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- Ball Mills
- Planetary Ball Mills
- 4x100/4x500/4x1000ml Gear-Drive 0.4L / 2L / 4L Planetary Ball Mill
- Planetary Ball Mills
PQ-N04/2/4 series planetary ball mills may be used for mixing, homogenizing, fine grinding, mechanical alloying, cell disruption, small volume high-tech material production and even colloidal grinding. They are the ideal wet/dry milling tools for acquiring research samples with high efficiency and low noise. Vacuum jars may be used to process sample within a vacuum environment.
PQ-N04/2/4 planetary ball mills have four grinding stations arranged on the "Sun Wheel" of the planetary ball mill. When the Sun Wheel rotates, the grinding balls inside the jars are subject to superimposed rotational movements, known as Coriolis Forces. The difference in speeds between the grinding balls and jars produce an interaction between frictional and impact forces, which release high dynamic energies. Minimum granularity of the final product can be as small as 0.1 micron.
A timer controls running time from 1 to 999 minutes; it also controls jars' direction of rotation and intervals. We offer various sizes of grinding jars and grinding balls in different materials in our ball mill accessories section. Depending on your application, the material your grinding media is made from may be imperative to achieving accurate results.

Grinding methods
- Single direction without timing (samples need long or non-stop milling)
- Single direction with timing (samples need to be milled in one direction for a designated amount of time before automatic shutdown)
- Bi-direction with timing (samples need to run clockwise for 1.5 hours, then counter-clockwise for another 1.5 hours and so on, for 15 total hours, before the machine shuts down itself)
- Single direction with paused interval and timing (i.e. samples need to run for 0.5 hour, then pause for 1 hour, then run for another 0.5 hour in same direction and pause for another 1 hour, for 10 cycles before auto shutdown)
- Bi-direction with paused interval and timing (samples need to run clockwise for 0.8 hour, pause for 0.5 hour, then run counter-clockwise for 0.8 hour, for 20 cycles, before auto shutdown)
Features
- High uniformity and excellent repeatability
- Fast rotational speed, high efficiency and fine granularity
- Four samples with different sizes and materials in one experiment
- Leak-proof jars for wet grinding for purchase
- Large range of materials available for grinding media
- Gear-drive offers an effective solutions to problems caused by belt driving, such as belt creep and belt abrasion
- Low center of gravity, good rigidity, compact structure, low noise, safe and reliable operation
- Adjustable height
- Safety switch ensures automatic shut down if cover is opened during operation

DISCLAIMER
Achieving the desired particles via ball mill is a research project. The project depends on the material, grinding time, speed, and combination of grinding jar and quantity/size of milling ball. It is your responsibility to find the best milling procedure based on your material. Across International offers paid sample testing prior purchase.
Please be advised that the paid sample testing is implemented to establish a general base line for the experimental procedure. Depending on the present conditions that are applied to the unit, the results may vary if the process is repeated elsewhere.
Note:
1. Except stainless steel jars, all other jars must use stainless steel vacuum jackets when used in vacuum condition.
2. Vacuum jars or jackets must be operated with a vacuum pump which sold separately.
| Specification | PQN04 | PQN2 | PQN4 |
| Nominal size | 0.4 L | 2 L | 4 L |
| Electrical requirements | 220–240 V, 50 Hz, single phase | 240 V, 50 Hz, single phase | 240 V, 50 Hz, single phase |
| Power shown in original specifications | 370 W | 750 W | 2,200 W |
| Power shown in new table | 0.37 kW | 0.75 kW | 1.5 kW |
| Compatible non-vacuum jars | 100 ml × 4 | 500 ml × 4 | 1,000 ml × 4 |
| Compatible vacuum jars | 50 ml × 4 | 250 ml × 4 | 500 ml × 4 |
| Operation mode | Two or four grinding jars working simultaneously | Two or four grinding jars working simultaneously | Two or four grinding jars working simultaneously |
| Maximum feeding capacity | ⅔ of grinding jar capacity | ⅔ of grinding jar capacity | ⅔ of grinding jar capacity |
| Sun wheel vs planetary wheel speed ratio | — | — | — |
| Feeding granularity | Soil ≤10 mm; other materials ≤3 mm | Soil ≤10 mm; other materials ≤3 mm | Soil ≤10 mm; other materials ≤3 mm |
| Final granularity | Down to 0.1 micron | Down to 0.1 micron | Down to 0.1 micron |
| Maximum continuous operating time | 72 hours | 72 hours | 72 hours |
| Maximum jar rotation speed | 600 rpm | 580 rpm | 530 rpm |
| Unit dimensions in original specifications | 610 × 360 × 450 mm (D×W×H); 810 mm high with cover open | 760 × 460 × 640 mm (D×W×H); 1,120 mm high with cover open | 790 × 460 × 690 mm (D×W×H) |
| Outside dimensions in new table | 360 × 575 × 470 mm | 460 × 760 × 600 mm | 460 × 760 × 680 mm |
| Shipping dimensions | 690 × 430 × 580 mm | 1,020 × 560 × 840 mm | 1,020 × 580 × 810 mm |
| Unit weight | 77 kg | 132 kg | — |
| Shipping weight | 104 kg | 163 kg | 181 kg |
| Specification | PQN12 | PQN20 |
| Nominal size | 12 L | 20 L |
| Electrical requirements | 220–240 V, 50/60 Hz, single phase or 415 VAC, 50/60 Hz, three phase | 220–240 V, 50/60 Hz, single phase or 415 VAC, 50/60 Hz, three phase |
| Power shown in original specifications | 4,000 W | 5,000 W |
| Power shown in new table | 4 kW | 5.5 kW |
| Compatible non-vacuum jars | 3 L × 4 | 5 L × 4 |
| Compatible vacuum jars | 2 L × 4 | 4 L × 4 |
| Operation mode | Two or four grinding jars working simultaneously | Two or four grinding jars working simultaneously |
| Maximum feeding capacity | ⅔ of grinding jar capacity | ⅔ of grinding jar capacity |
| Sun wheel vs planetary wheel speed ratio | 01:01.9 | 01:01.5 |
| Feeding granularity | Soil ≤10 mm; other materials ≤3 mm | Soil ≤10 mm; other materials ≤3 mm |
| Final granularity | Down to 0.1 micron | Down to 0.1 micron |
| Maximum continuous operating time | 72 hours | 72 hours |
| Maximum jar rotation speed | 440 rpm | 270 rpm |
| Unit dimensions in original specifications | 1,020 × 610 × 710 mm (D×W×H) | 970 × 660 × 750 mm (L×W×H) |
| Outside dimensions in new table | 1,080 × 640 × 750 mm | 1,130 × 720 × 810 mm |
| Shipping dimensions | — | 1,170 × 760 × 1,020 mm |
| Unit weight | — | — |
| Shipping weight | 310 kg | 386 kg |
Note: If the feed size exceeds the specified limits—≤10 mm for soil materials and ≤3 mm for other materials—preliminary size reduction is required.

Note:
1. Except stainless steel jars, all other jars must use stainless steel vacuum jackets when used in vacuum condition.
2. Vacuum jars or jackets must be operated with a vacuum pump which sold separately.

