It uses the patented fireproof substrate supported and protected by aluminum film in the back. Its stronger fire resistance than ordinary crystalline silicon modules meet the Class C fire rating:

Fuel block test: 20 fuel blocks, burning for 90 minutes, without burn-through;

Flame spread test: Flame temperature 704±28°C, air velocity 5.2-5.3 m/s, no combustibles drop after burning for 4 minutes.