Fritsch Milling and Sizing

PULVERISETTE 7

Planetary Micro Mill Classic Line


Working principle impact force
Optimal for material type hard, medium-hard, brittle, moist
Number of working stations 2
Grinding tools grinding bowls and grinding balls
Materials of the grinding tools agate, sintered corundum, silicon nitride, zirconium oxide, hardened stainless steel, hardmetal tungsten carbide, polypropylene
Grinding bowl sizes 12, 45 ml
Grinding ball diameter 0.1 – 15 mm
Max. feed size (depends on material) 5 mm
Sample quantity 0.5-40 ml
Final fineness (depends on material) < 1 µm
Typical grinding time down to analytical fineness 3 min
Grinding process dry/wet
Grinding in inert gas only possible in glove box
Gas pressure and temperature measurement no
Rotational speed of main disk 100 – 800 rpm
Transmission ratio planetary disk / grinding bowl i relative = 1 : -2
Effective diameter of main disk 140 mm
Centrifugal acceleration (g = 9.81 m/s²) 50 g
Interfaces yes
Electrical details 100-120/200-240 V/1~, 50-60 Hz, 740 Watt voltage, indicated by customer is set
Emission sound pressure level at the workplace according to DIN EN ISO 3746 (depending on the material to be ground, grinding bowls/balls, selected rotational speed) up to approx. LpAd = 82 dB
Weight 35 kg
Dimensions (W x D x H) bench top instrument 37 x 53 x 50 cm


Recommended number of balls per grinding bowl
Grinding balls ≥ 5 mm Recommended number of balls per bowl
Grinding bowl/Useful capacity (grinding material) 12 ml
0.5 – 5 ml
45 ml
3 – 20 ml
Balls diameter
15 mm 7
10 mm 6 18
5 mm 50 180
Grinding balls ≤ 3 mm Recommended ball mass per bowl in grams
Grinding bowl / Useful capacity (grinding material) 12 ml
0.5 – 5 ml
45 ml
3 – 20 ml
Material
Zirconium oxide 20 g 70 g
Hardened, stainless steel 30 g 90 g
Hard metal tungsten carbide 50 g 200 g


Elemental Analysis
General specifications
Material Agate – SiO₂
Chemical composition
Element Share %
Silicon oxide – SiO₂ 99.9
Aluminium – Al₂O₃ < 0.02
Iron oxide – Fe₂O₃ < 0.02
Calcium oxide – CaO < 0.02
Magnesium oxide – MgO < 0.02
Sodium oxide – Na₂O < 0.02
Potassium oxide – K₂O < 0.02
Maganese oxide – MnO < 0.02
Physical and mechanical properties
Density 2.65 g/cm³
Hardness 6.5 – 7 Mohs
Elemental Analysis
General specifications
Material hardened stainless steel – 1.4125
ISO/EN/DIN code X105CrMo17
Chemical composition
Element Share %
Iron – Fe 81.4
Chronium – Cr 17
Carbon – C 1.1
Molybdenum – Mo 0.5
Physical and mechanical properties
Density 7.7 kg/dm³
Hardness ~ 60 HRC
Elemental Analysis
General Specifications
Material Sintered corundum 1 – Al₂O₃
ISO/EN/DIN code
Chemical composition
Element Share %
Aluminium oxide – Al₂O₃ 99.651
Silicon oxide – SiO₂ 0.257
Calcium oxide CaO 0.081
Other 0.011
Physical and mechanical Properties
Density 3.8 g/cm³
Hardness 18.00N/mm² (Vickers HV 0.5)
Elemental Analysis
General specifications
Material Zirconium oxide – ZrO₂
Chemical composition
Element Share %
Zirconium oxide – ZrO₂ 94.2 – 95.2
Hafnium oxide – HfO₂ 1 – 2
Magenesium oxide – MgO 3.5
Silicon dioxide – SiO2 0.1
Aluminum oxide – Al₂O₃ 0.1
Other 0.1
Physical and mechanical Properties
Density 5.7 g/cm³
Hardness Vickers 1200 (HV10)
Elemental Analysis
General specifications
Material Tungsten carbide – WC
ISO/EN/DIN code
Chemical composition
Element Share %
Tungsten carbide – TC 88
Cobalt – Co 12
Physical and mechanical properties
Density 14.3 g/cm³
Hardness 89.7 HRA
Elemental Analysis
General specifications
Material Silicon nitride – Si₃N₄
ISO/EN/DIN code SNCB5
Chemical composition
Element Share %
Al₂O₃Y₂O₃ 12.5
Si₃N₄ 86.5
Other 1
Physical and mechanical properties
Density 3.25 g/cm³
Hardness 91.1 HRA

USA Headquarters
FRITSCH Milling and Sizing, Inc.

57 Grant Drive, Suite G
Pittsboro, NC, 27312

Phone: + 1 919 229 0599
Email: info@fritsch-us.com

INSTRUMENT SUPPORT SERVICE

Our technical service team is at your disposal for maintenance, repair, calibration of laboratory instruments and ordering original spare parts. We are also available worldwide for warranty extensions and all other questions. Would you like to send your instrument for testing or maintenance to us? Please visit the Service Form page and complete the form for your submission. US Service Technician Reggie Piard 919-229-0599 x111