PriorFire Formula 51

HeatShield SKU: 300668
PriorFire Formula 51

PriorFire Formula 51

HeatShield SKU: 300668
Regular price $127.14
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HeatShield PriorFire Formula 51 an be parged, troweled or hand packed over any brick, block or stone surface exposed to high temperatures such as smoke chambers, ash pits, vent connections and more. Formula 51 meets and or exceeds all of the national and local building codes for new construction and repairs of masonry fireplaces and chimneys. Not suitable for food storage or food preparation areas. Meets ASTM C-199 (Medium Duty), and is non-water soluble when dry.

  • Listed to UL 2505
  • Insulates Fireplace Smoke Chambers for Added Safety
  • Smoothes Jagged Edges, Corbels and Reshapes Smoke Chambers for Increased Performance
  • Insulates from Heat or Cold
  • Resists Temperatures Up To 2550° F
  • Sticks to Most Anything
  • Repairs Any Brick Block or Stone Exposed to High Temperatures

WARNING: This product can expose you to chemicals including quartz and titanium dioxide, which are known to the State of California to cause cancer. For more information, go to

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