Thanks for the info, goldfinch.
I'm not surprised..I've worked in engineering libraries where we had info. on engineering materials...which includes hard plastics.
Until my helmet crashes somewhere or gets dropped enough on hard surfaces, I'm not going to worry about it.
I've had 4 different helmets over the past 20 years of regular cycling. Right now I have 2, in 2 different cities when I ride.
Meanwhile for the anti-helmet lobby, this thread would look strange to them.



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