To prevent lubricating fluid and grinding debris from mechanical seal components from contaminating products inside the reactor, we have introduced modular dry-operation single-end-face and double-end-face modular mechanical seals. All materials in contact with these seals meet GMP and FDA certification requirements. Under inert gas protection, minimal end-face grinding debris is collected and discharged completely, and the seals can be periodically sterilized. This solves the technical challenges of high-requirement mechanical seals in the pharmaceutical and food industries.