The body has certified grades, namely N5, N6 and N7, to be used exclusively in utensils and kitchenware applications, a segment where corrosion due to substandard quality material is a matter of concern for consumers. "The Bureau of Indian Standards (BIS) has recently introduced three grades -- N5, N6 and N7 -- under the standard IS 15997, meant exclusively for stainless steel used in utensils and kitchenware applications," JSL said in a statement.