Environmental influences
Chemical resistance
The information in the table is based on test results, recommendations from raw material suppliers and reports from our customers.
However, any legal liability is expressly excluded. If no special information is given in the tables, standard commercial purity, concentration and room temperature are assumed for the corresponding media. In case of doubt and especially in the case of untested and new applications, we recommend that you consult us so that special tests can be carried out if possible or consultation can be held with raw material suppliers.
Attention: Mixtures of different chemicals can have completely different effects than those indicated in the table. In case of doubt, we always recommend carrying out specific resistance tests on site beforehand!
Electrical conductivity ESD
Electrostatic discharges (ESD) are voltage breakdowns caused by large potential differences. These discharges (possibly visible as sparks) cause a short, high electric current and can lead to the ignition of flammable substances.
The electrical conductivity of wheels and castors serves to protect against electrostatic discharge, which can be caused either by transport equipment or the transported goods.
The electrical conductivity of a wheel or castor is considered to be given if its ohmic resistance does not exceed 104 Ω. A wheel or roller is considered antistatic if its ohmic resistance is in the range of 105 to 107 Ω.
The electrical conductivity of wheels and wheel coverings can be altered by deposits of obstructive substances and by chemical and mechanical influences in such a way that the permissible values specified in the standards are exceeded. In particular, dust, dirt, paint, acids, alkalis, overloading and impact loads can lead to the dissipation of electrical/electrostatic energy into the ground or road surface being reduced or completely interrupted.
Due to the large number of influences unknown to us when using our products, our warranty with regard to electrical conductivity can only refer to compliance with the specified permissible values of the wheels and castors in new condition on delivery.
The permanent monitoring of safety regulations, e.g. checking the values with regard to electrical resistance after installation and during use, is the sole responsibility of the user.
Corrosion resistance
The surfaces of wheel and castor components have different corrosion resistances depending on the coating.
Galvanized surfaces offer the advantage that the corrosion protection is retained despite minor damage caused by the galvanization. The galvanized parts are often subjected to an additional chemical treatment called passivation. A distinction is made between blue and yellow passivation, with yellow passivation offering even better corrosion protection than blue passivation. Zinc-nickel coatings have the additional advantage that they can be passivated and sealed, which leads to high temperature resistance and the prevention of white rust formation.
In electrostatic powder coating, the coating powder is sprayed onto the component and then baked on.
Stainless steels, in particular the material 1.4301 / AISI 304, exhibit very good corrosion behavior. Stainless ball bearings are generally made of the material 1.4034 / AISI 420.
Click below to find our stainless steel wheels and stainless steel castors.
Temperature resistance
The functionality of wheels or castors is also heavily dependent on the effect of temperature. All load-bearing capacities specified by us apply to a maximum speed of 4 km/h on smooth, level and clean floors at a temperature of approx. 20°C. However, the load-bearing capacity is significantly reduced at increasingly higher speeds and/or other ambient temperatures.
The relevant temperature for the running surface results from the interaction between the ambient temperature and the heat generated by walking. The extent of the flexing is influenced by factors such as the material, shape and load of the tread as well as the course, length and nature of the distance traveled.
Bearing friction increases slightly at low temperatures, and the load-bearing capacity and stability of plastics, for example, decrease when exposed to cold or heat. The load-bearing capacity and service life of running surfaces decrease significantly at higher temperatures. In addition, high static loads and high temperatures increase the risk of flattening. The stiffness and hardness of many elastomer wheel linings, especially rubber and many polyurethane elastomers, increase noticeably at low temperatures, which limits the elastic spring properties. However, special versions of polyurethane elastomers are available that retain their elastic and flexible properties even at temperatures as low as -30 °C or as high as +130 °C. Please ask us about this if required.
Click on the following button to find our heat-resistant wheels and castors.
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