Red High Temp RTV Silicone Sealant Thermo – Non-Sag -80°F–500°F 3-Tube

Description

Product Overview

The Red High-Temp RTV Silicone Sealant is engineered for demanding industrial environments where temperature extremes and reliable sealing are non‑negotiable. Formulated by Thermo Mfg, this sealant combines a high‑performance silicone base with a proprietary non‑sag additive that prevents runoff on vertical or overhead surfaces. The result is a smooth, uniform bead that adheres firmly to metal, ceramic, glass, and many polymer substrates. With a temperature rating from –80°F to 500°F, the material maintains its elasticity and sealing integrity even after repeated thermal cycling, making it suitable for both cryogenic and high‑heat applications.

Each package contains three 3‑tube cartridges, each measuring 13 × 6 × 6 inches and weighing approximately one pound. The compact packaging is designed for easy storage, quick access, and efficient dispensing using standard caulking guns. The sealant is also electrically insulating, providing an added safety layer for wiring and electronic components that may be exposed to heat or moisture.

Usage

Thermo’s Red High-Temp RTV Silicone Sealant excels in a wide range of HVAC, furnace, and industrial oven applications. Installers use it to seal furnace vent pipes, ensuring no combustion gases escape the system while protecting surrounding structures from heat damage. In commercial kitchens, the sealant is applied around heating elements and oven doors to prevent heat loss and improve energy efficiency. Fireplaces and wood‑burning stoves benefit from its ability to withstand direct flame exposure without degrading, providing a long‑lasting barrier against smoke and heat.

Beyond heating systems, the sealant is ideal for sealing smoke stacks, exhaust ducts, and engine components where high temperatures and vibration are common. Its non‑sag property allows technicians to apply the material on vertical exhaust flues without the risk of sagging or dripping, ensuring a clean, professional finish. The electrically insulating nature also makes it a preferred choice for sealing around high‑voltage wiring in industrial machinery, reducing the risk of short circuits caused by moisture ingress.

For field service technicians, the three‑tube pack offers flexibility: one tube can be reserved for future maintenance, while the remaining two are used for immediate repairs. The sealant cures at room temperature, eliminating the need for heat‑curing ovens or specialized equipment, which speeds up turnaround times on site.

Why Choose Us

Thermo Mfg has a legacy of producing high‑quality industrial sealants that meet rigorous ASTM and ISO standards. Each batch of Red High-Temp RTV Silicone Sealant undergoes comprehensive testing for temperature resistance, tensile strength, and electrical insulation performance. This quality assurance process guarantees that the sealant will perform reliably in the most demanding environments, from aerospace ground support equipment to heavy‑duty manufacturing plants.

Our non‑sag formulation is the result of years of research into polymer chemistry, delivering a product that stays in place on vertical surfaces without compromising flexibility. The sealant also features low VOC emissions, aligning with environmental regulations and workplace safety guidelines. Customers benefit from a product that not only meets technical specifications but also supports sustainability initiatives.

Thermo provides dedicated technical support for all its sealant products. Whether you need guidance on surface preparation, application techniques, or curing times, our engineers are available to answer questions and troubleshoot issues. In addition, we offer a comprehensive warranty that covers material defects, giving users confidence in the long‑term durability of their purchase.

Key Features

• Wide temperature range (–80°F to 500°F) ensures performance in extreme conditions.
• Non‑sag formula provides a clean, uniform seal on vertical and overhead surfaces.
• Electrical insulation protects wiring and components from moisture and heat.
• Three‑tube pack offers flexibility for multiple projects and long‑term storage.
• Thermo technical support and warranty provide peace of mind after purchase.

FAQ

What surfaces can the sealant adhere to?

The sealant bonds well to metal, glass, ceramic, and most plastics. For optimal adhesion, clean the surface of dust, oil, and loose particles before application.

How long does it take to cure?

Full cure is typically achieved within 24 hours at room temperature (70°F). The sealant becomes tack‑free in about 30 minutes, allowing handling of the sealed joint after that period.

Is the sealant safe for food‑contact environments?

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While the sealant is non‑toxic once cured, it is not certified for direct food contact. Use it in areas where the sealant does not come into direct contact with food, such as oven interiors or external heating elements.

Can the sealant be painted after curing?

Yes, once fully cured the sealant can be painted with most oil‑based or latex paints. This allows you to match the sealant color to surrounding components for a seamless appearance.

What is the recommended storage condition?

Store the unopened tubes in a cool, dry place away from direct sunlight. The sealant remains stable for up to two years when stored under these conditions.