GENEQ > Materials testing > Mills

Planetary Ball Mills
Model PM 100 & PM 200

Highest degree of fineness in the shortest time
 The new RETSCH planetary ball mills are used wherever the highest degree of fineness is demanded. Apart from the classical mixing and size reduction processes, the Planetary Ball Mills PM 100 and PM 200 meet all the technical requirements for colloidal grinding and also have the necessary energy input for a mechanical alloying process.
Together with the “Comfort” grinding jars the new RETSCH Planetary Ball Mills offer the highest possible degree of performance, safety and reliability.

BENEFITS
  • Extreme fineness down to the submicron range
  • Up to 50% higher energy input compared with comparable planetary mills for the optimal grinding of even difficult products
  • Large grinding jars can also be used 1 x 500 ml (PM 100); 2 x 125 ml (PM 200)
  • High sample throughput resulting from large sample volumes and short grinding times
  • Also suitable for long-term trials and continuous use
  • Speed control ensures reproducible results
  • Convenient parameter setting via graphics display and ergonomic 1-button operation
  • Memory function for 10 parameter combinations
  • Contamination-free grinding with grinding jars made from 6 different materials
  • Low-noise bench-top model due to optimal grinding jar balancing and exact grinding jar centering
  • Safety plastic housing with automatic cover closure
  • Patented safety clamping device with automatic locking for simple and secure grinding jar clamping
  • Forced ventilation of chamber allows the safe use of the mills for applications requiring solvents
RETSCH planetary ball mills pulverize and mix soft, medium-hard to extremely hard, brittle and fibrous materials. Both wet and dry grinding can be carried out. Minerals, ores, alloys, chemicals, glass, ceramics, plant materials, soil samples, sewage sludge, household and industrial waste and many other substances can be reduced in size simply, quickly and without loss.
Planetary ball mills have been successfully used in virtually all industrial and research sectors, in particular wherever high demands are placed on purity, speed, fineness and reproducibility. The planetary ball mills produce extremely high centrifugal forces with very high pulverization energies and therefore short grinding times.

TWO VERSIONS
Model PM100
Model PM200
PM 200 – a benchtop model with two grinding stations for 50 or 125 ml grinding jars
PM 100 – the versatile benchtop model with a single grinding station for 50 to 500 ml grinding jars

SPECIFICATIONS
PM 100
PM 200
Performance data
Applications Size reduction, mixing, homogenizing, colloidal milling, mechanical alloying
Feed material Soft, hard, brittle, fibrous; wet or dry
Feed size <10 mm <4 mm
Grind size* <1 µm <1 µm
Grind size* (colloidal grinding) <0.1 µm <0.1 µm
Grinding jar volumes “Comfort”
50 / 125 / 250 / 500 ml 		“Comfort”
50 / 125 ml
Useful volume (sample and balls) max. 1 x 300 ml max. 2 x 80 ml
Useful volume (sample and balls) with stacked grinding jars max. 2 x 30 ml -
No. of grinding stations 1 2
Set speed ratio 1 : -2 1 : -2
Max. sun wheel speed 100 - 650 min-1 100 - 650 min-1
Effective sun wheel dia. 141 mm 141 mm
Technical Data
Power consumption approx. 1250 W (VA) approx. 1250 W (VA)
Dimensions (WxHxD) 630 x 468 x 415 mm 630 x 468 x 415 mm
Net weight approx. 80 kg approx. 72 kg
*depending on sample

NEW TECHNOLOGY FOR MAX. OPERATING CONVENIENCE
The mills offer a new and very convenient operator guidance system. All the relevant data can be entered or called up via the graphics display with single button operation.
  • Speed
  • Grinding time
  • Grinding direction reversal with input of running and interval times
  • Delayed start time
  • Remaining running time
  • Display of drive load factor
  • Operating hours
  • Error messages in clear text
  • Service intervals
10 combinations of speed, grinding time and interval settings can be stored for continually repeated
grinding processes. With multi-language menu options.

"COMFORT" GRINDING JARS

The performance and the results obtained are also determined by the choice of grinding jar and the balls with which it is filled. The selection depends on both the sample volume as well as the grind fineness that is to be achieved and the degree of purity required for the subsequent analysis. For coarse size reduction mainly large balls are used; a high degree of ultimate fineness requires the use of small balls. The higher the density of the ball material, the higher the pulverization energy.
As abrasion is frequently unavoidable during size reduction, the material for the beaker and balls should be selected so that there is no interference to the subsequent analysis. Grinding sets made from the high-performance ceramics sintered corundum and zirconium oxide with their high abrasion resistance offer a long working life combined with minimal abrasion.
Advantages
  • Unusually simple and safe handling
  • Safe, non-slip seating with builtin anti-rotation device and conical base centering
  • O-ring for gas-proof and dustproof seal
  • User-friendly gripping flanges on beaker and lid
  • Gap between jar and edge of lid for simple opening
  • Protective jacket of stainless steel for agate, sintered corundum,zirconium oxide and tungsten carbide grinding jars
  • Grinding jar identification (serial number, material and volume)
  • Labeling field (e.g. for sample)
The “Comfort” range of grinding jars has been specially developed for extreme working conditions such as long-term trials, high mechanical loads and maximum speeds; they are also suitable for mechanical alloying.
Materials
“Comfort” grinding jars are available in the following 6 materials:
  • Agate
  • Sintered corundum
  • Zirconium oxide
  • Stainless steel
  • Special steel
  • Tungsten carbide

