... melting point 80.1, boilingpoint 217.9, flash point 78.89, spontaneous combustion point 526, explosion limit; Dust floor 2.5 ... 1, boiling point is 217.9,flashing point is 78.89, and spontaneous ignition point is 526.Explosion limit: Dustlower ... )invalatile substance:≤ 0.04 (excellent grade), ≤ 0.06 (first level),≤ 0.08 (qualified level)ash:≤ 0.01(excellent grade),≤0.01(first level),≤0.02(qualified level ...