Main classes
2X
Divisions
Sections
- 660Chemical engineering
- 661Industrial chemicals
- 662Explosives, fuels & related products
- 663Beverage technology
- 664Food technology
- 665Industrial oils, fats, waxes & gases
- 666Ceramic & allied technologies
- 667Cleaning, color & coating technologies
- 668Technology of other organic products
- 669Metallurgy