More details on Impact Management

Snell Helmet impact test

M2010 and ECE 22-05 impact tests differ most in severity. Although the first M2010 impact at a site on the helmet is at a velocity of 7.75 m/sec, only slightly greater than 7.5 m/sec velocity in ECE 22-05, this difference is amplified by the choice of impact test equipment. The “guided fall” equipment specified in M2010 is estimated to be as much as 20% more severe for equal velocities than the free drop device specified by ECE 22-05. The hemispherical impact surface is also about 20% more severe than the kerbstone specified in ECE 22-05. And M2010 then demands a second impact at the same site looking for a substantial margin of impact management capability beyond what was exhausted in the first strike. Helmets without this margin or, for any reason unable to withstand multiple impacts cannot pass Snell testing and are unlikely to provide protection in multiple impacts or severe crashes. Although DOT requires two impacts at the same impact test site and does specify the hemispherical impact surface, it does not hit helmets that much harder than what is called out in the ECE 22-05 standard.