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Piston valves - Table of chemical resistance - page 5
1) Piston and piston shaft in 1.4404 (please specify when ordering).
2) Discoloration may occur.
3) With heat-transfer media please inquire in our Gumpoldskirchen factory regarding choice of valve rings. Please state the type of medium and the temperature range. Cast iron is chemically resistant to heat transfer media but, in view of the ability of these media to penetrage the pores, it is not recommended
4) All ferrous materials are resistant to hydrogen; it is pointed out, however, that hydrogen diffuses through cast iron and can cause embrittlement.
5) 150 °C