Characteristics and performance

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.

The unique feature of the Hallite 820 is the Umbrella Wiper Technology™, which is a protective debris guard flap on the wiping lip that entirely covers the gland housing and prevents the water/slurry trap that is common with conventional wipers. This feature offers added protection to the integrity of the hydraulic system by reducing corrosion and preventing the ingress of contamination into the wiper housing groove and hydraulic cylinder gland which will result in increased system life.

The moulded ribs on the internal diameter provide extra stability to the wiper and help prevent the possibility of blow-out due to pressure trapping between the wiper and the main rod seal. Another advantage of the Hallite 820 is that it is easy to install without the use of special tooling, as is the case of the metal press-in wipers normally specified for harsh environments.

The Hallite 820 is also offered in a number of other high-performance polyurethanes, such as Hythane® 361 and the Hythane® 371, a very aggressive scraping material with proven track record in forestry, mining, and aggregate industries.

Product details

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Temp range

-45°C
110°C

Max speed

4m/sec
Key:
  • Recomended
  • Possible
  • Not suitable

* For fluid types marked as possible, please call our team of experts on +91 80 2372 6000 to talk through your requirements and determine if this seal is the most suitable for your needs.

 Dynamic applicationStatic application
Fluids based on mineral oil  
AnyRecommendedPossible
Waterbased fluids  
HFA (5/95)RecommendedPossible
HFB (60/40 invert emulsion)RecommendedPossible
HFC (water glycol)PossiblePossible
WaterRecommendedPossible
Other fluid types  
Air/NitrogenPossiblePossible
HFD (Phosphate ester ARYL Type)Not suitableNot suitable
Synthetic esters (HEES, HFDU)RecommendedPossible