Retsch Planetary Ball Mill PM 400 MA, 220–230 V, 50/60 Hz, with 4 grinding stations, speed ratio 1 : -3, for mechanical alloying, on wheels (please order grinding jars and balls separately)

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Planetary Ball Mills are used wherever the highest degree of fineness is required. Apart from the classical mixing and size reduction processes, the mills also meet all the technical requirements for colloidal grinding and have the energy input necessary for mechanical alloying processes. The extremely high centrifugal forces of planetary ball mills result in very high pulverization energy and therefore short grinding times.

The PM 400 is a robust floor model with 4 grinding stations.

You may also be interested in the High Energy Ball Mill Emax, an entirely new type of mill for high energy input. The unique combination of high friction and impact results in extremely fine particles within the shortest amount of time.

Application Examples

alloys, bentonite, bones, carbon fibres, catalysts, cellulose, cement clinker, ceramics, charcoal, chemical products, clay minerals, coal, coke, compost, concrete, electronic scrap, fibres, glass, gypsum, hair, hydroxyapatite, iron ore, kaolin, limestone, metal oxides, minerals, ores, paints and lacquers, paper, pigments, plant materials, polymers, quartz, seeds, semi-precious stones, sewage sludge, slag, soils, tissue, tobacco, waste samples, wood, ... continue to application database

Product Advantages

  • powerful and quick grinding down to nano range
  • reproducible results due to energy and speed control
  • suitable for long-term trials
  • 2 different grinding modes (dry and wet)
  • optional pressure and temperature measuring system PM GrindControl
  • measurement of energy input
  • wide range of materials for contamination free grinding
  • Safety Slider for safe operation
  • comfortable parameter setting via display and ergonomic 1-button operation
  • automatic grinding chamber ventilation
  • 10 SOPs can be stored
  • programmable starting time
  • power failure backup ensures storage of remaining grinding time
  • jars with O-type sealing for safe operation, pressure tight
Call 01463 830401 For Any Assistance


Applicationspulverizing, mixing, homogenizing, colloidal milling, mechanical alloying
Field of applicationagriculture, biology, Chemistry, construction materials, engineering / electronics, environment / recycling, geology / metallurgy, glass / ceramics, medicine / pharmaceuticals
Feed materialsoft, hard, brittle, fibrous - dry or wet
Size reduction principleimpact, friction
Material feed size*< 10 mm
Final fineness*< 1 µm, for colloidal grinding < 0.1 µm
Batch size / feed quantity*max. 4 x 220 ml, max. 8 x 20ml with stacked grinding jars
No. of grinding stations4 / 2
Speed ratio1:-2 / 1:-2.5 / 1:-3
Sun wheel speed30 - 400 min-1
Effective sun wheel diameter300 mm
G-force26.8 g
Type of grinding jars"comfort", optional areation covers, safety closure devices
Material of grinding toolshardened steel, stainless steel, tungsten carbide, agate, sintered aluminium oxide, silicon nitride, zirconium oxide
Grinding jar sizes12 ml / 25 ml / 50 ml / 80 ml / 125 ml / 250 ml / 500 ml
Setting of grinding timedigital, 00:00:01 to 99:59:59
Interval operationyes, with direction reversal
Interval time00:00:01 to 99:59:59
Pause time00:00:01 to 99:59:59
Storable SOPs10
Measurement of input energy possibleyes
InterfaceRS 232 / RS 485
Drive3-phase asynchronous motor with frequency converter
Drive power1.5 kW
Electrical supply datadifferent voltages
Power connection1-phase
Protection codeIP 30
Power consumption~ 2100 W (VA)
W x H x D closed836 x 1220 (1900) x 780 mm
Net weight~ 290 kg
Patent / Utility patentSafetySlider (DE 202008008473)

Please note:
*depending on feed material and instrument configuration/settings

Function Principle

The grinding jars are arranged eccentrically on the sun wheel of the planetary ball mill. The direction of movement of the sun wheel is opposite to that of the grinding jars in the ratio 1:-2 (or 1:-2.5 or 1:-3).
The grinding balls in the grinding jars are subjected to superimposed rotational movements, the so-called Coriolis forces. The difference in speeds between the balls and grinding jars produces an interaction between frictional and impact forces, which releases high dynamic energies. The interplay between these forces produces the high and very effective degree of size reduction of the planetary ball mill.

Subject to technical modifications and errors


    • SKU
  • Manufacturer
    Retsch GmbH
  • Country of Origin

Accessories PM 100 / PM 200 / PM 400

03.025.0002Adapter for stacking grinding jars “comfort”, 50 ml, hardened steel, stainless steel, for PM 100 and PM 400

03.025.0003Adapter for stacking grinding jars “comfort”, 50 ml, tungsten carbide, agate, sintered aluminum oxide, zirconium oxide, for PM 100 and PM 400

02.728.0048Opening aid for clamping unit

99.200.0009IQ/OQ Documentation for PM 400


Grinding jars “comfort” PM 100 / PM 200 / PM 400

Hardened steel

01.462.014550 ml

01.462.0144125 ml

01.462.0224250 ml

01.462.0229500 ml


Stainless steel

01.462.023912 ml

01.462.024025 ml

01.462.014950 ml

01.462.032180 ml

01.462.0148125 ml

01.462.0223250 ml

01.462.0228500 ml


Tungsten carbide

01.462.015650 ml

80 ml

01.462.0155125 ml

01.462.0222250 ml



01.462.013950 ml

01.462.019780 ml

01.462.0136125 ml

01.462.0220250 ml

01.462.0225500 ml


Sintered aluminum oxide

01.462.015350 ml

01.462.0152125 ml

01.462.0221250 ml

01.462.0226500 ml


Silicon nitride (other volumes upon request)

