21 CFR 177.2600 is a United States rule for rubber articles intended for repeated food contact. It addresses permitted ingredients and extractive limits under stated test conditions. It is not a blanket approval of every O ring or mechanical seal made from the same material family. The claim must match the actual compound and the conditions of use.
Ask for the supplier declaration naming the exact compound, applicable rule and intended food contact conditions. Check traceability from that declaration to the part delivered. Some food contact materials may rely on another valid regulatory route, such as a Food Contact Notification. Do not assume every FFKM or EPDM compound follows the same route. And do not confuse a food contact declaration with proof that the seal will withstand caustic cleaning, hot water or the pump duty.
For a UK or European food plant, check the applicable local requirements with your quality team as well. I would use the declaration to answer a precise compliance question, then assess seal performance against the actual process.
Andrew Sykes | Acumen Seals & Pumps Limited | Independent mechanical seals and sealing specialist