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What Makes RTV Sealant The Go-To Solution For Industrial Sealing?

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In the realm of industrial sealing, one solution stands out as the go-to choice for professionals: RTV sealant. RTV, which stands for Room-Temperature Vulcanizing, refers to a versatile type of adhesive sealant that cures and forms a durable, flexible seal at ambient temperatures.

Its unique properties and exceptional performance make it an indispensable tool in various industrial applications.

In this blog, we will delve into the characteristics that set RTV sealant apart from other types of sealants, explore its benefits, discuss the factors influencing its cure at room temperature, and ultimately understand why RTV adhesive is the preferred solution for industrial sealing needs.

Understanding RTV Sealant:

Before delving into the advantages of RTV sealant, it's crucial to understand its composition and characteristics. RTV sealant is a silicone-based adhesive that is available in both one-part and two-part formulations.

1) Two-part RTV adhesive:

Two-part RTV adhesive refers to a formulation that requires mixing two components, typically a base and a curing agent, before application. This type of RTV adhesive offers certain advantages in specific applications but also has some drawbacks compared to one-part formulations.

The mixing process adds complexity and requires careful measurement to ensure the correct ratio. Additionally, it has a limited working time or pot life, meaning the adhesive must be applied within a specific time frame before it starts to cure. These factors can affect efficiency, especially in large-scale or time-sensitive projects.

2) One-part RTV adhesive:

One-part RTV adhesive, exemplified by DOWSIL™ 732 Multi-Purpose Sealant, is a silicone-based sealant that offers convenience, versatility, and excellent sealing properties.

  • As a single-component formulation, it does not require mixing, simplifying the application process and reducing the potential for errors.
  • DOWSIL™ 732 Multi-Purpose Sealant, provided by Joinstar, is available in various colors, including clear, white, black, aluminum, and gray, allowing for aesthetic compatibility with different substrates.
  • Its silicone-based composition enables it to cure by reacting with moisture in the air, forming a flexible and durable seal. The sealant offers a relatively quick skin-over time of 10-20 minutes at room temperature and 50% relative humidity while achieving a depth of 3 mm cure in 24 hours.

RTV sealant

Distinguishing features of RTV sealant:

One of the most distinguishing features of RTV adhesive is its ability to cure at room temperature. Unlike other sealants that require heat or ultraviolet (UV) light for the curing process, RTV sealant undergoes a chemical reaction with moisture in the air to solidify.

This ambient temperature curing process offers significant advantages, such as ease of application, reduced energy consumption, and compatibility with a wide range of materials.

The Benefits Of RTV Sealant:

RTV sealant offers numerous benefits that make it an ideal choice for industrial sealing applications. Let's explore some of these advantages:


RTV sealant exhibits excellent adhesion to various substrates, including metals, glass, ceramics, plastics, and rubber. Its versatility enables it to address a wide range of sealing requirements across different industries.

Weather Resistance:

RTV sealant forms a resilient seal that can withstand extreme temperature variations, UV exposure, moisture, and harsh environmental conditions. This durability ensures long-term protection and enhances the lifespan of sealed components.

Chemical Resistance:

RTV sealant demonstrates exceptional resistance to chemicals, including oils, fuels, solvents, and acids. This attribute makes it an invaluable asset in industries where exposure to aggressive substances is common.


The cured RTV adhesive maintains its flexibility even after solidification, allowing it to accommodate movement and vibration without compromising the seal. This flexibility helps prevent leaks and enhances the overall performance of sealed assemblies.

Factors Influencing RTV Sealant Cure At Room Temperature:

The curing process of RTV adhesive is influenced by several factors that are important to consider for optimal performance:

  •  Humidity:

The presence of moisture in the air is crucial for RTV sealant to cure effectively. Higher humidity levels accelerate the curing process, while low humidity can result in slower or incomplete curing. Maintaining the recommended humidity range ensures consistent and reliable seal formation.

RTV sealant

  • Thickness:

The thickness of the RTV adhesive layer affects the curing time. Thicker layers require more time to cure completely, as the ambient moisture needs to penetrate through the entire thickness. It is important to follow the manufacturer's guidelines regarding the recommended thickness for optimal curing results.

  •  Temperature:

Although RTV sealant cures at room temperature, temperature variations can affect the curing time. Higher temperatures accelerate the curing process, while lower temperatures prolong it. It is advisable to store and apply RTV sealant within the recommended temperature range to ensure consistent and predictable results.

Why RTV Sealant Is The Preferred Solution For Industrial Sealing?

Considering the unique characteristics and benefits of RTV sealant, it becomes evident why it is the preferred solution for industrial sealing needs:

Efficient Application:

The ability of RTV adhesive to cure at room temperature simplifies the application process, eliminating the need for specialized equipment or energy-intensive curing methods. This ease of use allows for faster and more efficient sealing operations, saving both time and resources.

Reliability and Longevity:

The excellent adhesion, weather resistance, and chemical resistance properties of RTV sealant ensure reliable and long-lasting seals. This reliability is crucial in industrial environments where the integrity of seals directly impacts safety, performance, and operational efficiency.


RTV sealant exhibits compatibility with a wide range of substrates, making it suitable for diverse sealing applications across industries. Its ability to adhere to different materials enables engineers and technicians to use RTV sealant for sealing joints, gaskets, enclosures, and other critical components.

Versatility in Sealing Applications:

Whether it's sealing electrical enclosures, automotive components, HVAC systems, or aerospace structures, RTV sealant offers a versatile sealing solution. Its ability to accommodate movement, resist environmental factors, and provide a reliable barrier against contaminants makes it an invaluable choice in numerous industrial sectors.

Final words:

RTV sealant, with its unique properties and outstanding performance, has earned its status as the go-to solution for industrial sealing.

Its ability to cure at room temperature, along with its versatility, weather resistance, chemical resistance, and flexibility, make it an exceptional choice for a wide range of sealing applications.

By understanding the factors that influence RTV sealant cure at room temperature and appreciating its numerous benefits, industries can confidently rely on this reliable and efficient solution for their sealing needs.