Washington ? Federal regulators set a safety threshold Friday for the industrial chemical melamine that is greater than the amount of contamination found so far in U.S.-made infant formula.

Food and Drug Administration officials set a threshold of 1 part per million of melamine in formula, provided a related chemical isn’t present. They insisted the formulas are safe.

The setting of the standard comes days after The Associated Press reported that FDA tests had found traces of melamine in the infant formula of one major U.S. manufacturer and cyanuric acid, a chemical relative, in the formula of a second major maker.

The contaminated samples, which both measured at levels below the new standard, had been analyzed several weeks ago.