ICS Industries Mill-Pac Black High-Temp Silicone Sealant (90 mL)

Trusted High-Temperature Sealing for Stoves, Fireplaces & Venting

Mill-Pac Black is a professional-grade, high-temperature silicone sealant engineered for fireplaces, stoves, and venting systems requiring long-lasting, flexible seals.

Key Features

• Rated for continuous use up to 1,050°F
• Non-toxic, environmentally friendly formulation
• Will not shrink, crack, or bake onto equipment
• Specified by major stove and fireplace manufacturers

Product Features

High-Temperature Performance for Hearth Applications

Mill-Pac Black high-temperature silicone sealant is designed specifically for wood stoves, pellet stoves, gas appliances, and fireplace venting systems, maintaining a durable seal under extreme heat.

Non-Toxic, Environmentally Responsible Formula

Formulated with Non-RCF refractory fibers, this sealant eliminates OSHA and EPA concerns associated with traditional refractory materials while remaining fully rated for high-heat operation.

Flexible Seal That Won’t Crack or Shrink

Unlike conventional sealants, Mill-Pac Black expands slightly to form a tight seal, conforming to rough or misaligned components without cracking over time.

Resistant to Combustion Byproducts

This high-temp stove sealant resists degradation from acidic combustion byproducts such as:

• Hydrochloric acid (HCl)
• Sulfuric acid (H₂SO₄)
• Nitric acid (HNO₃)
• Sodium nitrite (NaNO₂)
• Hydrofluoric acid (HF)

Ideal for Professional & DIY Installations

Mill-Pac Black applies easily, cleans up efficiently, and does not bake onto equipment, making it a preferred sealant for installers and homeowners alike.

Typical Applications

• Fireplaces
• Wood-burning stoves
• Pellet stoves
• Gas stoves
• Direct vent systems
• Flue joints and vent boxes

Product Specifications