German Fibro seals, Fibro models, Fibro prices

Fibro seals are devices that prevent fluid leakage, consisting of at least one pair of faces perpendicular to the axis of rotation. These faces remain in contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of a compensation mechanism, in conjunction with auxiliary seals. Mechanical seals where the elastic loading mechanism and auxiliary seal are metal bellows are referred to as metal bellows seals. In light-duty seals, rubber bellows are sometimes used as auxiliary seals; however, since the elastic force of rubber bellows is limited, springs are generally required to supplement the loading force. Mechanical seals are commonly abbreviated as "mech seals".

Fibro Seal Classification

Oil seals are generally classified into single-piece and assembled types. Assembled types allow free combination of the cage and lip material, and are typically used for special oil seals. Based on sealing function, characteristics, structural type, operating condition, and sealing mechanism, oil seals can be divided into various forms with different names. However, by convention, rotating shaft lip seals are generally called oil seals, while seals used for static sealing and dynamic sealing (generally reciprocating motion) are called seals. The representative form of an oil seal is the TC oil seal, which is a double-lip oil seal with a garter spring, fully encapsulated in rubber. The term "oil seal" commonly refers to this type of tc caged oil seal.

Fibro Seal Materials

Common materials for oil seals include: Nitrile rubber, Fluoroelastomer, Silicone rubber, Acrylate rubber, Polyurethane, Polytetrafluoroethylene, etc. 1) Nitrile rubber (NBR): It offers good heat and wear resistance, and resistance to various lubricating oils, greases, and oil-gas mixtures. The applicable temperature range is -30 to 120 degrees Celsius. However, it cannot be used in phosphate ester hydraulic fluids or gear oils containing extreme pressure additives. It performs stably in gasoline and mineral oils with low aniline points. 2) Polyacrylate rubber (ACM): It has superior oil and heat resistance, wear resistance, ozone resistance, and UV radiation resistance. It is particularly resistant to lubricating oils, gear oils, motor oils, engine oils, and petroleum-based hydraulic fluids containing extreme pressure agents. It is suitable for operation in the range of -30 to 150 degrees Celsius. 3) Fluoroelastomer: It offers aging, heat, and oil resistance, and is suitable for almost all lubricating oils, fuel oils, and gasolines. It does not harden easily in oils containing extreme pressure additives. However, its cold resistance and high-temperature wear resistance are poor, and it exhibits significant permanent compression set. It is suitable for temperatures from -20 to 250 degrees Celsius. 4) Silicone rubber: It features outstanding high and low-temperature resistance. It can be used super-long-term at 150 degrees Celsius without performance change; it can be used continuously at 200 for 10000h. It maintains its unique elasticity, ozone resistance, and weather resistance within the working temperature range of -70 to 260. 5) Polytetrafluoroethylene (PTFE): It features outstanding chemical stability, thermal stability, friction reduction, and self-lubrication. Its decomposition temperature is above 400. Therefore, it can operate normally in the temperature range of -200 to 300 degrees Celsius. Except for free fluorine and alkali metals, it has excellent corrosion resistance to chemicals, solvents, hydroxides, and acids. Nitrile rubber and fluoroelastomer materials are widely used for oil seals. The former is low-cost, but the latter offers significant improvements in temperature resistance and sealing performance, though at a higher cost. It still retains some negative commonalities of ordinary rubber materials, such as poor wear resistance, short service life, and high sensitivity to shaft eccentricity, so leakage phenomena remain relatively common. PTFE oil seals are high-tech products and represent the future direction of oil seal development [2]. When selecting oil seal materials, compatibility with the working medium, adaptability to the working temperature range, and the lip's ability to follow the rotating shaft at high speeds must be considered. Generally, the lip temperature of an oil seal during operation is 20 to 50℃ higher than the working medium temperature, which should be noted when selecting materials. The operating range of an oil seal depends on the material used: for Nitrile rubber (NBR), it is -40 to 120℃; for Acrylate rubber (ACM), it is -30 to 180℃; for Fluoroelastomer (FPM), it is -25 to 300℃.

Fibro Seal Specifications and Applications

1) Standard single-lip type: Generally used for sealing mineral oil, water, and other media in high and low-speed rotating shafts and reciprocating motions. Standard oil seals are used in environments with little dust and impurities, resisting medium pressure<0.05MPa, with a maximum linear speed of 15m/s and reciprocating speed<0.1m/s. 2) Standard double-lip type: In addition to the usage characteristics of the aforementioned S type oil seals, it also provides dust protection. Standard oil seals with a dust lip can prevent dust ingress and resist medium pressure<0.05MPa, with linear speed ≤ 15m/s. 3) Springless type: Single-lip inner-cage rubber oil seal without a spring. Generally suitable for low-speed conditions where the sealing medium is lubricating grease. Linear speed ≤ 6m/s. 4) Outer-cage single-lip type: Single-lip outer-cage rubber oil seal with a spring. It has a thin waist, good followability, and good rigidity. Standard oil seals are used in environments with little dust and impurities, resisting medium pressure<0.05MPa. For cases where the rotational axis speed is ≤ 15m/s. 5) Outer-cage double-lip type: Double-lip outer-cage rubber oil seal with a secondary lip. It has a thin waist, good followability, high rigidity, and good concentricity. Standard oil seals with a dust lip can prevent dust ingress and resist medium pressure<0.05MPa. Rotational speed ≤ 15m/s. 6) Assembled single-lip type: Outer-cage oil seal formed by assembling inner and outer cages with rolled edges. It features high installation precision, fast heat dissipation, and heavy-load characteristics. Suitable for heavy-load conditions under high temperature and high speed. Medium pressure ≤ 0.05MPa, maximum linear speed ≤ 15m/s. 7) Unidirectional return flow type (right-hand/left-hand rotation): Angled ribs are manufactured on the air side of the lip. Utilizing fluid dynamics principles, it generates a unidirectional pumping action with a return flow effect. Related to the shaft's direction of rotation, the return flow effect results in lower radial force compared to standard oil seals, reducing wear and heat generation, and extending service life. Suitable for medium pressure<0.05MPa, rotational speed ≤ 20m/s. 8) Pressure-resistant type: Short lip and short, thick waist, providing pressure resistance. Working pressure ≤ 3MPa. Suitable for applications with medium pressure ≤ 3MPa, such as shaft end oil seals for high-pressure pumps. Generally, the PV value is ≤ 8. Rotational axis speed ≤ 15m/s.

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