Softer tread material: Rubber and polyurethane
The softer tread materials indicated in Shore A are rubber and polyurethane (PUR), for example. Rubber wheels can be made of solid rubber, hard soft rubber or thermoplastic rubber (TENTEprene). There are also electric conductive versions. Rubber is almost universally applicable and particularly floor-friendly. It is also highly resistant to many substances.
PUR is gentle to floors, non-marking and vibration-damping, and is extremely abrasion-resistant and durable. In addition, it has low roll resistance . A distinction is made between wheels with a tread made of injection-molded or cast polyurethane. The cast version is generally of higher quality and slightly softer than injection-molded PUR. Injection-molded PUR, however, is harder and therefore offers slightly better mobility.
Harder tread material: Plastic and cast metal
Plastics such as polyamide (PA) are harder than rubber and polyurethane. Accordingly, the hardness is indicated in Shore D. PA is corrosion-resistant, break-proof and hygienic. It can be used at temperatures from -40°C to +80°C. Another option is polypropylene (PP), which has properties similar to those of polyamide.
Cast iron can be used if the wheel needs to be especially hard. It has a very high load-bearing capacity and is extremely wear-resistant. It can also be used at extreme temperatures from -100°C to +600°C. In the case of sensitive floors, however, the comparatively high surface pressure must be taken into account.
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