Abrasives Grit Grains Compounds Aluminium Oxide Silicon Carbide Zirconia Sol-Gel

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Chesterfield Trading Estate
Chesterfield
S41 9QJ
United Kingdom
Tel: +44 (0)1246 572230
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web: www.jowitt.com
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Grits and Grains

The abrasive grains in a grinding wheel are its cutting points. These grains come in many materials, shapes and sizes.

Most grains come in a variety of shapes which govern their specific gravity and their cutting performance.

Typical types of grit:

Aluminium Oxide

Regular Brown:
- Tough form of aluminium oxide.
- 96% pure. Hardness around 18.5 GPa.
- Toughness imparted by metal oxides.
- For grinding high tensile strength materials, as well as rough grinding, deburring, snagging, cutting and fettling of low-alloy, ferrous materials.
White:
- High friability.
- 99% pure. Hardness around 19.5 GPa.
- Friability imparts high speed and cool cutting grinding characteristics, making it suitable for grinding hardened and high alloy steels up to 62 Rc.
Pink:
- Slightly less friable than white but a little tougher
- pink in colour due to the addition of metal oxides.
- 99% pure. Hardness around 19.0 GPa Knoop.
- Can be used in similar applications to WA and in particular highly alloyed tool steels

Silicon Carbide

Black:
- Harder than aluminium oxide at 24 GPa but more brittle.
- Used when grinding low tensile materials like cast iron, non-ferrous and non-metallic.
Green:
- preferred by carbide tool grinders.

Zirconia

Zirconia complex.
16 GPa.
A tough abrasive which has good thermal stability at grinding temperatures.
Tends to be used in steel mills and foundries.

Sol-Gel

A unique microstructure imparts good durability and high stock-removal rates.
The combination of hardness and toughness endows this type of grain with the ability to cut both ferrous and non-ferrous materials.

The Jowitt website features our wide range of grinding services including rail track grinding and manufacturers of grinding discs, grinding segments, and resin bonded grinding wheels for surface grinding. Products available include grinding discs, cylinder wheels, grinding segments, centreless peripheral wheels and grinding compounds. We also supply specialised CBN and diamond products in resin, metal or vitrified bonds

Resin Bonded Grinding Wheels - Grinding Wheels Segments - Bonded Grinding Wheels - Fettling Wheels - Roll Grinding Wheels - Inserted Nut Cones and Plugs - Abrasive Wheel Manufacturers - Peripheral Wheels - Surface Grinding Wheels - Abrasive Compounds