O rings

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Trev-h

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Just replaced a o ring in my krait with a nbr90 o ring and it's now doing has it should but while trying to locate the rings some came up with shore90 my question is are nbr90 and shore90 the same thing would like to know for future reference I did try a nbr70 which didn't last long before blew again
Thanks
 
Trev-h said:
Just replaced a o ring in my krait with a nbr90 o ring and it's now doing has it should but while trying to locate the rings some came up with shore90 my question is are nbr90 and shore90 the same thing would like to know for future reference I did try a nbr70 which didn't last long before blew again
Thanks
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NBR is Nitrile Butadiene Rubber and the shore value is essentially the hardness, 70 probably being the commonest. Where is the o-ring on your Krait ?
 
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In the exhaust valve Chris did drop some off for me which I much appreciated but unfortunately they were the wrong size but he did say they were nbr90 which I managed to get of the Internet and all good but alot said they were shore90 just had me thinking that they were the same thing but wasn't sure
 
Google wonderful thing apparently the shore number is the hardness of the rubber o ring so now the question is which is better nitrile or rubber?
 
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