Common lining materials for magnetic flowmeters: polytetrafluoroethylene, polytetrafluoroethylene (F-4), tetrafluoroethylene, and Hexafluoropropylene (F-46), tetrafluoroethylene and ethylene (F-40), polyurethane rubber, neoprene, acid-resistant enamel, ceramics, acid-resistant rubber.
The following table can explain the performance of different lining materials, the maximum working temperature, and the liquid that is suitable for measurement.
| Name | Performance | Maximum operating temperature /℃ |
Suitable liquid |
| Polytetrafluoroethylene | Poor wear resistance | 100 | Water, acid solution |
| Polytetrafluoroethylene (F-4) | Poor bonding performance, difficult to bond with metal measuring tubes, and poor wear resistance |
250 | Strongly corrosive concentrated acid, alkali, salt solution |
| Tetrafluoroethylene and Hexafluoropropylene (F-46) |
The chemical resistance is slightly inferior to F-4, but it has a strong bond with the metal measuring tube and can be used for negative pressure |
Corrosive acid, alkali, salt solution | |
| Tetrafluoroethylene and ethylene (F-40) |
The chemical resistance is slightly inferior to F-4, but it has a strong bond with the metal measuring tube and can be used for negative pressure |
Corrosive acid, alkali, salt solution | |
| Polyurethane rubber | Good wear resistance, but poor acid and alkali resistance |
70 | Cement slurry, paper pulp liquid |
| Neoprene | Good elasticity, wear resistance, corrosion resistance, good impact resistance, and low cost |
70 | Cement slurry, mineral slurry, dilute acid fluid |
| Acid-resistant enamel | Has certain alkali resistance, poor impact resistance |
180 | General acid and alkali corrosive liquid |
| Ceramics | It has excellent abrasion resistance, and good corrosion resistance to various strong acids and alkalis, but it is brittle and fragile and should be protected from sudden temperature changes |
180 | Corrosive pulp |
| Acid-resistant rubber | Withstand any concentration of hydrochloric acid, oxalic acid, phosphoric acid and 50% sulfuric acid, NaOH, KOH, etc. below 60℃, but avoid strong oxidants |
60 | General acid, alkali, salt solution |