How to choose mechanical seal and material for fluorine plastic pump
Generally speaking, the fluorine plastic pump will choose WB2 external single-end face grinding seal, which is simple in structure and easy to watch.
Main material: Silicon nitride anti-grinding silicon nitride; Silicon carbide against grinding silicon carbide; Ceramic to grinding ceramics; Press-free sintering against grinding press-free sintering. Different materials are suitable for different working conditions.
Mechanical seals are essential assembly parts in IHF, FSB, GDF centrifugal pumps, and are easily damaged parts in accessories.
Fluoric acid medium:
Reacts with silicon nitride: Si3N4+12HF═3SiF4+4NH3↑
Reaction with silica in ceramics: SiO2+4HF=2H2O+SiF4
Reaction with silicon carbide: SiC+4HF=SiF4+CH4
Sodium hydroxide (caustic soda) :
The main components of ceramics are SiO2,2NaOH+SiO2=Na2SiO3+H2O
Reaction with silicon carbide, reaction equation: SiC+2NaOH+H2O==Na2SiO3+C+2H2
