Products Description
Pneumatic cylinder cushioning seals are special sealing elements used inside cylinders. Their main function is to slow down the movement of the piston through a buffering effect when the cylinder piston approaches the end of its stroke, thereby achieving smooth and quiet operation and reducing mechanical shock and wear.

Key Features
1. Buffering performance
- Progressive damping design: Through adjustable or preset buffer structure, the piston deceleration is precisely controlled to adapt to different speeds (0.1~1.5 m/s) and loads (≤500 kg).
- Impact energy absorption: Reduce the end impact force by 70%, and reduce equipment vibration and structural wear.
2. High-performance materials
- Polyurethane (PU): Excellent wear resistance (wear rate <0.5 mm³/Nm), suitable for high-frequency applications (>1 million cycles).
- Nitrile rubber (NBR): Good oil resistance (by ISO 1817 standard), applicable temperature -40°C to +100°C.
- Optional fluoro rubber (FKM): Ideal choice for extreme temperatures (-20°C to +200°C) and chemically corrosive environments.
3. Precision engineering structure
- Double lip seal design: The main sealing lip provides dynamic sealing, and the auxiliary lip enhances dust protection to ensure zero leakage (leakage rate <0.1 cc/min).
- Compact geometry optimization: Adapt to ISO 6431/ISO 15552 standard cylinders, save 30% of installation space, and be compatible with mainstream brands such as SMC and Festo.
Structural Features
1. Seal Material: Usually made of high-performance elastic materials (such as NBR, PU, etc.), which have good wear resistance, oil resistance, and aging resistance.
2. Installation Method: Cushioning seals are generally fixed to the piston through slots or threads, which are easy and firm to install.
3. Integrated Design: Some cushioning seals are integrated with other sealing elements such as piston rings to form a compact component for easy installation and maintenance.
| Ø - Range | Pressure Range | Temp. range | Velocity |
| 6 - 60 mm | 1.6 MPa | -40°C +110°C | 1 m/s |
| 0.236 - 2.5 in | 232 psi | -40°F +230°F | 3 ft/s |
Application scenarios
Industrial Automation: In automated production lines, Pneumatic cylinder cushioning seals are widely used in robotic arms, conveyor belts, material handling equipment, etc. to ensure smooth and reliable operation of the equipment.
Robotics: Cushioning seals in robot joints and actuators can effectively reduce mechanical shock and improve robot service life and precision.
Automobile Manufacturing: Cylinder cushioning seals are used in various pneumatic equipment, such as stamping machines and welding robots, in automobile production lines to ensure efficient and stable production processes.
Food and Pharmaceutical Industries: In these industries with high requirements for hygiene and cleanliness, cushioning seals can prevent gas leakage in the cylinder and ensure a clean production environment.
about Us
Linde Polymer Tec Co., Ltd. mainly produces a variety of rubber compounds and rubber seals and currently has more than 3,000 material formulas and more than 2,000 product specifications. Products are suitable for automotive, aviation, machinery, petrochemical, medical, food, electronics, military, industrial, and other fields. Since the establishment of the factory, the company has completed the process consistency operation, and the product yield rate has reached 97.1%.

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