SPEX CertiPrep 6850 Freezer Mill Cryogenic Mill

Technical Notes:

The unit powers on, and the display is fully functional. A complete operational test was performed using a stainless steel grinding vial set. With the chamber empty, the low-LN₂ alarm was active; once the chamber was filled with liquid nitrogen, the alarm cleared, confirming that the liquid nitrogen level sensor is functioning properly. All control buttons are responsive, and the lid open/close motor operates correctly. During the run, the impactor was audible, consistent with normal operation. This unit does not include the optional auto-fill accessory (SPEX 6820). See video for more detail

Model Description:

The SPEX CertiPrep 6850 Freezer Mill is a cryogenic grinding system designed to pulverize tough, temperature-sensitive samples into fine powders using liquid nitrogen cooling. It's widely used in materials science, pharmaceutical, forensic, and polymer research labs for preparing samples that resist grinding at room temperature.

Highlights

• Cryogenic grinding via liquid nitrogen bath prevents heat degradation and sample loss
• Magnetically driven impactor pulverizes samples through rapid back-and-forth motion
• Suited for polymers, plant tissue, rubber, composites, and other elastic or heat-sensitive materials
• Enables reproducible particle size reduction for downstream analytical testing