② Alkalis

At room temperature, STC-1 and 9000#, 862-200B# enamels is fully resistant to chemical media in any PH values. But with the rise of temperature, the resistance of the enamels  to alkali decreases. For the service to the caustic soda and caustic potash at PH 14 or more, the maximum operation temperatures at the different concentrations are: 66℃ at 10%, 60℃ at 20%, 57℃ at 30%, 54℃ at 50% respectively.
For operation of neutralization, maximum allowable temperature is 100℃ at PH 13. When liquid alkaline or solid alkaline is charged into a vessel, care should be taken to put the material into the center of the vessel and agitating should be carefully so that it may not cause either sticking of the material to the surface of enamel or overheating on the local area in the vessel.
Organometallic compounds except fluorides do not influence the enamels under the normal condition.