Sapphire Piston

Sapphire Pistons are a consumable part of the HPLC pump and should be replaced on a regular preventative maintenance schedule.

It offers optimal concentricity and resistance to wear.  The rod tolerance is tightly controlled during the machining process, resulting in a piston with maximal resistance to breakage and superior wear characteristics. The sapphire rods are attached to ferrules (generaly with high standard stainless steel)using a proprietary process that provides maximum control over concentricity, an important parameter that has a direct effect on seal lifetime.