O-RINGS-FOR-AUTOMOTIVEAutomotive applications stand out for their variety of conditions, under which the sealings must work. These differences basically depend on the high number of fluids present in the system. In fact, in a normal car we can find many types of fuels, both liquid and gaseous, coolants and lubricants, that work at different temperatures and speeds.

The main systems, which take advantage from the use of O-Rings are brakes, lubrication and air-conditioning. As regards the first one, it could be considered the most important of vehicle. The fluid, which flows in the circuit is synthetic oil with glycol as base, which assures regular and stable performances. System’s efficiency must be guaranteed in a temperature range, which goes from -40°C to +150°C. For this reason, compounds used to mould O-Rings for braking systems must not be subjected to deformations in presence of sudden variations of temperature and fluid pressure.

For what concerns lubrications systems, liquids that flow in the circuit are usually mineral oils, that contain variable quantities of additives, such as anti-foamings and antioxidants. Fluid temperature is different, according to the type of application and the circuit section, in which they are used. For the choice of compound, it is important to take into account the working temperature, because the higher is the temperature, the more the fluids are aggressive with the elastomer.

Finally, talking about the air-conditioning system, inside its circuit flow gaseous fluids, which are subjected to frequent state changes and the diverse circuit sections work at different temperatures. Compounds to be used must have a low gas-permeability and a good reaction to thermal shocks, in a range from -40°C up to 90°C.