from years of experience. It continually undergoes further refinement based on the latest technological developments, and is particularly functionally reliable, flexible and extremely stressable.
The tried-and-tested original Simmerring keeps up with the times. Freudenberg’s experts have continued to develop it, with improvements in seal lip profiles. This has made it possible to further enhance its reliability and functionality across a broad range of applications. The advances include a friction-optimized design – the Low Friction Simmerring® – to decrease fuel consumption, which leads to reductions in CO2 emissions.
Gallagher Fluid Seals offers a comprehensive selection of Freudenberg Sealing Technologies products suited to a variety of requirements.
Gallagher and the Parker ISS Division design each drop-in-place seal with the application in mind, taking into consideration the material and manufacturing process of the mating surfaces to determine the most efficient design.
The drop-in-place design utilizes a rubber encapsulated plastic or metal backbone, lined with retention and stabilizer ribs. This design holds simple or complex seal shapes, easing installation and providing automation possibilities. Small contact points require less flange loading, providing maximum sealing under minimal pressure for non-ideal surfaces.
While O-Rings are an incredibly useful sealing application, they are not infallible. When they fail, it’s usually because of the combined adverse effects of several environmental factors.
The most common causes of O-Ring failures include:
- Improper gland design, allowing for too much or too little compression, not enough for seal expansion and tolerance stack-up.
- Incorrect O-Ring size.
- Incompatibility of O-Ring elastomer and environmental elements.
- Improper O-Ring installation.
- Inadequate O-Ring lubrication.
The combination of stresses on the O-Ring can be complex and difficult to evaluate. Therefore, it is crucial that both the O-Ring compound and size be tested in the real environment of its service. Below you’ll find three examples of the types of O-Ring failure that can occur, what causes the failure and how to identify and correct it. Continue reading Common Reasons for O-Ring Failure