MJ14LN600 600 mL PTFE Milling Jar with Liquid Nitrogen Cooling Jacket and Vacuum Insulation for Cryogenic Grinding
The MJ14LN600 milling jar is engineered to enable grinding of materials that are too flexible or sensitive to be processed at ambient temperatures. It is specifically designed for cryogenic milling tasks where maintaining extremely low temperatures is critical to prevent contamination and preserve material integrity. This milling jar is ideal for laboratories requiring precise low-temperature grinding using conventional rolling mills.
This system features a 600 mL PTFE inner jar housed within a liquid nitrogen cooling jacket and an outer vacuum insulation layer. The cooling jacket can hold up to 1.5 liters of liquid nitrogen, enabling the jar to be rotated at temperatures near that of liquid nitrogen. The vacuum insulation minimizes thermal radiation, enhancing temperature stability during milling. The jar is driven by two 185 mm diameter wheels positioned at each end, compatible with rolling mills having 150 to 185 mm open spacing between rollers.
Key Features
- 600 mL PTFE inner jar (92 mm outer diameter, 79 mm inner diameter, 127 mm length) resistant to iron contamination
- Liquid nitrogen cooling jacket with 1.5 L capacity for maintaining cryogenic temperatures
- Vacuum insulation layer to reduce heat transfer and thermal radiation
- Over-pressure safety relief valve activates above 3.7 atm (55 PSI) for safe operation
- Compatible with conventional rolling mills with 150–185 mm roller spacing
- Includes one set of yttria-stabilized zirconia (YSZ) milling balls for immediate use
- Built-in T-type thermocouple for temperature monitoring (monitor not included)
Technical Specifications
| Parameter | Specification |
|---|---|
| Inner Jar Material | PTFE |
| Inner Jar Dimensions (O.D. x I.D. x Length) | 92 mm x 79 mm x 127 mm (638 mL volume) |
| Cooling Jacket Capacity | 1.5 liters liquid nitrogen |
| Operating Temperature Range | Below -130°C without heating; down to -150°C max with optional mini heating gun |
| Safety Valve Pressure | Opens above 3.7 atm (55 PSI) |
| Drive Wheels Diameter | 185 mm |
| Compatible Roller Mill Spacing | 150–185 mm |
| Included Milling Balls | YSZ (yttria-stabilized zirconia) set |
| Weight | 30.2 lb (13.7 kg) |
Typical Applications
This milling jar is suited for cryogenic grinding of materials that are heat-sensitive, flexible, or prone to contamination by iron during milling. It is commonly used in advanced material research, pharmaceuticals, and nanomaterial preparation where low temperature milling preserves sample properties.
Configuration & Operating Notes
- The jar requires a rolling mill with 150–185 mm open spacing between rollers for operation.
- A temperature monitor is necessary to track the internal temperature; it is not included.
- Optional accessories include a dual mini heating gun to prevent freezing during rotation and an automatic temperature control system with vacuum pump to reduce heat loss.
- Liquid nitrogen must be handled with appropriate safety precautions including gloves and goggles.
- Pre-cooling the tank and maintaining low humidity (<48%) in the environment are essential to avoid freezing and ensure smooth rotation.
Safety Warning
- Always wear protective gloves and safety goggles when filling liquid nitrogen into the tank.
- Users inexperienced with liquid nitrogen handling should consult safety notes and experts before operation.
- The manufacturer is not responsible for damages caused by improper handling or neglect of safety procedures.
