What is RTV-1 Silicone: The Complete Guide

Do you want to know more about RTV-1, its advantages, its chemical structure, properties, and other details?

Well, this article will cover all you need to know. Read on to be informed.

What is RTV Silicone Rubber?

This silicone rubber type is one that experiences curing smoothly at room temperature.  In addition, it is able to resist heat up to 180 °C. This silicone rubber type can be found in both RTV-1 and RTV-2.

RTV Silicone Rubber
RTV Silicone Rubber

Advantages of RTV-1 Silicone

RTV-1, or RTV component 1, comes with countless benefits. They include:

  • Easy to use
  • High versatile
  • Has good adhesion
  • Durable
  • Elastic and flexible
  • Safe and non-toxic

Chemical Structure of RTV-1 Silicone

RTV silicone is made from a combination of silicone fillers and polymers, including organoeactivesilane catalysts. Thus, RTV-1 uses the moisture within the atmosphere for curing from outside into the center.

When temperature, surface area, and humidity increase, the time to cure reduces.

Chemical Structure for RTV Silicone Rubber
Chemical Structure for RTV Silicone Rubber

Properties of RTV-1 Silicone

  1. Cures at room temperature

When exposed to atmospheric moisture, it cures. No heat is needed for it to cure.

  1. Weather resistant

It resists UV radiation and weathering, which makes it ideal for outdoor use. It maintains all properties even when exposed to ozone, moisture, and temperature fluctuations.

  1. Chemical resistant

Chemically resistant and inert to different solvents, chemicals, and oils.

  1. Temperature resistant

This silicone temperature is within -60°C to 200°C based on the ideal formulation.

  1. Electrical insulation

Is able to protect sensitive electronic parts from dust, contaminants, and moisture.

Properties of RTV-1 Silicone
Properties of RTV-1 Silicone

RTV-1 VS RTV-2 Silicone

Below are ways to compare these components:

· Key Components

RTV-1 silicone is ready to use directly from its container because it is premixed. It doesn’t require adding other parts, while RTV-2 has two different parts (a base and curing agent) that need to be combined in specific ways before use.

· Curing Temperature

RTV-1 easily cures at the temperature of the room, which is the same for RTV-2. However, curing for RTV-2 can be made faster with some heat added.

· Curing Speed

RTV-1 cures faster compared to RTV-2, which takes a longer time to cure fully.

· Control Over Properties

RTV-1 silicone doesn’t have much control over cured silicone properties. On the other hand, RTV-2 has much control over cured silicone properties because it is cured with ideal requirements in mind.

· Comparing Uses

RTV-1 is used in processes where specific control over the properties of the material isn’t the aim but rapid curing is required, like:

  1. Sealing
  2. Coating
  3. Encapsulating
  4. Bonding

RTV-2 adversely, works perfectly if you need to personalize flexibility, strength, or time for curing. Also, where specific control is needed over material properties, they work. They are used mostly in applications such as:

  1. Casting
  2. Molding
  3. Prototyping
RTV- 2 Silicone Rubber
RTV- 2 Silicone Rubber

RTV Silicone vs Regular Silicone Specifications

Comparing the Curing Process

  1. RTV silcone instantly experiences curing even at room temperature. With regular silcone, higher heat is needed for curing. This is mostly higher than 100 ° At this level curing is reached.
  2. With RTV silicone, heat isn’t needed additionally for curing, while regular silicone requires industrial ovens to heat cure, which might not work for all uses.

Comparing Applications

  1. RTV is versatile and can be used to bond, seal, coat, and do quite a number of other things. On the other hand, regular silicone is ideal for specific uses where electrical insulation, heat resistance, or biocompatibilities are a necessity.
  2. RTV comes in 1 or 2 component formulations, which makes it flexible and easy to use. On the other hand, regular silicone is common in industries where specific control over the properties of specific materials is needed.

Comparing Flexibility

  1. RTV retains its flexible nature even as the temperature changes. Therefore, you will be able to use them in projects where thermal expansion is necessary.
  2. On the other hand, regular silicone elastic and flexible features vary based on the ideal curing process or formulation. But it still has flexibility over different temperature ranges, which can be similar to RTV.

Comparing Adhesion

  1. RTV silicone has strong bonding to different substrates, like ceramics, metals, some plastics, and glass. Adversely, adhesion properties might differ based on surface features and formulation.
  2. RTV is able to work with porous and non-porous surfaces even when primers are not added. Adversely, with regular silicone, some formulations will necessitate primer use to enhance adhesion to some substrates.

Comparing Customization

  1. With RTV, some properties like curing time and hardness, including elongation, can be easily customized by choosing the ideal formulation or modifying its mixing ratios.
  2. On the other hand, regular silicone offers a varied formulation range with different properties. This permits it to be personalized depending on ideal user necessities.
Regular Silicone
Regular Silicone

RTV-1 Silicone Uses

Here are some unique RTV-1 silicone applications:

  1. Used for bonding and sealing in various industries like automotive, construction, plumbing, appliances, and electronics.
  2. Coating
  3. Encapsulating
  4. Molding
  5. Casting
  6. Art and sculpture
  7. Household and consumer products
  8. Industrial uses


1. Is RTV Silicone Waterproof?

Yes, it is waterproof. When cured, it forms a durable and flexible seal that is resistant to moisture and water infiltration.

2. What is RTV-1 Silicone Good for?

It can be used to bond, seal, encapsulate, coat, and mold. This is due to its versatility.

3. Is RTV Silicone High-temp?

Yes. Some RTV silicone formulations are made to withstand temperatures that are high.


With these details provided in this article, always choose to make better decisions. Being informed is a great way to begin. Also, knowing which silicone type will work for your process helps.

For all your silicone rubber products, LEGENDAY is you trusted partner – contact us now.


More resources:

Is Silicone a Rubber, Elastomer, or Polymer? – Source: LEGENDAY

Silicone Melting Temperature – Source: LEGENDAY

Where does Silicone Rubber Come from? – Source: LEGENDAY

Understanding UL94v-0: Silicone Rubber – Source: LEGENDAY

History Of Silicone – Source: LEGENDAY

Step-by-step Silicone Manufacturing Process – Source: LEGENDAY

What is HCR Silicone – Source: LEGENDAY

Update cookies preferences
Scroll to Top