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нежелательные примеси stresses
forestr.	contraries (в тряпье)
met.	subversive trace elements (напр., в чугуне VLZ_58)
microbiol.	unintended impurities (kefiring)
pulp.n.paper	contraries (напр. в тряпье)
нежелательная примесь
dril.	impurity
Makarov.	objectionable admixture
math.	unwanted impurities
med.	adulterant (к веществу)
microel.	contamination; contaminant; contaminating impurity
phys.	undesirable impurity
tech.	foreign material; foreign matter; foreign substance

нежелательные примеси: 3 phrases in 3 subjects

Metallurgy	1
Road works	1
Technology	1