6775 Freezer Mill® – Cryogenic Grinding Mill
The 6775 Freezer/Mill® is SPEX’s small cryogenic grinding mill that accommodates sample sizes ranging from 0.1 – 5 grams. It is specifically designed for grinding and pulverising tough and/or temperature sensitive samples immersed in liquid nitrogen. It is capable of grinding almost anything.
Typical Samples
Typical samples that can be processed in the 6775 Freezer/Mill® include:
- Plant & animal tissues
- Seeds
- Plastic and Polymers
- Pharmaceuticals
- Food products
- Electronic components
- Textiles and fibres
- Hair
- Teeth
- Bones
Features
- Coil holds one Microvial Set or one Small Grinding Vial
- Equipped with liquid nitrogen level sensor and lid safety interlock for operator protection
- Grinding Vial Sets offered in a variety of materials including polycarbonate, stainless steel, and Cr-free steel
- Grinds samples in the 0.1 – 4 gram range
- Liquid nitrogen required for operation
- Magnetically driven impactor is the only moving part so there are no mechanical linkages or bearings to fail
- Pre-cooling chamber holds up to three additional grinding vials for high-throughput sample processing
- Programmable parameters include grinding time, impactor rate, pre-cooling and cooling times
- Small cryogenic impact grinder with self-contained liquid nitrogen tub and insulated case
- Stores up to 20 user-defined grinding programs for quick and easy recall
- Touch-screen control panel is detachable and can be used for remote operation
- Closed grinding vials eliminate sample cross-contamination
- Run history can be uploaded onto a USB memory stick
- Training videos can be viewed onscreen
Vial Volumes
| Micro | Small | |
|---|---|---|
| Maximum Capacity | 0.5mL | 4mL |
| Recommended Sample Capacity | 0.1-0.2mL | 1-2mL |
| Recommended Sample Capacity (approx) | 30-200mg | 1-4g |
Applications
SPEX Freezer Mills are suited to a wide range of different samples, these include:
Life Science
- DNA/RNA extraction
- Yeast analysis
- Pharmaceuticals
- Drug testing
- Cannabis research
- Food testing
- Animal tissue
- Plant tissue
- Human tissue (incl. hair, teeth, bones, etc.)
Materials Science
- Plastics and polymers
- Composite materials
- Textiles
- Electronics
- RoHS/WEEE
Application Examples
| Potato |  |  |  |
| Beef Lung |  | |  |
| Hair |  | |  |
| Polyethylene Beads |  | |  |
| Plastic Toys |  | |  |
| Dog Treats |  | |  |
Specifications
| CE Approved | Yes |
| Dimensions | 20.5 in (52cm) x 21.5 in (55cm) x 18 in (46cm) |
| Net Weight (lbs) | 44 lbs (24kg) |
| Gross Weight (lbs) | 53 lbs (24kg) |
| Voltage | 240V/50Hz |
| Timer/Controls | Touch-screen programmable controls for grinding cycles, time,impact rate, pre-cooling and cooling times. Stores 10 grinding programs |
Capabilities, Applications and Operation of the 6775 Freezer Mill
Note: the 6770 is the precursor to the 6775, with the latter containing the best components from the 6770 Freezer Mill.
Freezer Mill 6770 Used to Extract DNA from a Tooth Fragment for the First Time
Note: the 6770 is the precursor to the 6775, with the latter containing the best components from the 6770 Freezer Mill.
Spex Freezer Mill on CSI Miami
Note: the 6770 is the precursor to the 6775, with the latter containing the best components from the 6770 Freezer Mill.
End Plug Extractors
DNA Extraction Using a 6750 Freezer Mill
Forensic DNA work carried out by Newcastle University
| Micro | Small | Medium | Large | |
|---|---|---|---|---|
| Part No. | 6757 Polycarbonate cylinder, stainless steel end plugs and impactor | 6751 Polycarbonate cylinder, stainless steel end plugs and impactor | 6881 Polycarbonate cylinder, stainless steel end plugs and impactor | 6801 Polycarbonate cylinder, stainless steel end plugs and impactor |
| Maximum Capacity | 0.5mL | 4.0mL | 25mL | 50mL |
| Recommended Capacity | 0.1-.02mL | 1-2mL | 5-10mL | 10-20mL |
| Recommended Capacity | 30-200mg | 1-4g | 5-40g | 10-40g |
| Diameter (Length 137mm including end caps) | 9.5mm | 22mm | 38.5mm | 57mm |
| Freezer Mill 6770/6775 | 1 Set (3 total) | 1 | NA | NA |
| Freezer Mill 6870/6875 | 4 Sets (12 total) | 4 | 1 | 1 |
| Freezer Mill 6870D/6875D | 8 Sets (24 total) | 8 | 2 | 2 |
| Freezer Mill 6970 | 8 Sets (24 total) | 8 | 2 | 2 |
| Note: Capacities are a guide and will depend on density. |
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