Alongside O-rings, oil seals are among the most economical and widely used sealing products — mounted on rotating shafts and moving parts in vehicles, hydraulic pumps, and motors to prevent fluid leakage. They keep lubricating oil from leaking out of friction points, prevent water and chemical leakage, and block external dust and dirt from entering.
POLY STAR maintains general (industrial) and hydraulic-motor oil seals as standard stock items, supplying the right shape and size quickly for a wide range of operating conditions and industries.
A rubber lip is vulcanized to a metal case, with a garter spring wrapped behind the lip to maintain constant clamping force against the shaft. The primary lip prevents oil leakage, and on types with a secondary (dust) lip, it additionally blocks external dust and moisture from entering.
| Type | Shape | Use | Max Pressure | Features |
|---|---|---|---|---|
| TC / SC |  | Oil & water | 0.3 kg/cm² | The most widely used type, with a spring built into the lip. TC is exposed with a dust lip; SC is enclosed without one. |
| TB / SB |  | Oil & water | 0.3 kg/cm² | Spring-loaded lip; packing grease between the lips allows operation even without lubricating oil. |
| KC / KB |  | Grease & dust seal | Not for pressurized use | No spring; fitted with a dust lip to block dirt and sand ingress. |
| VC / VB |  | Grease & dust seal | Not for pressurized use | Springless seal lip, sometimes assembled together with TC/TB types. Not suitable for excessive peripheral speed or eccentricity. |
| TA / SA |  | Oil, water, etc. | Some pressure rise possible | Spring-loaded lip with a reinforcing ring that reduces lip deformation. TA has a dust lip, SA does not. |
| DC / DB |  | Separates two fluids | 0.3 kg/cm² | Spring-loaded with two seal lips facing opposite directions to separate two different fluids. |
| TCV |  | Oil & water | 3 kg/cm² | Shorter, stiffer lip that prevents excessive contact pressure buildup; a high-pressure design with the spring positioned axially for stronger lip support. |
Prevents internal oil leakage and blocks external contaminant ingress.
Standardized geometry makes installation and servicing simple.
Stable sealing performance across a range of rotational conditions.
| Material | Application | Temp. Range |
|---|---|---|
| NBR | Standard material · excellent oil & wear resistance, suited to general industrial machinery and hydraulic lines | -30 ~ +100°C |
| FKM | Optional material · for high-temperature environments requiring heat & chemical resistance | -15 ~ +200°C |
