Mill-Pac Black

Mill-Pac Black at IGS Industries

Non-toxic and organically bound, IGS Industries’ Mill-Pac Black expands to form a tight seal in your fireplace or stove that will provide years of reliable service. Mill-Pac Black will not shrink or crack, and is inert to combustion byproducts. Several major wood, pellet, and gas stove appliance manufacturers specify Mill-Pac Black as their sealant of choice!

Mill-Pac Black is formulated using Non-RCF refractory fibers, which eliminates OSHA and EPA concerns with the use of these raw materials. Mill-Pac Black is still rated to a 1050°F (565oC) max continuous operating temperature, and has excellent resistance to erosion by gas or wood combustion byproducts. Since Mill-Pac Black has always been formulated with an organic, non-toxic binding system, it has been considered a green product. With the elimination of RCF fibers, Mill-PAC Black is truly environmentally friendly.

Typical Applications

  • Fireplaces

  • Wood, pellet, and gas stoves

  • Direct vent systems

  • Flue joints and boxes


  • Reduces sooting and whiting
  • Rated to 1,050°F
  • Does not bake onto equipment
  • Conforms to rough or misaligned components
  • Resists breakdown from acidic byproducts such as HCl, H2SO4, HNO3, NaNO2, and HF
  • Easy application and clean up
  • Mill-Pac Black is not classified as a hazardous material and is able to be shipped worldwide by any means
  • Mill-Pac Black is available through our Just-In-Time shipping program


mill-pac black

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