In the machining workshop of a factory, the mechanical seal leakage of the chip liquid conveying pump occurred. When the pump was opened, the rubber seal of the old machine was found to swell, become soft and tear. As shown in figure:
Look closely at the machine seal rubber on the E mark, indicating that the original material is EPDM, known as EPDM.
The pump is used to transport the cutting fluid of the machine tool, so the material contains oil, but the rubber material of the machine seal is EPDM oil resistant, so the machine seal has not been used for long, and the mechanical seal is damaged.
So in the selection of appropriate materials, we need to consider the application conditions, whether oil resistance, acid and alkali resistance, high temperature resistance, and so on.