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Russian to English translations [PRO] Tech/Engineering - Geology / component of raw material
Russian term or phrase:НПП or ИПП
one of a list of percentages of components in the raw material of a chalk deposit.
The largest percentage apart from CaO.
The print is not clear, I can only see the two vertical bars of the first letter, so it could be H or И.
Couldn't find anything for НПП, and the only material for ИПП that I could find is изо-тактический полипропилен, which doesn't sound to me like something that occurs naturally.