The Norstone Polymer Impellers are the answer to the negative issues inherent in metal blades. The benefit derived from these blades are apparent in most applications but especially beneficial in abrasive slurries such as those containing Ti02, silica, calcium carbonate, iron oxide, limestone and diatomaceous earth.

The two most popular options for these blades are the polyurethane and polyethylene materials. However, this blade is also available in other materials of construction such as nylon and polypropylene.

Variety of blades: UHMW (black), natural urethane (amber) with keyway bore and stainless steel hub, polypropylene (white), dual hard pigmented urethane (yellow) with center bore and urethane hub with set screw. Click Photo for larger view.

Anti-Static UHMW Impeller

The polyurethane blade is a thermoset material cast in a special mold to meld two different durometers together giving the center of the blade a rigid construction and the grinding scoops of the blade a softer construction. This material is recommended only for non-solvent products. It is generally cast in bright yellow but can be made unpigmented resulting in natural amber.

The ultra high molecular weight (UHMW) polyethylene blade is a thermoplastic material fabricated in an anti-static grade. This material is recommended for solvent borne products. While it is not as abrasion resistant as the urethane, it is more chemical resistant. The color is always black due to the carbon impregnation for dissipation of static electricity.

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