Selecting the correct material is one of the most critical decisions in fluid system design.
To ensure your systems last and avoid unexpected failures,
you must match the diaphragm to the specific chemical profile of your media.
Using the wrong material can lead to premature wear, leaks, and expensive downtime.
Below is a simple reference guide to the five most common diaphragm materials and their best use cases.
| Material | Acid | Alkali | Oil | Available temperature | Best For |
| NBR | X | X | Excellent | -5~+80℃ | Oils, Fuel, Air, Water |
| EPDM | Excellent | Excellent | X | -5~+130℃ | Hot Water, Steam, Alkalis |
| VITON | Excellent | moderate | Excellent | -5~+130℃ | Harsh Chemicals, High Heat |
| SILICONE | moderate | X | moderate | -5~+130℃ | Food Grade, Low/High Temps |
| PTFE | Excellent | Excellent | Excellent | -5~+185℃ | Almost All Chemicals |
Note:
* PTFE is chemically inert but less flexible than elastomers.
* Always check the concentration and temperature of your media before finalizing your choice.