Learn how to Bond Silicone Rubber to different Materials

Silicone is one of the most common engineering materials available for many applications.

This is not only due to the exceptional properties, but also the ability to bind it to many materials. Whether you are working with metals, or plastic, bonding them with silicone rubber is an easy process.

Let’s look at some practical ways to bond silicone rubber to other materials.

1. Bond Silicone Rubber to Metal

Silicone Metal Bonded Parts
Silicone Metal Bonded Parts

Silicone rubber has different properties and characteristics that enable it to bond with other materials such as metal. In case you want to bond silicone rubber with metals then you can follow this simple process:

Step 1: Choose the Right Metal and Silicone Rubber Grade

In this step, one should collect all the materials needed during the bonding process. Examples of materials include silicone adhesive, isopropyl alcohol or acetone, primer, sandpaper, and a clamp.

Step 2: Clean Surfaces and Roughen Surfaces

After collecting all materials, it is now time to clean the surfaces. This is usually done to help to increase the effectiveness of the bond and help to remove any contaminants present on both silicone rubber and the metal.

After cleaning, you will then roughen the surface of the metal. This is done with the help of sandpaper to help increase the surface area energy of the material being bonded.

Step 3: Apply Primer

The fourth step of this process is applying the primer. You should apply to improve the adhesion since it is applied on both of the surface of the silicone rubber and the metal.

Once the primer has been applied the next step is to apply silicone adhesive. You should follow the manufacturer’s instructions when doing so and apply it onto the surface of the metal.

After applying the silicone adhesive, you can assemble or join silicone rubber to metal. It is simple process – simply align and press the two surfaces together.

This is usually done by aligning and pressing the two surfaces together and when doing so one should use a clamp to hold them together.

When the two surfaces have been assembled or joined together they are left to cure for some time depending on the instruction given or written by the manufacturer.

Finally, you must check the quality of the bond between silicone rubber and metal.

2. Bond Silicone Rubber to Plastic

Silicone Rubber and Plastic
Silicone Rubber and Plastic

There are different types of plastics but not all plastics can be bonded with silicone rubber. Remember, each plastic has varying characteristics. Therefore, it is advisable you check and select the right plastic that will bond with her or his silicone rubber.

Here are some steps that will help you bind silicone to plastic.

Step 1: Choose the Right Plastic Material and Silicone Rubber

Some of the main materials you will need for the process include silicone adhesive, plastic, acetone, clamp, gloves, sand paper, and primer.

When choosing plastic, you must consider their characteristics. Choose materials that will be compatible with the rubber material.

Step 2: Prepare Surface of Materials and Apply Silicone Adhesive

It is critical to roughen the plastic surface. You can do this using sand paper. Usually this process increases bonding surfaces.

Next, you should choose and apply silicone adhesive. With the right silicone adhesive, it is easy to bond the silicone rubber and the plastic.

Apply the silicone adhesive onto the surface according to the instructions given.

After you have carefully applied the silicone adhesive on the surface the next step is to join or assemble the silicone rubber and plastic.

Carefully align silicone rubber and plastic together then press to form a good bond.

Once the two have been assembled it is left to cure for some time. The curing process time normally depends on types of adhesive.

3. Glue Silicone Rubber to Silicone Rubber\Elastomer

Bonding Silicone Rubber
Bonding Silicone Rubber

Silicone rubber is also known for nonstickable nature. This property sometimes causes hindrance during bonding.

Gluing silicone rubber into another silicone rubber or elastomer requires the right adhesive that can help to bond these two materials.

With these steps, you can easily bond silicone rubber to other rubber materials:

Step 1: Choose the Right Silicone Material and Adhesive

Among the key materials you will need to this process include silicone adhesive, acetone or isopropyl alcohol, sand paper, clamps, gloves, and silicone primer among others.

Next, you will prepare the two surfaces by cleaning using acetone or isopropyl alcohol to help remove any kind of contaminants such as oil, and grease among others.

Step 2: Prepare Surfaces and Bond

Next, prepare the silicone rubber surfaces through roughening. Usually, this process helps to improve the adhesion properties.

After roughening the surface, you can now apply the primer to help create a stronger bond between the two materials.

Silicone adhesive is then applied onto the surface evenly following the instructions given or written by the manufacturer.

The two surfaces are then aligned and pressed together carefully and a clamp is used to hold the two materials and left to cure.

Methods of Gluing Silicone Rubber

1. Using Primer and Cyanoacrylate

This is one of the methods of gluing silicone rubber and it is done by brushing the primer onto the silicone surface and leaving it to settle for some time.

2. Room Temperature Curing Silicone Adhesive

When using room temperature as a method of gluing silicone rubber with the help of silicone adhesive, leave at specified temperature. Usually, this helps to create a stronger bond between the two materials.

3. Heating Curing Silicone Adhesive

The advantage of using heat to help glue silicone rubber it takes the shortest time to bond strongly. This method is mostly used by industrial application

4. Adhesive

Silicone adhesive is used to help improve the bond between silicone rubber and other materials.


As you can see, you can bond silicone rubber to virtually all materials from metal, rubber, wood, and plastic amongst other. The most critical stage is choosing the right adhesive and material.

For all your silicone products LEGENDAY is you trusted supplier in China – contact us now.

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