is rtv silicone sealant aerobic or anaerobic


RTV Silicone Sealant: Unraveling the Mystery of Whether It's Aerobic or Anaerobic


RTV silicone sealant is a versatile adhesive commonly used in construction, automotive, and other industrial applications. Its ability to create a watertight and airtight seal makes it a popular choice among professionals and DIY enthusiasts alike. However, there is often confusion regarding whether RTV silicone sealant is aerobic or anaerobic. In this article, we will explore the characteristics of RTV silicone sealant and determine its behavior in different environments.

Understanding Aerobic and Anaerobic Sealants:

Before delving into the specifics of RTV silicone sealant, it is essential to clarify the differences between aerobic and anaerobic sealants.

Aerobic Sealants:

Aerobic sealants require the presence of oxygen to cure properly. These sealants harden when exposed to air, making them ideal for applications where the sealant is exposed. They create a strong bond and form a durable seal.

Anaerobic Sealants:

On the other hand, anaerobic sealants cure in the absence of oxygen. They remain in a liquid state when exposed to air but harden when confined in a tight space between two components. Anaerobic sealants are commonly used for threadlocking, gasketing, and retaining applications.

Characteristics of RTV Silicone Sealant:

RTV silicone sealant, which stands for Room Temperature Vulcanizing, is known for its ability to cure at room temperature without the need for any external heat or pressure. It is widely used due to its excellent adhesion, flexibility, and resistance to moisture and chemicals. But is RTV silicone sealant aerobic or anaerobic? Let's find out.

1. Versatility and Adhesion:

RTV silicone sealant is a versatile adhesive with excellent adhesion to a wide range of substrates, including glass, metal, plastic, and ceramics. It forms a strong bond, allowing it to be used in various sealing applications. Whether it is applied to a joint, crack, or seam, RTV silicone sealant provides a reliable seal that withstands environmental factors.

2. Curing Mechanism:

RTV silicone sealant is an aerobic sealant that cures when exposed to air. However, it is important to note that the curing process is different from that of other aerobic sealants. RTV silicone sealant cures through a moisture reaction, rather than relying solely on oxygen. It absorbs moisture from the surrounding environment, triggering the crosslinking process.

3. Time and Temperature:

An essential factor in understanding the behavior of RTV silicone sealant is the time and temperature required for curing. Most RTV silicone sealants form a surface skin within 15 to 30 minutes of application under normal room temperature and humidity conditions. However, complete curing may take up to 24 hours or longer depending on the sealant thickness, humidity level, and temperature.

4. Environmental Factors:

RTV silicone sealant exhibits excellent resistance to moisture, UV radiation, and temperature extremes, making it suitable for both interior and exterior applications. Whether sealing joints in a bathroom or outdoor weatherproofing, RTV silicone sealant remains effective and durable. Its ability to withstand a wide range of environmental conditions makes it a reliable choice for various sealing requirements.


In conclusion, RTV silicone sealant is indeed an aerobic sealant that cures through a moisture reaction rather than relying solely on oxygen. Its ability to form a strong bond, resistance to moisture and chemicals, and versatility make it an excellent choice for various sealing applications. Whether you're working on a construction project, automotive repair, or any other task that requires a reliable seal, RTV silicone sealant proves to be a valuable tool. Understanding the characteristics of RTV silicone sealant will help you utilize it effectively and ensure successful outcomes in your projects.


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