The NBR 70 O-ring is a crucial component in various industrial applications, particularly in China’s rapidly growing manufacturing sector. Understanding its properties, applications, and advantages is essential for engineers and procurement professionals. This guide delves into the significance of NBR 70 O-rings, exploring their role in ensuring efficiency and reliability in machinery and equipment.
Readers can expect to learn about the material composition of NBR 70, its resistance to chemicals and temperature variations, and how these factors influence its performance. Additionally, the guide will cover best practices for selection, installation, and maintenance, ensuring optimal functionality in diverse environments.
By the end of this guide, readers will have a comprehensive understanding of NBR 70 O-rings, empowering them to make informed decisions in their projects. Whether you are a seasoned professional or new to the field, this resource will enhance your knowledge and application of this vital sealing solution.
The Comprehensive Guide to NBR 70 O-Rings in China
O-rings are ubiquitous sealing components, and the NBR 70 variety is particularly popular due to its balance of cost-effectiveness and performance. This guide delves into the world of NBR 70 O-rings manufactured in China, exploring their properties, applications, and variations. We’ll examine the technical specifications, compare different types, and address frequently asked questions. Several reputable Chinese manufacturers, such as Chaoyuerubber (www.chaoyuerubber.com), Jinshunsealing (www.jinshunsealing.com), and Xlong Seal (www.oring-seal.com), contribute significantly to the global supply of these essential seals. Techno Ad (www.technoad.com) also plays a key role in distribution and engineering support. O-ring-stocks.eu (www.o-ring-stocks.eu) offers a glimpse into the readily available stock sizes and pricing for these O-rings.
Understanding NBR 70 O-Rings
NBR 70 O-rings are made from nitrile butadiene rubber (NBR), also known as Buna-N. The “70” signifies its Shore A hardness, indicating its firmness and resistance to deformation under pressure. This hardness level provides a good balance between flexibility and strength. NBR 70 O-rings are renowned for their excellent resistance to oils, fuels, and various chemicals, making them suitable for a wide range of applications. Their cost-effectiveness further contributes to their widespread use in automotive, industrial, and other sectors.
Technical Features of NBR 70 O-Rings
The following table compares key technical features of NBR 70 O-rings from different manufacturers, demonstrating the consistency of quality across various suppliers. Slight variations may exist due to specific formulations and manufacturing processes.
| Feature | Chaoyuerubber | Jinshunsealing | O-ring-stocks.eu | Xlong Seal | Techno Ad |
|---|---|---|---|---|---|
| Shore A Hardness | 70 | 70 | 70 | 70 | 70 |
| Temperature Range (°C) | -30 to +120 | -40 to +150 | -30 to +120 | Varies | -40 to 100/-55 to 135 (special) |
| Oil Resistance | Excellent | Excellent | Excellent | Excellent | Excellent |
| Chemical Resistance | Good | Good | Good | Good | Varies depending on specific formulation |
| Tensile Strength (MPa) | Varies | Varies | Varies | Varies | Varies |
| Elongation (%) | Varies | Varies | Varies | Varies | Varies |
Different Types of NBR O-Rings
While the core material remains NBR 70, variations exist in size, shape, and additional features. The following table highlights these differences.
| Type | Description | Advantages | Disadvantages |
|---|---|---|---|
| Standard | Typical round cross-section O-ring, various sizes available. | Cost-effective, readily available, simple to install. | Limited to standard sizes and shapes. |
| AS568 Standard | Conforms to the AS568 standard for inch-based sizing. | Standardized dimensions, readily interchangeable. | Limited to inch sizes. |
| Metric Standard | Conforms to ISO 3601 and other metric standards for sizing. | Standardized dimensions, readily interchangeable. | Limited to metric sizes. |
| Custom-made | Manufactured to specific dimensions and tolerances. | Perfect fit for unique applications, improved sealing performance. | Higher cost, longer lead time. |
| PTFE-coated | With a PTFE (polytetrafluoroethylene) coating for enhanced performance. | Improved friction, better chemical resistance, extended lifespan. | Higher cost. |
Conclusion
NBR 70 O-rings are a versatile and reliable sealing solution widely used in various applications. Chinese manufacturers play a significant role in supplying these components globally, offering a range of options to meet diverse needs. Understanding the technical features and differences between various types enables informed selection for optimal performance and cost-effectiveness. Careful consideration of the operating environment and specific chemical compatibility is crucial for long-term seal integrity.
FAQs
1. What is the difference between NBR and other O-ring materials?
NBR excels in oil and fuel resistance, making it ideal for automotive and hydraulic applications. Other materials, like FKM (Viton), offer superior chemical resistance and high-temperature capabilities, while EPDM is better suited for applications involving water and ozone exposure. Silicone provides excellent low-temperature flexibility.
2. What are the typical applications for NBR 70 O-rings?
NBR 70 O-rings find applications in automotive systems (engines, fuel systems), hydraulic and pneumatic equipment, industrial machinery, and general-purpose sealing. Their cost-effectiveness makes them a popular choice for high-volume applications.
3. How do I choose the right size NBR 70 O-ring for my application?
The appropriate size is determined by the dimensions of the groove in which the O-ring will be seated. Consult sizing standards (AS568 or ISO 3601) or use the manufacturer’s specifications to select a proper fit.
4. What is the lifespan of an NBR 70 O-ring?
Lifespan depends on factors like operating temperature, pressure, chemical exposure, and dynamic movement. Under normal conditions, NBR 70 O-rings can provide reliable service for an extended period, but regular inspection and replacement are recommended to prevent leaks.
5. Can I use NBR 70 O-rings in all applications?
No. NBR 70 exhibits limitations regarding exposure to certain chemicals (e.g., ketones, esters, strong acids). It also has a limited temperature range and may degrade under prolonged UV exposure. For specific applications, alternative materials may be necessary.