Hi-Temp Silicone Sealant
For Woodstoves & Inserts & Fireplaces & Alternative Fuels
🔧 Hi-Temp Silicone Sealant – For Pellet Stove Flues & Gas Vent Pipes
Flexible, weather-resistant sealant for high-temperature applications.
This ready-to-use silicone sealant is ideal for sealing pellet stove flues and gas appliance vent pipes, forming a flexible, waterproof bond that withstands elevated temperatures and outdoor exposure.
🔥 Product Features:
- Black and Clear formulas withstand:
- 450°F continuous
- 500°F intermittent
- Hi-Temp Red formula withstands:
- 550°F continuous
- 600°F intermittent
- 24-hour cure time at temperatures above 60°F
- Suitable for outdoor use – resists weathering and moisture
- Forms a flexible, rubber-like seal that won’t crack or shrink
- Adheres to metal, glass, plastic, fiberglass, wood, brick, and slate
Perfect for vent pipe joints, flue collars, and other high-heat sealing needs in both indoor and outdoor installations.
Part #:
- Choose one
Part #:
- Choose one
Part #:
600B - 2.8 oz tube (Black Acetoxy Cure)
Part #:
600c - 2.8 oz tube (Clear Acetoxy Cure)
Part #:
600R - 2.8 oz tube (Red Acetoxy Cure)
Part #:
601C - 10.3 oz Cartridge (Clear Acetoxy Cure)
Part #:
601B - 10.3 oz Cartridge (Black Acetoxy Cure)
Part #:
613 - 10.3 oz Cartridge (Red Acetoxy Cure)
Description
How to Use
Additional Info
Available Sizes and Colors
| Size | Color | Item No. | Packaging | |
|---|---|---|---|---|
| 2.8 oz Tube | Black | 600B | Tube | |
| Clear | 600C | Tube | ||
| Red | 600R | Tube | ||
| 10.3 oz Cartridge | Black | 601B | Cartridge | |
| Clear | 601C | Cartridge | ||
| Red | 613 | Cartridge |
How to Use
- Prepare the Area
- Work in a well‑ventilated area.
- Ensure the surface is clean, dry, and free of frost (especially in cold weather).
- Do not use soap for cleaning—silicone will not adhere to soap or detergent residue.
- Surface Preparation for Porous Materials
- Use sandpaper or a wire brush to remove loose particles, dust, and contamination before applying the silicone.
- Application
- Apply the silicone evenly to the prepared surface.
- Smooth or shape the bead as needed within the first 5 minutes, before it begins to form a skin.
- Curing and Drying Time
- Skins over: approximately 5 minutes
- Dry to the touch: around 1 hour
- Fully cured/bonded: 24 hours
- Maximum strength: achieved after up to 7 days depending on temperature and humidity.
Tips
- Ideal curing temperature: 75°F — allow 24 hours for full cure.
- This is an RTV (Room Temperature Vulcanization) product, meaning it begins curing when exposed to air (minimum 50°F) — more specifically, due to moisture in the air.
- Expect off-gassing during this process; it’s normal!
- Remove any old silicone before applying new sealant — fresh silicone bonds much better to a clean surface than to old sealant residue.
Additional Information
- ❌ Not NSF Certified — not recommended for food contact applications.
- ❌ Not paintable — latex paint adheres only to paintable sealants, not silicone.
- ✅ Safe for use on glass (ensure it’s clean before application).
- ✅ Safe on copper — provides a flexible, less permanent bond compared to Furnace Cement or Fireplace Mortar.
- 🌧️ Outdoor use: suitable once fully cured; becomes water‑resistant afterward.
- 🔥 Red silicone contains red oxide in its formula, which allows for a higher temperature rating.
Black
Clear
Red
Black
Black
Red