will ge silicone sealant adhere to molded silicone


Silicone Sealant: Adhesion Potential on Molded Silicone Surfaces


Silicone sealants are widely used for various applications due to their exceptional adhesive properties and flexibility. However, when it comes to bonding two silicone surfaces, particularly molded silicone parts, there can be some uncertainties regarding the adhesion. This article aims to address the question: "Will GE silicone sealant adhere to molded silicone?" By exploring the determination of adhesion, compatibility factors, surface preparation, and application techniques, this article will provide a comprehensive understanding of the adhesion potential between GE silicone sealant and molded silicone surfaces.

Determining Adhesion Potential

Before considering the adhesion potential, it is crucial to understand the composition and properties of both the silicone sealant and the molded silicone material. GE silicone sealants are typically formulated to adhere well to a variety of surfaces, including glass, ceramic, metal, and most plastics. On the other hand, molded silicone parts, which are produced through a molding process using liquid silicone rubber (LSR), possess a cured silicone surface.

Compatibility Factors

The compatibility between silicone sealants and molded silicone surfaces is influenced by several factors. First, it is important to ensure that the silicone sealant chosen is compatible with the specific type of molded silicone. Certain types of silicone sealants may not adhere well to certain grades or additives used in molded silicone parts. Therefore, it is advisable to consult the manufacturer's recommendations or conduct compatibility tests prior to application.

Surface Preparation

Proper surface preparation is essential for achieving strong adhesion. Both the molded silicone surface and the areas where the sealant will be applied should be thoroughly cleaned and free from any contaminants such as dirt, grease, and oils. Isopropyl alcohol or a mild detergent can be used to clean the surfaces. Additionally, mechanical abrasion techniques, like sanding or roughening the surface, might be necessary to enhance the adhesion of the silicone sealant.

Application Techniques

To ensure a successful bond, correct application techniques should be followed. Here are some essential tips for applying silicone sealant on molded silicone surfaces:

1. Apply the sealant in a well-ventilated area at the recommended temperature and humidity levels, as specified by the manufacturer.

2. Cut the nozzle of the sealant cartridge to the desired bead size. It is recommended to cut the nozzle at a 45-degree angle to achieve a smooth and consistent application.

3. Apply the sealant evenly to the molded silicone surface. Maintain a consistent pressure on the trigger while moving the bead in a continuous motion.

4. Use a caulking tool or a smooth-edged instrument to smoothen and shape the sealant, ensuring good coverage and eliminating air pockets.

Curing and Adhesion Evaluation

After the sealant is applied, it goes through a curing process. During this stage, it is important to allow sufficient time for the sealant to fully cure, as specified by the manufacturer. Once cured, the adhesion strength can be evaluated through various tests.

One common method for assessing adhesion is the ASTM D4541 pull-off test. In this test, a defined force is applied perpendicular to the bonded surface, and the maximum force required to pull the sealant off is measured. Alternatively, peel tests and lap shear tests can be performed, depending on the specific requirements and recommended testing procedures.


In conclusion, GE silicone sealants have the potential to adhere to molded silicone surfaces, provided that compatibility factors, surface preparation, and correct application techniques are taken into consideration. It is crucial to select a sealant compatible with the specific molded silicone material and to ensure proper cleaning and preparation of the surfaces before bonding. By following recommended application techniques and allowing sufficient curing time, a strong and durable bond can be achieved between GE silicone sealants and molded silicone surfaces.


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