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performance plastics seals are materials or components that prevent leakage of fluids or solid particles from between adjacent mating surfaces and prevent external contaminants such as dust and moisture from entering machinery. The recommended storage temperature for seals is below 30 °C to avoid high-temperature aging. Seals are classified into static seals and dynamic seals. Their main function is to prevent leakage of fluids or solid particles from between adjacent mating surfaces and to prevent external contaminants such as dust and moisture from entering machinery. Static sealing refers to tightly closing sealed chambers or containers; it also refers to stamps used for sealing letters and wills.

performance plastics seal operating principle

An oil film controlled by the lip of the oil seal exists between the oil seal and the shaft, and this oil film has fluid lubrication characteristics. Under the action of liquid surface tension, the stiffness of the oil film causes a meniscus to form at the interface with air, preventing leakage of the working medium and thereby achieving sealing of the rotating shaft. The sealing capability of an oil seal depends on the thickness of the oil film on the sealing surface. If the film is too thick, the oil seal will leak; if it is too thin, dry friction may occur, causing wear on the oil seal and shaft. If there is no oil film between the sealing lip and the shaft, overheating and wear are likely. Therefore, during installation, some oil must be applied to the sealing ring, and the skeleton oil seal must be kept perpendicular to the shaft axis. If not perpendicular, the sealing lip will wipe the lubricating oil off the shaft, leading to excessive wear of the sealing lip. During operation, slight seepage of lubricant from the housing is ideal to maintain an oil film on the sealing surface.

performance plastics seal applications

Skeleton oil seals are widely used in aviation, automotive, motorcycle, railway, vehicle, ship, home appliance, and construction machinery industries. They are suitable for sealing rotary and reciprocating motion. They are installed on heavy-duty engines, gearboxes, axles, ships, cylinders, and other components. Their main purpose is to prevent penetration of the sealed medium (gas, liquid) and entry of external foreign matter into the body. Precautions: Standard oil seals have a very limited pressure range, generally 0.03 MPa. This pressure is typically generated by the height difference of the lubricating oil itself. If higher pressure sealing is required, select high-pressure oil seals (generally capable of withstanding up to 1 MPa) or other sealing types.

performance plastics seal troubleshooting

1) Main factors causing oil seal leakage: Poor sealing of the oil seal is the primary factor causing leakage. When the shaft wears and forms grooves, even replacing it with a new oil seal may not achieve proper sealing. This is due to reduced contact pressure between the oil seal lip and the shaft, resulting in insufficient interference fit between the installed oil seal lip diameter and the shaft diameter. Taking the S195 diesel engine crankshaft oil seal as an example, the main reasons for poor sealing are analyzed as follows: (1) Poor manufacturing quality of the oil seal; (2) Poor quality of the shaft or bearing; (3) Improper use and maintenance; (4) Improper installation; (5) Improper storage, leading to adverse effects from environmental contamination. 2) Countermeasures for leakage due to poor oil seal sealing: Acquire basic knowledge to identify inferior products and purchase high-quality, standard-compliant oil seals. During installation, if the outer surface of the shaft has low roughness or defects such as rust spots, corrosion, or burrs, polish it smooth with fine sandpaper or an oil stone. Apply clean engine oil or lubricating grease to the oil seal lip or the corresponding position on the shaft diameter. Apply sealant to the outer ring of the oil seal. Wrap the keyway area on the shaft with hard paper to avoid scratching the oil seal lip. Use special tools to rotate and press the oil seal inward; never hammer or force it, to prevent deformation of the oil seal or spring breakage leading to failure. If lip flipping, spring detachment, or oil seal skewing occurs, it must be removed and reinstalled. Note: Do not arbitrarily tighten the inner spring when the shaft diameter is not worn and the oil seal spring tension is sufficient. Oil seals used in machinery generally operate under harsh conditions, with large environmental temperature differences, abundant dust, and frequent vibration causing constantly changing stress on components; therefore, frequent inspection, maintenance, and upkeep are required. If the shaft diameter and bearing are severely worn, or if the oil seal rubber ages or the spring fails, repair and replace the corresponding parts promptly. Troubleshoot abnormal heating in components or assemblies immediately. Avoid overspeeding or overloading the machinery to prevent increased temperature at the oil seal lip, rubber aging, and premature lip wear. Regularly check the engine oil level. If the engine oil contains excessive impurities, such as alloy powder or metal iron filings, completely replace it with new oil. The brand and quality of the replacement oil must meet seasonal requirements. It is recommended to add Metraile Super Sealant & Lubricant to the engine oil. It is an excellent gearbox additive that forms an inert material film on components, which can reduce oil seal leakage, extend the service life of oil seal gears, and reduce gearbox noise. The use of this Metraile super sealant lubricant will not contaminate or degrade the oil.

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