https://www.tymagnetics.com/products/ferrite-segment-magnets.html
Ferrite segment magnets are a type of permanent magnet made from a combination of iron oxide and barium or strontium carbonate. These magnets are known for their high resistance to demagnetization and their ability to retain magnetic properties over a long period of time.
UTMOST different types of valves used in oil and gas industry can meet the strict requirements of high-precision and stable control by chemical companies with control valve solution.
https://www.utmostvalve.com/utmost-valves-for-petrochemical-industry.html