MFB-31 Proactive Liquid Fire Inhibitor
EPA Safer Choice Fire Retardant in 5-gallon pails, ready to use, for bare-bones framing.
The inhibitor itself. MFB-31 Proactive Liquid Fire Inhibitor, the only EPA Safer Choice fire inhibitor, shipped ready to use for crews spraying bare-bones framing. Same chemistry that goes on the mill-treated lumber, with the same test data behind it.

MFB-31 Proactive Liquid Fire Inhibitor is a ready-to-use, EPA Safer Choice certified fire inhibitor for bare wood, sprayed on the job site to reduce flame spread on exposed framing. It is the same chemistry applied at the mill to FireProShop Class A lumber, shipped in 5-gallon pails with the same test data behind it.
Questions about MFB-31 Proactive Liquid Fire Inhibitor.
- What is EPA Safer Choice, and why does it matter for a fire retardant?
- Safer Choice is the EPA program that certifies products whose ingredients meet its criteria for safer chemistry. MFB-31 is the only fire inhibitor carrying the certification, which matters to crews spraying it and to the people who live in the building afterward.
- Is MFB-31 ready to use?
- Yes. It ships in 5-gallon pails ready to spray, with no mixing. FireProShop sets the sprayer tips and pressure for it.
- How is MFB-31 related to the Class A lumber?
- It is the same chemistry. MFB-34 is applied at the mill to produce the stamped Class A lumber, and MFB-31 is the job-site version crews spray on bare framing, with the same test data behind it.
- Where is MFB-31 used?
- Exposed interior framing as the walls go vertical, and as the day-one fire chemistry in the Fence Defender treatment for cedar fences and under-decks.
Ask about MFB-31 Proactive Liquid Fire Inhibitor.
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