125 ml

250 ml

500 ml


Zirconium oxide

01.462.018850 ml

01.462.0187125 ml

01.462.0219250 ml

01.462.0227500 ml


Accessories for grinding jars “comfort”

for grinding with inert atmosphere and Mechanical Alloying (MA)
Aeration lid for grinding jar “comfort” 50 ml, stainless steel

Aeration lid for grinding jar “comfort” 125 ml, stainless steel

22.107.0005Aeration lid for grinding jar “comfort” 250 ml, stainless steel

22.107.0006Aeration lid for grinding jar “comfort” 250 ml, tungsten carbide

22.107.0014Aeration lid for grinding jar “comfort” 250 ml, zirconium oxide

22.107.0017Aeration lid for grinding jar “comfort” 500 ml, hardened steel

22.107.0007Aeration lid for grinding jar “comfort” 500 ml, stainless steel

22.107.0012Aeration lid for grinding jar “comfort” 500 ml, agate

22.107.0013Aeration lid for grinding jar “comfort” 500 ml, sintered aluminum oxide

22.107.0010Aeration lid for grinding jar “comfort” 500 ml, zirconium oxide

22.867.0002Safety closure device for grinding jars “comfort” 50 ml

22.867.0007Safety closure device for grinding jars “comfort” 80 ml, agate or tungsten carbite /
and for grinding jars “comfort” 125 ml

22.867.0003Safety closure device for grinding jars “comfort” 80 ml, stainless steel

22.867.0004Safety closure device for grinding jars “comfort” 250 ml

22.867.0005Safety closure device for grinding jars “comfort” 500 ml


O-rings for grinding jars “comfort”

05.114.0057O-ring for grinding jars “comfort” 50 ml, 1 piece

05.114.0121O-ring for grinding jars “comfort” 80 ml, tungsten carbide, 1 piece

05.114.0056O-ring for grinding jars “comfort” 80 ml, agate and stainless steel /
for grinding jars “comfort” 125 ml, 1 piece

05.114.0055O-ring for grinding jars “comfort” 250 ml, hardened steel, stainless steel, tungsten carbide and silicon nitride, 1 piece

22.085.0010O-ring for grinding jars “comfort” 250 ml, agate, sintered aluminum oxide and zirconium oxide, 1 set

05.114.0054O-ring for grinding jars “comfort”, 500 ml, hardened steel and stainless steel, 1 piece

22.085.0011O-ring for grinding jars “comfort”, 500 ml agate, sintered aluminum oxide, silicon nitride and zirconium oxide, 1 set


Grinding balls

Hardened steel

05.368.00295 mm Ø

05.368.00307 mm Ø

05.368.005910 mm Ø

05.368.003212 mm Ø

05.368.010815 mm Ø

05.368.003320 mm Ø

05.368.005730 mm Ø

05.368.005640 mm Ø


Stainless steel

22.455.00102 mm Ø, 500 g (approx. 110 ml)

22.455.00113 mm Ø, 500 g (approx. 120 ml)

22.455.00023 mm Ø, 200 pieces (approx. 6 ml)

22.455.00014 mm Ø, 200 pieces (approx. 14 ml)

22.455.00035 mm Ø, 200 pieces (approx. 25 ml)

05.368.00345 mm Ø

05.368.00357 mm Ø

05.368.006310 mm Ø

05.368.003712 mm Ø

05.368.010915 mm Ø

05.368.006220 mm Ø

05.368.010525 mm Ø

05.368.006130 mm Ø

05.368.006040 mm Ø


Tungsten carbide

22.455.00063 mm Ø, 200 pieces (approx. 6 ml)

22.455.00054 mm Ø, 200 pieces (approx. 14 ml)

22.455.00045 mm Ø, 200 pieces (approx. 25 ml)

05.368.00385 mm Ø

05.368.00397 mm Ø

05.368.007110 mm Ø

05.368.004112 mm Ø

05.368.011015 mm Ø

05.368.007020 mm Ø

05.368.006930 mm Ø

05.368.006840 mm Ø



05.368.00245 mm Ø

05.368.00257 mm Ø

05.368.006710 mm Ø

05.368.002712 mm Ø

05.368.011115 mm Ø

05.368.002820 mm Ø

05.368.006530 mm Ø

05.368.006440 mm Ø


Sintered aluminum oxide

05.368.00195 mm Ø

05.368.002110 mm Ø

05.368.011215 mm Ø

05.368.005420 mm Ø

05.368.005330 mm Ø

05.368.005240 mm Ø


Silicon nitride

05.368.008810 mm Ø

05.368.008520 mm Ø

05.368.008630 mm Ø

05.368.008740 mm Ø


Zirconium oxide

32.368.00050.1 mm Ø, 0.5 kg (approx. 135 ml)

32.368.00030.5 mm Ø, 0.5 kg (approx. 135 ml)

32.368.00041 mm Ø, 0.5 kg (approx. 135 ml)

05.368.00892 mm Ø, 0.5 kg (approx. 135 ml)

05.368.00903 mm Ø, 0.5 kg (approx. 140 ml)

22.455.00073 mm Ø, 200 pieces (approx. 6 ml)

22.455.00095 mm Ø, 200 pieces (approx. 25 ml)

05.368.009410 mm Ø

05.368.009612 mm Ø

05.368.011315 mm Ø

05.368.009320 mm Ø

05.368.009230 mm Ø

05.368.009140 mm Ø