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Butyl Rubber Sealant Tape: Everything a Contractor Should Know

Tapes & Sealants

Posted on July 13, 2023

Discover the power of Butyl Rubber Sealant Tape - the versatile and reliable solution for all your sealing needs. With exceptional flexibility, strength, and waterproofing capabilities, Butyl Sealant Tape is the go-to choice for construction, automotive, aerospace, marine, HVAC, electrical, and more. Learn how to apply this powerful adhesive and find the perfect tape at Fastener Systems Inc. for your projects!

In the construction business, there is always a need for versatile and reliable sealing materials. Butyl rubber sealant tape is a heavy-duty adhesive that provides exceptional flexibility, strength, and waterproofing capabilities. It is a powerful solution that is used to tackle various sealing and waterproofing applications, from sealing windows and RVs to patching rubber roofs on boats and repairing glass. In this article, we will explore the different facets of butyl rubber sealant, including its uses and installation.

What is Butyl Rubber Sealant Tape?

Butyl Sealant tape is crafted from butyl rubber, a man-made material that was first synthesized during the early 1900s in order to strengthen traditional rubber adhesives. This innovative product surpasses natural rubbers in its capacity to stay sticky at far colder temperatures - an impressive feature that sets it apart from other adhesive materials.

What is Butyl Rubber Sealant Tape?


Butyl rubber is known for its exceptional impermeability to air, water, and other gasses, as well as its resistance to heat, chemicals, and UV radiation.

It has a very high adhesive level and sticks to most smooth surfaces quickly.

Made with a specialized high-temperature tempering process, butyl tape is thoroughly airtight and watertight to endure the harshest of weather conditions - from heavy rains to frigid winters, and its UV resistance helps to withstand direct sunlight with minimal damage.

Why is Butyl Sealant Tape Used?

There are several reasons why butyl sealant tape is chosen over other sealing materials:

  1. The excellent impermeability of butyl rubber makes it an ideal material for preventing the ingress of water, air, and other gasses. This is particularly important in applications where maintaining an airtight or watertight seal is crucial.
  2. Butyl sealant tape retains its flexibility over a wide temperature range, which allows it to accommodate movement and maintain its seal even under varying conditions. This makes it suitable for use in applications where the materials being sealed may expand or contract due to temperature changes or other factors.
  3. Butyl rubber is resistant to many chemicals, including acids, alkalis, and solvents, which makes butyl sealant tape suitable for use in environments where it may come into contact with such substances.
  4. Butyl rubber exhibits good resistance to UV radiation, which can cause the degradation and weakening of other sealing materials. This ensures that butyl sealant tape will maintain its performance even when exposed to sunlight for extended periods.
  5. Butyl sealant tape is generally easy to apply and can be installed without the need for specialized tools or equipment. This makes it a convenient option for sealing tasks in various applications like patching holes in gutters and repairing leaks in RV's.

Types of Butyl Rubber Sealant Tape

Butyl tape is a versatile material that is available in various thicknesses and widths. You can purchase it as rolls or pre-cut pieces to better fit the scope of your project. There are many grades available that boast distinct properties for different uses.

Butyl tape comes in single-sided and double-sided varieties, each of which is perfectly suited for specific tasks.

Single-side butyl tape works great when you need to bond two objects together whereas the latter can be used as a sealant or gasket. Plus, it's also available in various colors that make certain applications even easier!

Applications for Butyl Rubber Sealant Tape

Applications for Butyl Rubber Sealant Tape

Construction: In the construction industry, butyl sealant tape is widely used to seal joints, seams, and gaps in various building materials, such as roofing membranes, window frames, and metal panels.

Automotive: Butyl sealant tape is utilized in the automotive industry to seal and bond various components, such as windshields, sunroofs, and door panels.

Aerospace: The aerospace industry also takes advantage of the properties of butyl sealant tape by using it to seal joints, seams, and gaps in aircraft components.

Marine: In the marine industry, butyl sealant tape is used to seal seams, joints, and gaps in boat and ship components, such as hulls, decks, and windows. The tape's water resistance and durability make it an excellent choice for maintaining the watertight integrity of marine vessels.

HVAC and Ductwork: Butyl sealant tape is often used to seal joints and seams in heating, ventilation, and air conditioning (HVAC) systems, as well as ductwork.

Electrical: Butyl sealant tape can be employed to seal and insulate electrical connections and cable joints, to help prevent the ingress of water and other contaminants.

How to Apply Butyl Rubber Sealant Tape

Here are the general steps on how to apply butyl sealant tape:

1. The surface needs to be clean and dry. Before applying the butyl sealant tape, it is essential to clean the surface where the tape will be applied. Remove any contaminants that can affect the adhesive properties of the tape. Gently scrub the surface with a soft cloth or sponge, and if necessary, utilize a mild cleaning solution. Once complete, make sure to let the area dry completely.

2. Cut to length. It is important to have the tape at the correct length before applying it. Once it adheres. it will be difficult to remove.

3. Peel and stick. Butyl sealant tape usually comes with a protective backing to prevent it from sticking to itself during storage and handling. Carefully peel off the backing to expose the adhesive side of the tape. Position the adhesive side of the tape on the surface, and carefully align it with the area to be sealed.

4. Press the tape firmly against the surface to ensure full contact between the tape and the substrate. Smooth out any wrinkles, bubbles, or gaps to create a tight seal. In some cases, you might need to apply multiple layers of tape, particularly when sealing larger gaps or joints.

Fastener Systems Carries a Wide Selection of Butyl Sealant Tapes

Fastener Systems Inc. (FSI) is a great place to buy butyl sealant tapes as well as fasteners and other tools. We have been in business since 1984 and have customers in all 50 states. Our focus is on providing personalized service to every customer to ensure that you find the exact product that fits your needs. We have thousands of items in stock and can also fill custom orders for fasteners.

Reach out to us today for more information or to receive our free online catalog!