Kask is committed to creating products that guarantee safety and comfort, exceeding all requirements set by international standards and norms. Now Kask helmets are tested according to their new protocol, the KASK WG11.
According to the information provided by Kask, most tests on helmets that use rotational impact prevention technologies are carried out using headforms whose coefficient of friction is much higher than those of the human skull and therefore do not reflect reality.
The KASK WG11 test design uses impact conditions based on real accident data.
Rotational impact and BrIC
In seperate tests, Kask said they have also carried out BrIC analysis. BrIC is an algorithm that defines the level of a brain injury during impact. To simplify, to a lower number corresponds a lower risk of concussion. Concussive (AIS2+) values of BrIC for humans varied from 0.60 when scaled directly from animal data (Ommaya, 1985) to 0.68 when obtained directly from college football players (Development of rotational Brain Injury Criterion (BrIC), Human Injury Research Division, UNECE)
AIS is the Abbreviated injury scale: this incorporates current medical terminology providing an internationally accepted tool for ranking injury severity. AIS is an anatomically based, consensus derived, global severity scoring system that classifies an individual injury by body region according to its relative severity on a six point scale (1= minor and 6= maximal). AIS is the basis for the Injury Severity Score (ISS) calculation of the injured individual, according to the Association for the Advancement of Automotive Medicine (AAAM).
The limits Kask has defined for this test are also based on the following studies and norms:
- ECE 22.06
- Development of rotational Brain Injury Criterion (BrIC), Human Injury Research Division, UNECE
- Development of Brain Injury Criteria (BRIC), Stapp Car Crash Journal
- MIPS related results on motorcycle helmets, Peter Halldin, Division of Neuronic Engineering Royal Institute of Technology (KHT), Stockholm, Sweden
The final Kask protocol of KASK WG11 is:
- Oblique tests at 45°. Impact speed 6 m/s. BrIC < 0.68
- grade 80 closed-coat aluminum oxide abrasive paper
- wireless system: triaxial accelerometer + n. 3 ARS
- Headform: EN960 serie
Peak of rotational acceleration, Peak of linear acceleration of HIC, BRIC (< 0.68)
All Kask helmets successfully pass this test, with values that are never above a BrIC 0.390.
The above information was provided to Wiggle by Kask and can be found at https://www.kask.com/en/safety.htm.