Hot spots, also called surface defects, are a common quality issue in tempered glass production. Hot spots on tempered glass generally fall into two categories: dispersed spots and dense spots. Understanding their causes and implementing preventive measures is essential for maintaining high production standards.

Dispersed hot spots appear as scattered, star-like marks across the glass surface. These are typically caused by dirty ceramic rollers, which accumulate debris over time, or residual glass cullet left on the rollers after glass breakage. Regular cleaning and maintenance of the rollers can effectively reduce the occurrence of dispersed hot spots.

Dense hot spots, on the other hand, form a clustered pattern resembling an orange peel texture. These are usually the result of excessive heating or prolonged exposure to high temperatures in the furnace. To address this issue, manufacturers need to carefully adjust the heating parameters, including temperature and heating time, to avoid overheating. By optimizing these settings and adhering to proper maintenance routines, manufacturers can significantly improve the quality of tempered glass while minimizing surface defects.