GRIDING JAR FILLING
Guidelines for sample volumes and ball charges
 
Recommended ball charge
Nominal volume
Useful volume
(sample and balls)
PM100
PM200
Max. feed size
40 mm dia.
30 mm dia.
20 mm dia.
10 mm dia.
50ml
5-30ml
<3 mm
-
-
3
10
125ml
15-80ml
<4 mm
-
-
6
25
250ml
25-150ml
<6 mm
-
5
12
50
500ml
75-300ml
<10 mm
4
8
20
100

PLANETARY BALL MILL TECHNOLOGY
The grinding jar rotates about its own axis and, in the opposite direction, around the common axis of the sun wheel. The superimposition of the centrifugal forces produces grinding ball movements with a high pulverization energy. The centrifugal forces acting on the grinding jar wall initially carry the grinding balls in the direction in which the grinding jar is rotating. Differences occur between the speed of the grinding jar wall and the balls; this results in strong frictional forces acting on the sample.
As the rotational movement increases, Coriolis forces act on the balls to displace them from the grinding jar walls. The balls fly through the grinding jar interior and impact against the sample on the opposite grinding jar wall. This releases considerable dynamic impact energy. The combination of the frictional forces and impact forces causes the high degree of size reduction of planetary ball mills.

CAT. NO. DESCRIPTION
Planetary Ball Mills PM 100 (please order grinding jars and balls separately)
20.540.0001 For 230 V, 50/60 Hz with 1 grinding station set speed ratio 1 : -2
20.540.0003 For 120 V, 50/60 Hz with 1 grinding station set speed ratio 1 : -2
Planetary Ball Mills PM 200 (please order grinding jars and balls separately)
20.640.0001 For 230 V, 50/60 Hz with 2 grinding stations set speed ratio 1 : -2
20.640.0003 For 120 V, 50/60 Hz with 2 grinding stations set speed ratio 1 : -2

CAT. NO. DESCRIPTION
“Comfort” grinding jars
50 ml 125 ml 250 ml* 500 ml*  
01.462.0139 01.462.0136 01.462.0220 01 .462.0225 Agate
01.462.0153 01.462.0152 01.462.0221 01.462.0226 Sintered corundum
01.462.0188 01.462.0187 01.462.0219 01.462.0227 Zirconium oxide
01.462.0149 01.462.0148 01.462.0223 01.462.0228 Stainless steel
01.462.0145 01.462.0144 01.462.0224 01.462.0229 Special steel
01.462.0156 01.462.0155 01.462.0222 - Tungsten carbide
*not suitable for PM 200
Accessories and spare parts for “Comfort” grinding jars
Adapter for stacking 50 ml “Comfort” grinding jars*
03.025.0002 for 50 ml “Comfort” grinding jars made of stainless steel or special steel
03.025.0003 for 50 ml “Comfort” grinding jars made of agate, sintered corundum, zirconium oxide or tungsten carbide
Grinding jar lid for gassing
22.107.0005 for 250 ml “Comfort” grinding jars made of stainless steel
22.107.0006 for 250 ml “Comfort” grinding jars made of tungsten carbide
22.107.0007 for 500 ml “Comfort” grinding jars made of stainless steel
Safety closure device for “Comfort” grinding jars for filling and emptying processes under an inert atmosphere in a glovebox or for grinding with solvents
22.867.0002 for 50 ml “Comfort” grinding jars
22.867.0003 for 125 ml “Comfort” grinding jars
22.867.0004 for 250 ml “Comfort” grinding jars
22.867.0005 for 500 ml “Comfort” grinding jars
Spare parts for “Comfort” grinding jars
50 ml 125 ml 250 ml* 500 ml*
05.114.0057 05.114.0056 05.114.0055 05.114.0054 Spare O-ring, Viton
22.148.0002 22.148.0002 22.148.0001 22.148.0001 Spare labels, 25 pcs.
*not suitable for PM 200
Grinding balls
10 mm Ø 20 mm Ø 30 mm Ø 40 mm Ø
05.368.0067 05.368.0028 05.368.0065 05.368.0064 Agate, polished
05.368.0021 05.368.0054 05.368.0053 05.368.0052 Sintered corundum
05.368.0094 05.368.0093 05.368.0092 05.368.0091 Zirconium oxide
05.368.0063 05.368.0062 05.368.0061 05.368.0060 Stainless steel
05.368.0059 05.368.0033 05.368.0057 05.368.0056 Special steel
05.368.0071 05.368.0070 05.368.0069 05.368.0068 Tungsten carbide
Grinding balls for colloidal milling
2 mm Ø 3 mm Ø  
05.368.0089 05.368.0090 Zirconium oxide, yttrium-stabilized, container = 500 g