Shanghai Sunland Industrial Co., Ltd is the top manufacturer of Personal Protect Equipment in China, with 20 years’experience. We are the Chinese government appointed manufacturer for government power,personal protection equipment , medical instruments,construction industry, etc. All the products get the CE, ANSI and related Industry Certificates. All our safety helmets use the top-quality raw material without any recycling material.
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Class G - General ,Helmet,: Headwear is non-conducting and is required to pass the dielectric strength ,test, of 2,200 volts for 1 minute; Class E - Electrical ,Helmet,: Headwear is non-conducting and is required to pass the dielectric strength ,test, of 20,000 volts for 3 minutes; Class C - Conductive ,Helmet,: Headwear ,does, not provide dielectric ...
11/7/2011, · During ,the Helmet, Retention ,Test,, all straps must hold ,the helmet, on the head without stretching beyond a certain amount. Then, all ,helmets, are retested again for concussion and retention after being frozen to minus 20 degrees, heated to over 120 degrees and submerged in water overnight.
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 the 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 the M standard ,does, not.
Helmet, Crash – The Melon ,Test, is an excellent example of a science fair project. It demonstrates what happens to a melon when it is dropped from a specific height without a ,helmet, (the control ) and then shows the effect of different types of ,helmets, (the variable ) on a …
Even if a company sells ,helmets, that are not ASTM certified and assures you their product ,does, meet ASTM certification standards, you have to question why they didn’t go through the official ,test,. Though there are other certifiers like Snell and Kitmark; ASTM is the only one that approves ,helmets, for professional level riding.
For the shock absorption ,test, a 5 kg round metal object is dropped onto ,the helmet, from a height of 1 m (corresponds to 49 J). The ,test, is deemed passed if the force transferred to the headform is < 5 kN. In the ,test, regarding penetration resistance a 3 kg sharp-edged object (30°) is dropped from a height of 1 m (corresponds to 29.5 J). The
Yes, agreed, it might not fully simulate the accident where you hit diesel while hanging off your Z1000 and bash your ,helmet, on a curbstone at a 15 degree angle then scrail it down the road for 100 yards, but it ,does, subject ,the helmet, to impacts from multiple sides and show which individual ,helmets, – all things being equal – perform best.
The ,test, day at Thunderhill was cold in the morning, in the high 50F range and stayed cold for quite some time due to rain and clouds. For me, cold air is a great ,test, of venting and flow rate, so I chose this testing regimen to assess ,helmet, ventilation.