Type of material Material example Max. angle of inclination Height of cleats H(mm): 14 H(mm): 16 H(mm): 25 H(mm): 32 Powdery Flour, etc. 25° 25° 28° 30° Loose flowing Corn, barley, wheat, rye, etc. 20/25° 20/25° 25/30° 25/30° Loose rolling Gravel, ground stone, etc. 25° 25° 28° 30° Sticky Wet sand, ash, wet loam, etc. 30° 30/35° 35/40° 40/45° Packed Sacks, paper sacks, etc. 30/35° 30/35° 35/40° 35/40°