Classification:
Based on axle speed: low speed oil seal (less than 6m/s), high speed oil seal (more than 6m/s).
Based on pressure: atmospheric oil seal, pressure oil seal.
Based on construction and sealing principle: standard oil seal, power back oil seal.
Based on components: framework oil seal, case-less oil seal.
Based on spring: spring oil seal, no spring oil seal.
Construction: TC, TG, TB, TA, SA, SB, SC, VC, VB, TC4, TG4, etc.
 
Materials and advantages:
NBR oil seals: oil resistance and wear resistance.
FKM oil seals: oil resistance, hard-wearing, heat resisting, acid and alkali fast.
VMQ oil seals: heat resisting, anti-aging and non-toxic food grade.
 
Oil proof, hard-wearing, heat resisting, anti-aging, acid and alkali fast. 

Oil Seals are used to prevent oil leakage from rotary shaft and housing clearance. It has a flexible lip that rubs against a shaft or housing to prevent leakage or ingress of fluid and dirt. Seal selection is based on shaft diameter, housing bore diameter and width, shaft speed, working temperature, fluid, pressure differential and service conditions. Common configurations include single lip, double lip, triple lip and four or more lips.
 
Rubber sealing element or lip material choices for oil seals include: Nitrile Rubber (NBR), Acrylic Rubber (ACM), Silicon Rubber (VMQ), Fluorocarbon Rubber (Viton/FKM), Ethylene Propylene Rubber (EPDM), Tetrafluoroethylene Resin (PTFE). To resist wear, the compound durometer (hardness) is typically 70 to 85 shores A


A XIANG (XINGTAI)AUTO PARTS MANUFACTURING CO.,LTD