


No single physical property of rubbers is responsible for the successful performance of an oil seal or ‘O’ ring. The ultimate tensile strength, breaking elongation, modulus, shore hardness, creep and stress relaxation in tension and compression loads are all important physical properties that characterize a seal or ‘O’ ring. Compression strength and set together with stress relaxation or decay are important for effective sealing. The difference in these properties in a swollen seal is highly critical. An optimum swelling value in a fluid medium is a desirable feature. De-swelling decreases the seal pressure against the wall of the housing where the seal is fixed, leading to leakage. Over swelling minimizes the physical properties of the rubber. Seals made of polysulfide rubbers have extreme fuel resistance but undesirably high compression set. The effect of temperature on the seal is an important factor. Swelling under stress can increase at higher temperatures and a suitable compounding technique should be adopted to reduce this effect.
Table 2 a): Common types of oil seals (with spring)
Nitrile rubber (NBR)
Even the slightest chip or dent can cause contaminants to infiltrate your oil seal. If there are any scratches on the shaft, a leak path may develop, allowing the lubricant to drip. To protect the shaft from damage, wrap it in a mesh rubber screen and store it vertically in its compartment. This way, it can be shielded from potential cracking.
The perfect solution to this is to always use an oil seal that fits properly; the right size of the seal should be used. And in other cases, backup devices should be used to avoid the buildup of clearance gaps within the mating edges.


U-shaped silicone gaskets are versatile sealing components used in various industries for their resilience, flexibility, and resistance to extreme temperatures and environmental conditions. These gaskets are commonly employed in applications where a reliable seal is required, such as in automotive, aerospace, and industrial equipment. The U-shaped design allows for easy installation and effective sealing, making them suitable for a wide range of applications.
New Molds: 60 days, depending on ordering quantity.
Rubber gaskets are essential components in many industrial applications, providing a reliable seal between two mating surfaces to prevent leaks or contamination. One common type of rubber gasket is the 40mm rubber gasket, which is used in a variety of industries for different applications.
What Are Oil Seals?
Rotary shaft or oil seals are placed between moving and stationary pieces of machinery to ensure that contaminants, moisture, corrosive materials and abrasives do not damage the various components. They can also prevent unwanted mixing of fluids, including water and oil combining within a machine.