Power Plastics offers sprockets, wear shoes and wear strips made from tough Ultra High Molecular Weight Polyethylene (UHMW-PE) and oil filled Nylon materials that will survive the harshest water treatment environments. Our sprockets are manufactured from cast UHMW-PE sheet allowing the highest molecular mass structure providing the best wear rate in the industry.
UHMW-PE resists 85% sulfuric acid and concentrated sodium hydroxide. It has a specific gravity of .84 making it lighter than water and it does not absorb water. UHMW-PE’s low co-efficient of friction and weight give Power Plastic water treatment products abrasion resistance five times greater than metal. This allows for the reduction of power needed to drive a system by up to 15%.
The following information provides a brief overview of Power Plastic sprockets for H78 as well as 720 chains. For more information please feel free to call PPC.
Standard Design Features:
Split Hubs
Power Plastic sprockets are supplied with split hubs as STANDARD. The split hub design allows a sprocket to be assembled onto or removed from shafts without removing the shaft from the wall. It also allows the sprocket to be removed without removing adjacent items such as bearings, set collars, or static shaft bushings
Additionally, split sprockets can be reversed, allowing for use of the unworn sides of the sprocket teeth. This alone doubles the life of the sprocket
Power Plastic sprockets are also available in various types. Most Power Plastic sprockets, however, are supplied as type “C”. These hubs are symmetrically shaped with the hub extending an equal distance from the sprocket wheel on each side. Power Plastic sprockets are also available in “C” offset (sprocket wheel extends from hub slightly off-center), “B” type (hub only extends on one side), and “A” type (no hub at all – sprocket attached to alternate hub or device via holes on sprocket wheel).
Hunting Tooth
Power Plastic 720 sprockets are supplied in hunting tooth design as STANDARD. These hunting tooth sprockets have an odd number of teeth and are spaced at half of the chain pitch. With this arrangement, there are essentially two independent sets of sprocket teeth. Every time the sprocket makes a revolution, the chain links engage a new set of teeth. Each tooth makes contact with the chain only half as many times as it would on a regular sprocket, thus doubling the life of the sprocket.
With their standard split, hunting tooth design Power Plastic 720 sprockets will last four times as long as solid non-hunting tooth sprockets.
* Because of the smaller pitch size, NH78 sprockets are not available in hunting tooth style
