Oil Seals

We are distributing TTO oil seals since 2000 and have wide range to cater your needs.

1. What is oil seal

Oil seals work to prevent leakage of sealed objects such as lubricants from inside and also to prevent the entry of dust and contaminants from outside. Oil seals are designed in a variety of shapes according to the applications and substances to be sealed.

First are theLipsthat are the most critical component of seals, its edge contacts around the shaft surface in order to provide excellent sealing performance, during service, seals are placed under various stresses, such as machine vibration, shaft run and changes in the temperature and pressure of substances to be sealed. The lipsare designed so as to generate force and to keep the sealing edge consistently in contact with the shaft under such stresses. For such stresses, seal rubber material is made fromsynthetic rubber, which is highly elastic and abrasion-resistant.

Second part of seals is spring which supplements the tension of the sealing edgeto ensure tight contact between the shaft and the sealingedge and enhanced sealing performance. The spring alsoprevents the deterioration of main lip sealing performancecaused by high heat or others. Because this spring is a closely wound type coil, theinitial tension can be obtained high level, and thenchanges in load characteristics can be gradual withrespect to spring elongation. Tension at the sealing edgecan thus be kept stable at an appropriate level.

2. Material

An oilseal normally consists of three basic components: Sealing Element, Metal Case, and spring. It is a widely used sealing component. The function of a seal is to prevent the leakage of medium along the moving parts. This is mainly achieved by the sealing element. The materials normally used are Nitrile, Acrylic, Silicone, and Fluorinated Rubber.

Nitrile Rubber (NBR)

NBR is most commonly used material. It has good heat resistance properties, good resistance to oils, salt solutions, hydraulic oils, and gasoline. Operation temperatures are recommended from 40° to 120°C. It also functions well under dry environment, but only for intermittent periods. The disadvantage is poor chemical resistance.

Polyacrylate Rubber (PA)

Acrylic rubber has better heat resistance than Nitrile. It is recommended for high surface speed environment. The operation temperatures are recommended from ‐20° to 150°C. It should not be used with water or in temperature below ‐20°C.

Silicone Rubber (SI)

Silicone compounds operate effectively in a broad temperature range of ‐50° to 180°C. It is unsurpassed in its resistance to heat and low temperatures. The high lubricant absorbency of silicone minimizes friction and wear. It is usually used for crank shaft seals. Silicone has poor hydrolysis resistance. It should not be used in oxidized or hypoid oils.

Fluorinated Rubber (VI)

Fluorinated rubber is widely known under the du Pont trade name of Viton R. It has the best resistance to chemicals and superior performance to high temperatures. Though VITON provides so many good prospects, it has the highest cost.


Performances of TTO oil seals

Items MaterialsNBRPA (ACM)SI (Vmq)VI (Fkm)
Temp. Range (°C)-40 to 120-20 to 150-50 to 180-30 to 200
Hardness (Shore)70 / 80 / 9070 / 8075 / 8570 / 80
Wear ResistanceO--XO
Costsmost economical 3rd costly 2nd costly highest
P.S. Temp. Range may be vary in different grade


Resistance to Chemicals TTO oil seals

Medium MaterialsNBRPA(ACM)SI(VMQ)VI(FKM)
Inorganic acids --------
Organic acids XXXX--
Alkali XOOO
Wear ResistanceO--XO
(O) Applicable
(X) Applicable in a limited of time<

Applicable but must be ovservedh5
(XX) Not Applicable

Hydraulic seals

Hydraulic seal is soft, nonmetal seal and it can be in found in variety of material determined by operating conditions, pressure and temperature. Hydraulic systems are sealed using a combination of specialized seals. The main function of seals is to retain hydraulic fluids and to exclude solid or liquid contaminations and to maintain rod and pistons alignment and pressure. Hydraulic Seals need to withstand high pressures, extreme temperatures and oblique forces within the cylinder, the function goes far beyond preventing fluid leakage

Available upto 280 MM ID