German Almatec seals Almatec models Almatec prices

Almatec seals are a common term for general seals, simply referring to lubricating oil seals. They are mechanical components used to seal grease (oil is the most common liquid in transmission systems, and also refers to general liquids), isolating lubricated parts from output parts in transmission components to prevent lubricating oil leakage. Seals used for static sealing and dynamic sealing (generally reciprocating motion) are called oil seals. The representative form of oil seals is the TC oil seal, which is a double-lip oil seal with a self-tightening spring fully covered by rubber. Generally, when people refer to oil seals, they often mean this type of tc skeleton oil seal.

Almatec seal classification

Oil seals are generally divided into single-piece and assembled types. Assembled types allow free combination of the skeleton and lip material, typically used for special oil seals. Based on sealing function, characteristics, structural type, working condition, and sealing mechanism, oil seals can be categorized into various forms and names. However, conventionally, rotary shaft lip seals are called oil seals, while seals for static and dynamic (generally reciprocating) applications are referred to as seals. The representative form of oil seals is the TC oil seal, which is a double-lip oil seal with a self-tightening spring fully covered by rubber. Generally, when people refer to oil seals, they often mean this type of tc skeleton oil seal.

Almatec seal materials

Common materials for oil seals include: Nitrile rubber, Fluorocarbon rubber, Silicone rubber, Acrylate rubber, Polyurethane, Polytetrafluoroethylene, etc. 1) Nitrile rubber (NBR): It has good heat and wear resistance, resistant to various lubricating oils, greases, and oil-gas mixtures. Applicable temperature range: -30~120 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 low-aniline-point mineral oils. 2) Polyacrylate rubber (ACM): Superior oil and heat resistance, wear-resistant, ozone-resistant, UV-resistant, especially resistant to lubricating oils, gear oils, motor oils, engine oils, and petroleum-based hydraulic fluids containing extreme pressure agents. Suitable for working temperatures between -30~150 degrees Celsius. 3) Fluorocarbon rubber: Resistant to aging, heat, and oil. Suitable for almost all lubricating oils, fuel oils, and gasoline. It does not harden easily in oils containing extreme pressure additives. However, it has poor cold resistance and high-temperature wear resistance, with significant permanent compression deformation. Suitable for temperatures between -20~250 degrees Celsius. 4) Silicone rubber: Outstanding high and low-temperature resistance. Can be used long-term at 150 degrees Celsius without performance change; can be used continuously at 200 for 10000h. Maintains its unique elasticity, ozone resistance, and weather resistance within the working temperature range of -70~260. 5) Polytetrafluoroethylene: Outstanding chemical stability, thermal stability, friction reduction, and self-lubrication. Its decomposition temperature is above 400. Therefore, it can work normally within the temperature range of -200~300 degrees Celsius. Except for free fluorine and alkali metals, it has excellent corrosion resistance to chemicals, solvents, hydroxides, and acids. Nitrile rubber and fluorocarbon rubber are widely used oil seal materials. The former is low-cost, but the latter offers significantly improved temperature resistance and sealing performance, though at a higher cost. It still retains some common disadvantages of ordinary rubber materials, such as poor wear resistance, short service life, and high sensitivity to shaft eccentricity, making leakage 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 20~50℃ higher than the working medium temperature, which should be noted when selecting materials. The working range of oil seals depends on the material: Nitrile rubber (NBR) is -40~120℃, Acrylic rubber (ACM) is -30~180℃, and Fluorocarbon rubber (FPM) is -25~300℃.

Almatec seal functions and applications

Engine: Crankshaft – front and rear crankshaft oil seals; Valve – valve oil seals (engine repair kit o O-rings) (distributor oil seal, water pump oil seal, balance shaft oil seal, oil pump oil seal...); Camshaft – camshaft oil seal; Transmission: Transmission – front and rear transmission oil seals; Shift lever oil seal (transmission repair kit o O-rings) (Transfer case – front and rear transfer case oil seals); Rear Axle: Half-shaft – rear half-shaft oil seal; Differential – (front/rear) pinion oil seal; Rear wheel oil seal; Front wheel oil seal; Steering gear oil seal (steering gear repair kit o O-rings); Power steering booster oil seal (front half-shaft oil seal). Any part within a rotating housing that contains liquid lubricating oil and connects to the exterior requires an oil seal. Some are made of rubber, some of metal, but most are steel-reinforced rubber, such as rear crankshaft oil seals, front and rear transmission oil seals, left and right half-shaft oil seals, front main reducer oil seals, and air compressor crankshaft oil seals.

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