These boards are flammable but difficult to ignite. Fine airborne dust can ignite so avoid build-up of dust and keep all storage and work areas well ventilated. ... Dry dusts in high concentrations can be explosive.

Is Masonite fire resistant?

Ideal for entry ways, garages or multi-family homes, the Masonite fire-rated primed Prehung 6-Panel steel fire door provides incredible durability, protection and peace of mind.

Why is Masonite siding bad?

Swelling, buckling, and rotting are all really common issues with masonite siding. This is caused when moisture begins to infiltrate the siding. The wood chips and resin are not stable when they become wet. ... Over time, the wood then begins to rot, and the boards will begin to soften and decay.