What Are the Differences Between the SA, M and K Standards?
The
SA standard was designed for competitive auto racing while M standard was for motorcycling. The K standard was released to
accommodate helmets used in karting. There are three major differences between them:
- The SA standard requires flammability test while the M and K standards do not.
- The SA and K standards allow for a narrower
visual field than M standard (Some SA and K certified helmets may not be street legal).
- The SA and K standards include a rollbar multi impact test while
M standard does not.
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SA2015 Helmet Approved for MVP Track Time |
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SA2020 Helmet Approved for MVP Track Time |
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There shall be three impacts at each site tested against the roll bar anvil. Sites selected for roll
bar anvil impacts must lie behind the fore plane and above the test line of the helmet. For the first impact the impact energy
shall be 150 J for all standard level testing and 140 J for all deviation level testing. For the second impact, the impact
energy shall be 120 J for all standard level testing and 115 J for all deviation level testing. For the third impact, the
impact energy shall be 100 J for all standard level testing and 95 J for all deviation level testing. Given an ideal frictionless
mechanical test facility, the standard impact energies represent 3.0+, 2.4+ and 2.0+ meter drops of a 5 kg headform and supporting
assembly.
Why should you replace your helmet every five years?
The 5-year replacement recommendation is based on a consensus by both the helmet
manufacturers and the Snell Foundation. Glues, resins and other materials used in helmet production over time can affect liner
materials. Hair oils, body fluids and cosmetics, as well as normal "wear and tear" all contribute to helmet degradation.
Petroleum based products present in cleaners, paints, fuels and other commonly encountered materials may also degrade materials
used in many helmets possibly degrading performance. Additionally, experience indicates there will be a noticeable improvement
in the protective characteristic of helmets over a 5-year period due to advances in materials, designs, production methods
and the standards. Thus, the recommendation for 5-year helmet replacement is a judgment call stemming from a prudent safety
philosophy.
NOT APPROVED FOR MVP TRACK TIME TRACK DAYS |
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NOT APPROVED FOR MVP TRACK TIME TRACK DAYS |