Burning Performance

Burns at least 90–120 minutes
Produces steady, consistent heat
Easy to light (5–10 minutes with proper burner)

Smoke & Odor

No chemical or unpleasant odor during ignition
Very little to no smoke once fully lit

Ash Quality

Ash content less than 3%
Ash color: light gray or white 
Ash is fine and light, not heavy

Physical Strength

Briquette feels hard and dense
Does not break easily when pressed by hand
Survives a drop test (1 meter) without crumbling

Moisture & Density

Briquette sinks immediately when placed in water
Surface is smooth, no cracks or excess powder