In the current CE/UIAA regime every helmet is tested in the following way. Utilising an approved test rig at an approved test house, three types of weight are dropped from pre-determined heights at prescribed points onto a number of ‘conditioned’ helmets placed on a ‘head form’. The helmet is awarded a pass if the required results are obtained at each point. The centre test for the helmets is with a 5kg weight from 2m - this makes a big bang in the test room and is a certainly a hefty hit. So what are the tests, weights and results; 1. Impact test - A 5kg rounded weight is dropped from 2m twice, 10cm apart, in the centre of the helmet. Impact force measured must be less than 10kN CE or 8kN UIAA. 2. Impact test - A 5kg flat bottomed weight is dropped from 50cm at 4 points at the front, sides and rear of the helmet. Impact force measured must be less than 10kN CE or 8kN UIAA. (Note: the lower the figure recorded the better) 3. Penetration test - A 3kg pointed weight is dropped from 1m in the centre of the top of the helmet. No mark must be seen in a ‘putty’ which is placed in the ‘head form’. So, surprisingly for a sport whose realm is steep cliffs, sheer drops and exposure, one that requires a head for heights; the test drop heights for the head gear that we rely on in these circumstances can seem a little underwhelming. Even a layman might guess that when you’re 1000ft up El Cap, with 2000ft above, a falling object may come from further than the 50cm of the current Side, Front and Rear tests! However, these lab tests do have their purpose, they set a baseline to help compare products. Yet it needs to be recognised they also have their limitations, for example what if the baselines they help compare aren’t set at a high enough level? The picture they can give may be misleading. And to our eye the dichotomy in the differing drop test heights between very close points in the current test is the perfect example of this. Basically, how come the 5kN central impact test is from 2m yet can be as little as 10cm away from a place where it’s deemed a 50cm drop suffices? |