Regulatory documents, such as EU Regulation 10/2011, set limits for heavy metals in food contact polymers, typically capping total heavy metals at 100 ppm for lead, cadmium, mercury, and hexavalent chromium. Specific migration limits (SMLs) are also established to ensure safety in food contact materials.
Dear Sharad Medhe, just consult the USA FDA regulations on your query, these are free access either on their website or by doing google search. Attached is a sample document. My Regards