material attached to surface prepared with silicone primer

Silicone primers

NuSil® supplies expertly formulated silicone primers to improve the bond between silicone adhesives and the substrate being joined.

NuSil silicone primers help to ensure the effectiveness and long-lasting performance of silicone adhesives by preparing a substrate surface for adhesive application. They also aid in adhering to materials with low surface energy by activating the surface to provide the best bond possible.

The NuSil portfolio of silicone primers has been developed to help improve adhesion for a wide range of substrates: silicone, metals such as aluminum, stainless steel and titanium and a wide range of plastics and rubbers, including polytetrafluoroethylene, polycarbonate, polyurethane, polyimide, ABS, PEEK and polysulphone.

Our extensive line of silicone primers is moisture-sensitive and time-dependent: they will react to moisture in the air, and it is typically recommended that they cure for 10-15 minutes before a silicone adhesive is applied. They can be applied through a variety of methods including spraying, wiping, brushing or dipping.

NuSil can collaborate with you to assess the surface properties of your substrate and recommend both the best silicone adhesive and best silicone primer to work with your production processes and the devices you are manufacturing.

Custom formulations tailored to your needs

NuSil has the expertise, processes, and proprietary technology to customize our silicones based on your unique specifications. We leverage our insight into the unique silicone chemistry and material properties to supply off-the-shelf and custom formulations tailored to your process and end-application performance requirements.

Learn more about how we can help you get the products you need.

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Example of pacemaker with silicone components shown

Medical implants

Medical device manufacturers joining parts with silicone adhesives can count on NuSil silicone primers to help create the best bond possible.

infant with silicone airway device

General healthcare

When assembling devices used in general healthcare applications, NuSil silicone primers help produce components with long-lasting bonds.

Curiosity Mars rover incorporates silicone protective materials


NuSil offers silicone primers specially formulated for elements of spacecraft including solar panels and other electronic devices that will face the harsh conditions of outer space.

military aircraft in flight

Aviation & defense

NuSil offers a wide range of primers specifically formulated for use with substrates commonly used on aviation and defense platforms.

Children using large digital touchscreen display

Optoelectronics & electronics

From adhesion to potting and encapsulating, primers ensure the best bond between the silicone adhesive and underlying substrates.

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How can we help you?

NuSil experts will help to ensure that you choose the right NuSil silicone primer based on the adhesive you are using, and the substrates being adhered.

Avantor®, a Fortune 500 company, is a leading global provider of mission-critical products and services to customers in the biopharma, healthcare, education & government, and advanced technologies & applied materials industries. Our portfolio is used in virtually every stage of the most important research, development and production activities in the industries we serve. Our global footprint enables us to serve more than 300,000 customer locations and gives us extensive access to research laboratories and scientists in more than 180 countries. We set science in motion to create a better world.