Bitumen and Tar Coatings

Bitumen-tar contamination forms sticky organic residue on surfaces during industrial exposure and road contact. Layer adheres strongly because it penetrates pores and creates uneven buildup. After deposition, surface exhibits dark, viscous coating that resists initial cleaning. In laser applications, removal challenges arise so thermal expansion causes cracking but re-adhesion occurs. Material behaviors differ: on metals, tar carbonizes easily and produces smoke, while on stone, bitumen softens slowly without deep penetration. Process demands pulsed lasers to avoid substrate damage. Results show effective ablation on flat areas, yet crevices trap residue for prolonged treatment. During observations, uniformity improves after multiple passes.