1. For metal O.D. wall type:
0.4 to 1.6 μmRa,
1.6 to 6.3 μmRz
2. For rubber O.D. wall type:
1.6 to 3.2 μmRa,
6.3 to 12.5 μmRz
(Firmly affixes the oil seal and prevents leakage through the seal O.D.)- The process of replacing spark plugs is not as complicated as it may seem, and can typically be done at home with basic tools, provided you have the correct information and a little mechanical know-how. However, always refer to your owner's manual for specific instructions tailored to your vehicle model.
- The rubber used in oil seals is typically a synthetic blend, often a combination of nitrile butadiene rubber (NBR), fluoroelastomer (FKM), or silicone rubber, each with its own set of advantages. NBR, for instance, boasts excellent resistance to oils and fuels, making it ideal for automotive applications. FKM, on the other hand, is more resistant to high temperatures and chemicals, finding its use in aerospace and chemical processing industries. Silicone rubber, with its wide temperature range tolerance, is commonly employed in food and medical industries.
The block is unlikely to distort except after severe overheating, but check anyway using a steel ruler or similar high-quality straight-edge.
Most effective sealing is obtained with optimum shaft surface finishes. The sealing efficiency is affected by the direction of the finish tool marks and the spiral lead. Best sealing results are obtained with polished or ground shafts with concentric (no spiral lead) finish marks. If you must use shafts with spiral finish leads, they should lead toward the fluid when the shaft rotates.


ERIKS also supplies the types GR and GRST. These are virtually identical to the types R and RST, except in this case the metal inner ring is also completely encased in rubber. ERIKS uses FKM rubber here as standard, so these seals are ideal for use in acidic environments.
Overall, neoprene foam gaskets are a reliable and cost-effective solution for sealing and insulation applications in a wide range of industries. Their resilience, sealing properties, insulation capabilities, and versatility make them a preferred choice for manufacturers, engineers, and maintenance professionals who depend on high-quality gaskets to ensure the performance and longevity of their equipment.
(This prevents failure during mounting.)
All are fitted with a spring to preload the sealing lip. All these types are for non-pressurised or low-pressure applications up to 0.5 bar for diameters of a limited size. For diameter of 500 mm or more, the maximum pressure is 0.1 bar. For higher pressures, special types or PTFE lip seals can be used.
Notes
*1 ASTM: American Society for Testing and Materials
*2 For more details on fluid compatibility, please see the following:
Our suppliers try to provide the best quality oil seals and products are in some cases optimised to improve performance and fitment. Corteco is one of these brands, whose case studies we have listed for you.
Ensuring Proper Installation and Maintenance
Regular inspection and maintenance of right valve cover gaskets, intake valve cover gaskets, head gaskets, and valve cover gaskets are essential to identify signs of wear, damage, or leakage. Proper replacement of worn or damaged gaskets is crucial for maintaining the integrity and performance of the vehicle's systems. Adhering to recommended service intervals and using high-quality replacement components are essential for optimizing the performance and longevity of the vehicle's gaskets.