Burr grinders are more consistent than blade grinders. This is important when it comes to coffee extraction. Thus we can see there are generally two types – conical burr coffee grinders and flat burr coffee grinders on the market. Most home grinders use conical burrs since they are cost effective.
Product parameters
We manufacture coffee grinder burrs in 95%, 99% and 99.5% alumina. Alumina represents the most commonly utilized ceramic material in industry. Due to its extremely superior abrasion and chemical resistance, alumina has been widely used in makeing coffee grinder burrs.
Mechanical Property |
Ceramic Material |
99.5%
Al2O3 |
99%
Al2O3 |
95%
Al2O3 |
Density (g/cm3) |
≥3.90 |
≥3.85 |
≥3.65 |
Water absorption (%) |
0 |
0 |
0 |
Hardness (HV) |
1700 |
1700 |
1500 |
Flexural strength (Mpa) |
≥379 |
≥338 |
≥320 |
Compressive strength ( Mpa) |
≥2240 |
≥2240 |
≥2000 |
Fracture toughness (Mpam1/2) |
4-5 |
4-5 |
3-4 |