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Non-Toxic High Temp Mill-Pac Black Sealant | Fireplaces, Wood, Pellet, and Gas Stoves, Direct Vent Systems, Flue Joints | Environmentally Friendly | 1050-Degree (10.3 oz Cartridge)

4.3 4.3 out of 5 stars 163 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Fireplace Chimney Caps by IGS Industries

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10.3 oz Cartridge

Purchase options and add-ons

Material Silicone
Brand IGS Industries
Style Compact
Item Weight 10.3 Ounces
Compatible Material Wood

About this item

  • NON TOXIC & ORGANICALLY BOUND - Formulated with an organic, non-toxic binding system. With the elimination of RCF fibers, Mill-PAC Black is truly environmentally friendly.
  • HIGH PERFORMANCE SEALANT - Expands to form a tight seal in your fireplace or stove that will provide years of reliable service.
  • BEST FOR GAS APPLIANCES - Mill-Pac will not off-gas like RTV red silicone making it an ideal sealer for direct vent pipe on units with electronic ignition.
  • 1050°F HIGH TEMPERATURE - Rated to a 1050°F (565°C) max continuous operating temperature.
  • EASY TO USE - Easy application and clean up. Reduces sooting and whiting. Does not bake onto equipment. Conforms to rough or misaligned components.
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Technical Details

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Non-Toxic

Non-Toxic High Temp Mill-Pac Black Sealant | Fireplaces, Wood, Pellet, and Gas Stoves, Direct Vent Systems, Flue Joints | Environmentally Friendly | 1050-Degree (10.3 oz Cartridge)


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Product Description

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

Advantages:
- 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

Customer reviews

4.3 out of 5 stars
4.3 out of 5
163 global ratings

Customers say

Customers like the quality of the sealant, saying it works well and takes the heat. However, some customers have reported that the product smokes horribly and stinks like you have burned grease. Opinions are mixed on the ease of application.

AI-generated from the text of customer reviews

11 customers mention11 positive0 negative

Customers are satisfied with the quality of the sealant. They mention that it works well and takes the heat.

"Easy to use , and very effective. Easy clean up" Read more

"Great stuff and works great too." Read more

"...It seemed to work good. I think others are waiting too long to heat cure it causing the solvents needed for the curing process to evaporate." Read more

"I bought this for my husband and he loves it. He says it works great." Read more

11 customers mention5 positive6 negative

Customers are mixed about the ease of application of the sealant. Some mention it's easy to apply and work with, while others say it'll be hard to apply.

"Easy to use , and very effective. Easy clean up" Read more

"no instructions were sent with the sealer - having used such a product before i knew to heat cure before having a hot fire...." Read more

"Went on easily enough, let it cure for four days over Christmas, then when I fired the stove up it finished curing by SMOKING LIKE CRAZY!!..." Read more

"...For starters there are no directions of any kind on how to apply it. I even went to their website but there's nothing there in the product sheet...." Read more

5 customers mention0 positive5 negative

Customers are dissatisfied with the smoke produced by the sealant. They mention that it smokes horribly and stinks like you have burned grease. Some customers also say that the sealer starts to smoke at low temperature.

"...I had all windows open, the smell was horrible and after 3 days of doing that it never got any better...." Read more

"...and immediately realized that was the wrong thing as the sealant started to smoke and fill our house with smoke...." Read more

"BAD PRODUCT. It began to smoke at low temperature" Read more

"This stuff stinks and smokes like crazy—be ready!!..." Read more

Great for removal high heat applications
5 Stars
Great for removal high heat applications
I use for seal on wood pellet stove combustion blowers motor flange to housing. For easy removal for next service. 34 years of experienceMuch better and value than fiber gaskets that need to be replaced.
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Top reviews from the United States

Reviewed in the United States on December 3, 2022
Size: 10.3 oz CartridgeVerified Purchase
2 people found this helpful
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Reviewed in the United States on December 28, 2023
Size: 10.3 oz CartridgeVerified Purchase
Reviewed in the United States on December 29, 2023
Size: 10.3 oz CartridgeVerified Purchase
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5.0 out of 5 stars Great for removal high heat applications
Reviewed in the United States on December 29, 2023
I use for seal on wood pellet stove combustion blowers motor flange to housing. For easy removal for next service. 34 years of experience
Much better and value than fiber gaskets that need to be replaced.
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Customer image
Customer image
Reviewed in the United States on May 15, 2023
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Reviewed in the United States on November 10, 2023
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Reviewed in the United States on December 24, 2019
Size: 10.3 oz CartridgeVerified Purchase
19 people found this helpful
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Reviewed in the United States on April 12, 2023
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3 people found this helpful
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Reviewed in the United States on March 30, 2020
Size: 10.3 oz CartridgeVerified Purchase
5 people found this helpful
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