Grinding balls 30 mm dia. for grinding bowls 500 ml, 250 ml stainless steel_1154994
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Grinding balls 30 mm dia. for grinding bowls 500 ml, 250 ml stainless steel

Density7.7 g/cm³
Element: Carbon – CShare %: 0.43 – 0.50
Element: Chromium – CrShare %: 12.5 – 14.5
Element: Iron – FeShare %: approx. 84
Element: Manganese – MnShare %: ≤ 1.00
Element: Phosphorus – PShare %: ≤ 0.040
Element: Silicon – SiShare %: ≤ 1.00
Element: Sulphur – SShare %: ≤ 0.015
HardnessBall diameter ≤ 12.7 mm 580 – 700; HV10 Ball diameter > 12.7 – 50.8 mm 54 – 60 HRA
ISO/EN/DIN CodeX47Cr14, B50
MaterialStainless steel – 1.3541
Explanations on hardness data
Overview

Please note: For the Planetary Mono Mill PULVERISETTE 6 classic line, you require at least 1 grinding bowl of your choice and the corresponding number of grinding balls. The grinding bowl material must also be harder than the material to be ground. In normal cases, grinding bowls and balls of the same material are used. To shorten the grinding time, grinding bowls and balls with a higher density and correspondingly higher impact energy can be used. Please take note of the useful capacity, this is not identical with the bowl volume!

For the Planetary Mill PULVERISETTE 6 premium line / Planetary Mill PULVERISETTE 5/2 classic line / Vario-Planetary Mill PULVERISETTE 4 classic line, you require at least 2 grinding bowls of your choice and the corresponding number of grinding balls. The grinding bowl material must also be harder than the material to be ground. In normal cases, grinding bowls and balls of the same material are used. To shorten the grinding time, grinding bowls and balls with a higher density and correspondingly higher impact energy can be used. Please take note of the useful capacity, this is not identical with the bowl volume!

For the Planetary Mill PULVERISETTE 5/4 classic line, you require at least 4 grinding bowls of your choice and the corresponding number of grinding balls. The grinding bowl material must also be harder than the material to be ground. In normal cases, grinding bowls and balls of the same material are used. To shorten the grinding time, larger or heavier grinding bowls and grinding balls with a higher density and correspondingly higher impact energy can be used. Please take note of the useful capacity, this is not identical with the bowl volume!

 

For achieving best grinding results grinding balls are available in 0.1 - 40 mm diameters and in 7 different materials, thus directly preventing contamination of the samples as a result of undesired abrasion. The recommended number of balls per grinding bowl can be found in the selection aid.

 

General material specification:
Material: stainless steel - 1.3541
Abrasion resistance: fairly good
Suitable for: medium-hard, brittle samples

Planetary Mono Mill PULVERISETTE 6 classic line / Planetary Mill PULVERISETTE 5/4 classic line / Planetary Mill PULVERISETTE 5/2 classic line / Vario-Planetary Mill PULVERISETTE 4 classic line

(Selection Aid)

 

MATERIAL DATA FOR GRINDING BOWLS / BALLS

Material Main component of the material Density g/cm³ Abrasion resistance Used for grinding material
Agate SiO2 2.65 good soft to medium-hard samples
Sintered corundum Al2O3 (99.7%) 3.8 moderately good medium-hard, fibrous samples
Silicon nitride Si3N4 3.25 extremely good abrasive samples, metal-free grinding
Zirconium oxide ZrO2 5.7 very good fibrous, abrasive samples
Stainless steel Fe – Cr – Ni 7.8 moderately good medium-hard, brittle samples
Tempered steel Fe – Cr 7.9 good hard, brittle samples
Hardmetal tungsten carbide WC 14.95 very good hard, abrasive samples

 

 RECOMMENDED NUMBER OF BALLS PER GRINDING BOWL

Grinding balls ≥ 5mm
Recommended number of balls per bowl

Grinding bowl/
Useful capacity (grinding material)
80 ml
10 – 30 ml
250 ml
30 – 125 ml
500 ml
80 – 225 ml
Balls diameter      
40 mm     4
30 mm   6 8
20 mm 5 15 25
15 mm 10 45 70
10 mm 25 50 100
5 mm 250 1200 2000

 

Grinding balls ≤ 3 mm
Recommended ball mass per grinding bowl in grams

Grinding bowl/
Useful capacity (grinding material )
80 ml
10 – 30 ml
250 ml
30 – 125 ml
500 ml
180 – 225 ml
Material      
Zirconium oxide 100 g 400 g 800 g
Stainless Steel / hardened steel 150 g 500 g 1100 g
Hardmetal tungsten carbide 300 g 1000 g 2100 g

 

ADDITIONAL INFORMATION

Grinding balls with diameter 3 mm and smaller must be weighed out. The above table provides you with the necessary weight to be included per grinding bowl.

The quantity of grinding balls can be reduced by up to 15%; however, increased wear should be expected in this case. The specified number/mass of balls per bowl is the minimum quantity; depending on the material behaviour, it may be necessary to increase this.

In normal cases, grinding bowls and balls of the same material are used. To shorten the grinding time, grinding bowls and balls with a higher density and correspondingly higher impact energy can be used.

 

Planetary Mill PULVERISETTE 6 premium line

(Selection Aid)

 

MATERIAL DATA FOR GRINDING BOWLS / BALLS

Material Main component of the material Density g/cm³ Abrasion resistance Used for grinding material
Agate SiO2 2.65 good soft to medium-hard samples
Sintered corundum Al2O3 (99.7%) 3.8 moderately good medium-hard, fibrous samples
Silicon nitride Si3N4 3.25 extremely good abrasive samples, metal-free grinding
Zirconium oxide ZrO2 5.7 very good fibrous, abrasive samples
Stainless steel Fe – Cr – Ni 7.8 moderately good medium-hard, brittle samples
Tempered steel Fe – Cr 7.9 good hard, brittle samples
Hardmetal tungsten carbide WC 14.95 very good hard, abrasive samples

 

 RECOMMENDED NUMBER OF BALLS PER GRINDING BOWL

Grinding balls ≥ 5mm
Recommended number of balls per bowl

Grinding bowl/
Useful capacity (grinding material)
160 ml
20 – 70 ml
250 ml
30 – 125 ml
500 ml
80 – 225 ml
Balls diameter      
40 mm     4
30 mm   6 8
20 mm 10 15 25
15 mm 30 45 70
10 mm 35 50 100
5 mm 350 1200 2000


Grinding balls ≤ 3 mm

Recommended ball mass per grinding bowl in grams

Grinding bowl/
Useful capacity (grinding material )
160 ml
20 – 70 ml
250 ml
30 – 125 ml
500 ml
80 – 225 ml
Material      
Zirconium oxide 250 g 400 g 800 g
Stainless Steel / hardened steel 350 g 500 g 1100 g
Hardmetal tungsten carbide 650 g 1000 g 2100 g


ADDITIONAL INFORMATION

Grinding balls with a diameter of 3 mm and less must be weighed out. The respective table for the PULVERISETTE 6 premium line provide you with the required mass per grinding bowl.
The specified ball fi lling per bowl is the minimum quantity and should possibly be increased depending on the material properties. In exceptional cases, the number of grinding balls can be reduced by up to 15 %. However, increased abrasion should be expected.
In normal cases, grinding bowls and balls of the same material are used. To shorten the grinding time, grinding bowls and balls with a higher density and correspondingly higher impact energy can be used.

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