SPEX SamplePrep 6750 CertiPrep Freezer/Mill Grinder

The SPEX SamplePrep 6750 CertiPrep Freezer/Mill is a benchtop cryogenic impact grinder. Specifically, it pulverizes structural, elastic, and temperature-sensitive matrices that standard mechanical mills cannot reduce. The system combines an electromagnetic impact mechanism with direct liquid nitrogen (LN2) cooling. Consequently, this design embrittles resilient materials rapidly while preventing thermal degradation, volatile analyte loss, and mechanical shear heating.

SPEX SamplePrep 6750 CertiPrep Operating Principle

During operation, users place samples inside a hermetically sealed polycarbonate or stainless steel vial. This vial rests directly inside an insulated liquid nitrogen reservoir. A magnetic shuttle drives a steel impactor between two end plugs at high speeds. Therefore, the impactor shatters the specimen through kinetic force rather than frictional heat. Furthermore, the liquid nitrogen bath maintains sub-zero temperatures throughout both pre-cooling and active grinding cycles. As a result, users reliably preserve heat-sensitive analytes such as RNA, DNA, enzymes, and volatile organic compounds.

Core Specifications & Controls

• Milling Frequency & Cycles: Operators program impact rates, run durations, and cooling intervals directly through the digital microprocessor panel.
• Sample Capacity: The chamber accepts standard grinding vials handling 0.1 g to 5 g batches, as well as multiple microvial formats.
• Closed-System Design: Sealed grinding vials prevent cross-contamination, airborne particulates, and atmospheric moisture exposure.
• Safety Protocols: Integrated lid interlocks immediately halt the magnetic driver when opened, while heavy-duty insulation limits cryogenic boil-off.

Key Laboratory & Research Applications

• Molecular Biology & Genomics: Pulverizing fibrous plant tissue, mammalian bone, teeth, skin, and cartilage for downstream nucleic acid extraction.
• Polymer & Material Science: Grinding ductile plastics, elastomers, tire rubber, and resins for spectroscopic analysis or additive profiling.
• Forensic & Environmental Testing: Processing trace evidence, hair samples, soils, and electronic components without volatilizing chemical markers.
• Pharmaceutical Formulation: Milling active pharmaceutical ingredients (APIs) and excipients without inducing thermal phase transitions.

In conclusion, the SPEX SamplePrep 6750 CertiPrep Freezer/Mill delivers consistent, contamination-free sample reduction for demanding biological and industrial materials. Because of its reliable temperature control, research laboratories can streamline difficult preparation workflows with repeatable analytical precision.