3.2 x 10-4 mbar x 1/s: Von der Heyde (VDH) ensures safe aluminium cast wheels.
3.2 x 10-4 mbar x 1/s – get it? For those of use without an engineering degree – this is the value, which a VDH leak detection machine for aluminium wheels understands. Generally speaking: When exceeding this limit value of a leak rate, the wheel is considered leaky and is not allowed to be mounted on a car. 3.2 x 10-4 mbar x 1/s is the equivalent to an air loss of 0.2 bar within 6 months at a tyre pressure of 2 bar. This leak rate is the tolerance threshold, which is measured with a helium leak detection method. This is the latest technology.