Whats the difference between parts per million (PPM) and WT% when measuring the zinc content in motor oil? For instance the zinc content in Lucas 20-50 "racing only" dino oil is expressed as: 3,132 PPM. In Valvoline NSL 20-50 synthetic its expressed as ZNWT% 0.14. Is it possible to convert the % as expressed in the Valvoline oil to PPM or PPM to WT%? Any insight appreciated.
% of Zinc in oil vs PPM
- Thread starter 331mike
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I'm not sure if it's correct, but a rough-and-ready conversion would multiply the % value by 10,000 to get parts per million.
0.14% is 0.001400 which is 1,400 ppm. Of course, that assumes it's the same basis - weight:weight or weight:volume or whatever.
0.14% is 0.001400 which is 1,400 ppm. Of course, that assumes it's the same basis - weight:weight or weight:volume or whatever.
This sounds about right. From the SAE papers I have read the API SM spec brought down the ZDDP to .08%.
Originally Posted By: 331mike
Whats the difference between parts per million (PPM) and WT% when measuring the zinc content in motor oil? For instance the zinc content in Lucas 20-50 "racing only" dino oil is expressed as: 3,132 PPM. In Valvoline NSL 20-50 synthetic its expressed as ZNWT% 0.14. Is it possible to convert the % as expressed in the Valvoline oil to PPM or PPM to WT%? Any insight appreciated.
This is why paying attention in school pays off in "real" life. OK OK I am giving BITOG too much credit
1% equals 1 part per hundred, so it also equals 10 parts per thousand, 100 parts per ten thousand, 1000 parts per hundred thousand or 10000 parts per million, so .14% is 1400 ppm - just move the decimal point and drop in zeros.
Whats the difference between parts per million (PPM) and WT% when measuring the zinc content in motor oil? For instance the zinc content in Lucas 20-50 "racing only" dino oil is expressed as: 3,132 PPM. In Valvoline NSL 20-50 synthetic its expressed as ZNWT% 0.14. Is it possible to convert the % as expressed in the Valvoline oil to PPM or PPM to WT%? Any insight appreciated.
This is why paying attention in school pays off in "real" life. OK OK I am giving BITOG too much credit
1% equals 1 part per hundred, so it also equals 10 parts per thousand, 100 parts per ten thousand, 1000 parts per hundred thousand or 10000 parts per million, so .14% is 1400 ppm - just move the decimal point and drop in zeros.
JHZR2
Staff member
1 ppmw is 1 mg/kg of product.
You can find the density of oil and then figure it out any way you like.
You can find the density of oil and then figure it out any way you like.
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