How to Reduce Cracks in Clay Bricks During Sun Drying

Sun drying in open brick yards is one of the most weather-sensitive steps in red brick manufacturing. In dry windy months, drying crack losses can reach 15% to 25% of molded stock if precautions are not taken.

1. Why Drying Cracks Form

Sun and wind strike the exposed upper face of molded bricks, causing water on that surface to vaporize rapidly while the underside remains cool and damp. The upper surface shrinks quickly, but the wet core resists shrinkage. This tension difference tears the surface, creating cracks.

2. Step-by-Step Practical Mitigation

1. Protect Fresh Bricks from Direct Noon Wind: Use shade netting or straw coverings during the initial 24–48 hours of drying.
2. Timely Edge-Turning: Turn bricks on edge as soon as initial firmness allows, exposing all six faces to uniform air circulation.
3. Incorporate Safe Burn Chemicals 27 KG: By conditioning clay platelets, Safeburn supports uniform internal water transmission, tempering differential shrinkage stresses.