**Styrene Butadiene Rubber (SBR) O-Rings**
**Basic Information**
- **Model No.:** SBR O Rings
- **Color of SBR O Rings:** Red, Black, White, Clear, etc.
- **Delivery Time:** Usually 7 days after sample confirmation or an order.
- **OEM/ODM:** Welcome
- **Certification:** ISO 9001:2008
- **Trademark:** Walle SBR O Ring
- **Transport Package:** Carton
- **Specification:** Customized according to your requirements
- **Origin:** Guangdong, China
- **HS Code:** 4016931000
**General Characteristics of SBR O-Rings**
SBR, also known as Buna-S or GRS (Government Rubber Styrene), was first developed in the 1930s–1950s as a synthetic alternative to natural rubber. It is made from butadiene and styrene, with approximately 23.5% styrene content. Around one-third of global SBR production is used in tire manufacturing. SBR is commonly used in seals for non-mineral oil-based brake fluid applications due to its good resistance to water, alcohol, glycol, and certain ketones.
**Temperature Properties**
- **Heat Resistance:** Up to about 225°F (107°C)
- **Cold Flexibility:** Down to approximately -70°F (-57°C)
**Chemical Compatibility**
**Compatible with:**
- Water
- Alcohol
- Glycol
- Certain ketones (e.g., acetone)
- Non-mineral oil-based brake fluids
- Silicone oil and grease
- Diluted water solutions
- Weak acids
**Not Compatible with:**
- Mineral oils
- Petroleum greases and fuels
- Aliphatic hydrocarbons (e.g., benzene, xylene)
- Chlorinated hydrocarbons (e.g., chloroform, trichloroethylene, carbon tetrachloride)
- Oxidizing agents such as nitric acid, chromic acid, hydrogen peroxide, chlorine, and bromine
**Chemical Resistance Table**
| Chemical | Very Good | Good | Fair | Poor |
|----------|-----------|------|------|------|
| SBR | | | | |
| Chemical Resistance | Good | | | |
| Acetone | | | | 4 |
| Air | | | 3 | |
| Alcohols| | 2 | | |
| Brake Fluids (Non-Petroleum Based) | | | 3 | |
| Diester Oils | | | | 4 |
| Glycols | 1 | | | |
| Ketones | | | 3 | |
| Mineral Oil | | | | 4 |
| Oxidation | | 2 | | |
| Petroleum Oils (Below 250°F) | | | | 4 |
| Silicone Fluids | 1 | | | |
| Steam (up to 500°F) | | | | 4 |
| Transmission Fluids (Type A) | | | | 4 |
**Product Images**
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**About Walle**
With many years of production experience and deep industry knowledge, Walle specializes in developing high-performance materials suitable for harsh sealing environments. We focus on improving customer value by offering high-quality products at competitive prices. Our advanced automated production lines and state-of-the-art testing equipment ensure the consistent quality of our SBR O-rings.
We pride ourselves on delivering the highest quality at the lowest cost, on time, for all SBR O-ring applications. If you have any questions or need further assistance, please feel free to contact us. It’s our pleasure to serve you!
Hoisting Mechanism And Spare Parts
The hoisting mechanism for a Tower Crane typically consists of a combination of a motor, a gearbox, wire ropes, and a hook block. Here is a breakdown of its components and how they work together:
1. Motor: The hoisting motor provides the power needed to lift and lower loads. It is usually an electric motor that generates high torque to handle heavy loads.
2. Gearbox: The motor's rotational motion is transmitted to the hoisting drum through a gearbox. The gearbox helps increase the torque and reduce the speed of the motor, enabling the crane to lift heavy loads at a controlled speed.
3. Hoisting Drum: The hoisting drum is a cylindrical drum around which the wire ropes are wound. It is directly connected to the gearbox and rotates as the motor operates. The drum's size and design determine the amount of Wire Rope it can hold.
4. Wire Ropes:
The wire ropes are wound around the hoisting drum and connected to the hook block. These ropes are made of high-strength steel and have a high load-bearing capacity. Multiple wire ropes are used to distribute the load evenly and ensure stability during lifting operations.
5. Hook Block: The hook block is attached to the lower end of the wire ropes and is responsible for carrying the load. It consists of a pulley system with one or more sheaves, which allows the wire ropes to change direction and support the load securely.
During operation, the motor drives the hoisting drum through the gearbox. As the drum rotates, the wire ropes are wound or unwound, depending on the direction of rotation. This movement raises or lowers the hook block, allowing the crane to lift or lower loads.
The hoisting mechanism is controlled by the crane operator using various controls and switches. Safety features such as limit switches and overload protection systems are also incorporated to prevent accidents and ensure safe lifting operations.
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SHEN YANG BAOQUAN , https://www.bq-cranes.com