污染物会对活塞杆、缸壁表面、密封件和其它结构件造成严重损伤，是导致流体动力系统的早期密封和组件失效的主要原因之一。
Hallite 提供一系列由高性能的 Hallite® 361聚氨酯，丁晴橡胶，Hythane® 181 和其它以聚酯为基料制造而成的防尘圈和骨架防尘圈。
防尘圈的重要功能相对而言，在液压系统中最容易被低估的密封类型。在选型时需特别注意并需要考虑到应用周围环境、工况条件等。
防尘圈
在密封配置的液压油缸中安装防尘圈是为了防止当活塞杆回缩时，诸如灰尘、湿气等污染物进入油缸内。
 33Temp range-30°C 100°C Max speed4m/sec The Hallite 33 wiper has a lip designed to remove lightly adhered dirt from the rod i.e. mud, dust or moisture. | 33 |
| Temp range | -30°C to 100°C |
| Max speed | 4m/sec |
 335Temp range-30°C 100°C Max speed5m/sec The Hallite 335 is an O-ring energised double lip wiper, which has been superseded as a product group. Equivalent parts can be found in the new E2W and E5W product datasheets from the Armorlene® PTFE product catalogue. | 335 |
| Temp range | -30°C to 100°C |
| Max speed | 5m/sec |
 37Temp range-30°C 100°C Max speed1m/sec The Hallite 37 single-lipped, metal-cased wiper is designed to press fit into open groove housings for light and medium-duty applications. | 37 |
| Temp range | -30°C to 100°C |
| Max speed | 1m/sec |
 38Temp range-40°C 120°C Max speed4m/sec The Hallite 38 single-lipped wiper/scraper is designed to fit metric housings including those of ISO 6195A. | 38 |
| Temp range | -40°C to 120°C |
| Max speed | 4m/sec |
 520Temp range-45°C 110°C Max speed4m/sec The proportions of the Hallite 520 wiping lip ensure that contact is maintained with the surface of the rod to remove heavily deposited containments such as mud and ice. | 520 |
| Temp range | -45°C to 110°C |
| Max speed | 4m/sec |
 521Temp range-40°C 110°C Max speed4m/sec The Hallite 521 snap-in rod wiper is designed for light-duty applications and to fit typical AN housings. | 521 |
| Temp range | -40°C to 110°C |
| Max speed | 4m/sec |
 820Temp range-45°C 110°C Max speed4m/sec The Hallite 820 single-lipped, snap-in rod wiper is designed to fit North American D-style housings and has been developed specifically for use in harsher environments with heavy contamination, such as in agriculture, off-highway, and forestry equipment. | 820 |
| Temp range | -45°C to 110°C |
| Max speed | 4m/sec |
 831Temp range-45°C 110°C Max speed4m/sec The Hallite 831 single lipped, snap-in rod wiper is designed to fit metric housings and is interchangeable with many common European wiper styles. | 831 |
| Temp range | -45°C to 110°C |
| Max speed | 4m/sec |
 834Temp range-45°C 110°C Max speed4m/sec The Hallite 834 single lipped, snap-in rod wiper is designed to fit standard housing, including many ISO 6195E sizes. | 834 |
| Temp range | -45°C to 110°C |
| Max speed | 4m/sec |
 839Temp range-45°C 110°C Max speed4m/sec The Hallite 839 double-lipped, snap-in wiper is designed to fit standard housings, including many ISO 6195C sizes, and to exclude dirt and moisture from entering the cylinder. | 839 |
| Temp range | -45°C to 110°C |
| Max speed | 4m/sec |
839NTemp range-45°C 110°C Max speed4m/sec The Hallite 839N double-lipped, snap-in wiper is designed to fit popular Asian housing sizes, and to exclude dirt and moisture from entering the cylinder. | 839N |
| Temp range | -45°C to 110°C |
| Max speed | 4m/sec |
 842Temp range-45°C 110°C Max speed4m/sec The Hallite 842 single-lipped, snap-in rod wiper is developed specifically for use in harsher environments with heavy contamination, such as in agriculture, off-highway, forestry, and long wall mining equipment. | 842 |
| Temp range | -45°C to 110°C |
| Max speed | 4m/sec |
 844Temp range-45°C 110°C Max speed4m/sec The design of the Hallite 844 double-lipped, snap-in rod wiper minimises the oil transfer out of the ram on the cylinder rod by collecting traces of fluid passing the rod seal. | 844 |
| Temp range | -45°C to 110°C |
| Max speed | 4m/sec |
 846Temp range-45°C 110°C Max speed4m/sec The Hallite 846 double-lipped, snap-in rod wiper is developed specifically for cylinders applications on mechanical handling equipment, particularly those with long stroke, and designed for use with venting U-rings, such as the Hallite 663 or Hallite 673 rod seal. | 846 |
| Temp range | -45°C to 110°C |
| Max speed | 4m/sec |
 847Temp range-40°C 100°C Max speed4m/sec The Hallite 847 wiper has been specifically developed for cylinders used in demanding, heavy-duty off-highway applications in dirty environments, such as earth-moving excavators. | 847 |
| Temp range | -40°C to 100°C |
| Max speed | 4m/sec |
 860Temp range-40°C 100°C Max speed1m/sec The Hallite 860 single-lipped, metal-cased wiper is designed to press fit into open groove housings for a wide range of applications. | 860 |
| Temp range | -40°C to 100°C |
| Max speed | 1m/sec |
 862Temp range-40°C 100°C Max speed1m/sec Hallite 862 single-lipped, metal-cased wiper is designed to press fit into open groove housings for a wide range of applications. | 862 |
| Temp range | -40°C to 100°C |
| Max speed | 1m/sec |
 864Temp range-45°C 110°C Max speed1m/sec The Hallite 864 is a double-lipped, metal-cased wiper is designed to press fit into open groove housings of popular Asian housing sizes for a wide range of applications and for use with venting U-rings, such as the Hallite 663 or Hallite 673 rod seal. | 864 |
| Temp range | -45°C to 110°C |
| Max speed | 1m/sec |
 E2WTemp range-45°C 200°C Max speed15m/sec The Hallite E2W is a double-acting, o-ring energized, rod wiper/excluder designed to include two different unique wiping lip geometries. The two lips combine to scrape debris from the rod and contain residual oil on rod extension, as well as allowing oil to pump back into the cylinder. | E2W |
| Temp range | -45°C to 200°C |
| Max speed | 15m/sec |
 E5WTemp range-45°C 200°C Max speed15m/sec The Hallite E5W is a double-acting, o-ring energized, rod wiper/excluder designed to include two different unique wiping lip geometries. The two lips combine to scrape debris from the rod and contain residual oil on rod extension, as well as allowing oil to pump back into the cylinder. | E5W |
| Temp range | -45°C to 200°C |
| Max speed | 15m/sec |
 ELATemp range-45°C 200°C Max speed4m/sec The Hallite ELA rod wiper/excluder uses a single aggressive wiping lip that provides ingression protection. The ELA wiper uses an o-ring energizer to keep the wiper centered, helping to compensate for potential side-to-side movement in the application. | ELA |
| Temp range | -45°C to 200°C |
| Max speed | 4m/sec |
 EXFTemp range-45°C 200°C Max speed15m/sec The Hallite EXF is a double-acting, twin o-ring energized, rod wiper designed to include two different unique wiping geometries. The two lips combine to scrape debris from the rod and contain residual oil on rod extension, as well as allowing oil to pump back into the cylinder. | EXF |
| Temp range | -45°C to 200°C |
| Max speed | 15m/sec |
