Ember Guard | Class A Fire Retardant

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Ember Guard is a clear, non-toxic, water-based fire retardant designed for untreated wood surfaces. Independently tested to ASTM E84 standards by QAI Laboratories, it achieves a Cl ass A fire rating with a Flame Spread Index (FSI) of ≤25 and a Smoke Developed Index (SDI) of 0—a performance level typically reserved for non-combustible materials. The formula penetrates deeply into the wood’s cellular structure, forming a durable internal barrier that significantly reduces flame spread and may prevent smoke generation. In addition to fire resistance, Ember Guard enhances the wood’s dimensional stability—helping to prevent swelling, shrinking, and moisture intrusion, and can deter wood boring pests. FEATURES • Class A Fire Retardant (ASTM E84) (FSI ≤ 25) • Zero Smoke Developed Index (SDI = 0) • Clear & colorless • Structural stabilization & internal moisture control • Non-toxic, water-cleanup, and zero VOC • Permanent internal treatment — no reapplication needed in most circumstances • Compatible with both interior and exterior applications • Easy spray or brush application • Compatible with LS PRO, LSS, DF stains for exterior/interior and Crystal Urethane for interior Show more