1+1 is more than 2

Metal parts such as shafts and hubs fixed inside the mould are fully surrounded by the highly liquid cast and form a non-positive connection during the curing process. Owing to the contraction caused by crystallisation and cooling, the plastic lining shrinks to the size of the knurled metal core according to DIN 82 1973-01. This axial and radial permanent hybrid connection allows the advantages of two materials to be combined in one workpiece:

1. Steel: transmission of high forces and torques, thermal dissipation, construction and fitting according to steel standards etc.

2. HAWAMID 12G: dry running possible, good antifriction properties, low weight, damping capacity, noise reduction, wear resistance etc.

The result will be a highly functional composite not attainable with other plastics.

Common hub materials are the steels 11SMn30, 36SMnPb14, C45, St52K, 1.4301 V2A, 1.4305 V2A, 1.4571 V4A, aluminium, brass (other materials available upon request).

Chemical corrosion protection

If finished parts are to be used in corrosive environments and stainless steel is not an option due to cost considerations, chemical corrosion protection is an option. In order to prevent corrosion, the finished parts are placed into an electrolytic bath. The metal surfaces are exposed to the electrolytic bath and coated with a 3-5 µ thin layer of zinc.

PA 12G is the only plastic with which both positive and non-positive connections between the plastic and hub are possible;
gear with hub made of chromium-molybdenum steel with conical seat
Cut-open binding shows knurl.
Highly stressed gear with polygon steel hub.

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