does silicone sealant corrode copper


Does Silicone Sealant Corrode Copper?

Silicone sealant is a versatile and widely used material in various industries and applications due to its exceptional sealing properties. However, when it comes to using silicone sealant with copper materials, concerns about potential corrosion arise. In this article, we will explore the effects of silicone sealant on copper and determine whether it corrodes this particular metal. Let's delve into this topic and understand how these two materials interact with each other.

Understanding Silicone Sealant

Before we can ascertain the impact of silicone sealant on copper, it is important to have a clear understanding of this material. Silicone sealants are synthetic elastomers made from a combination of silicone and other polymers. This highly flexible and durable compound is commonly used for various sealing and bonding applications due to its excellent adhesion properties. It offers exceptional resistance to moisture, heat, and extreme weather conditions, making it a popular choice in the construction, automotive, and electronic industries, among others.

Exploring the Nature of Copper

Copper is a widely used metal that possesses remarkable electrical conductivity, corrosion resistance, and antimicrobial properties. Due to its excellent thermal conductivity, it is often employed in electrical and plumbing systems. Copper's ability to withstand harsh environmental conditions and resistance to corrosion make it highly sought after for various applications.

The Reactions between Silicone and Copper

When silicone sealant comes into contact with copper, potential reactions can occur that may lead to corrosion. The primary cause for concern is the acetoxy curing process of silicone sealants. During this process, acetic acid is released as a byproduct, which can interact with the copper surface and initiate corrosive reactions. However, it's worth noting that this reaction is limited to certain types of silicone sealants and does not occur with all formulations.

Types of Silicone Sealants

To better understand the effects of silicone sealant on copper, it is essential to differentiate between various types of silicone sealants available in the market:

1. Acetoxy Cure Silicone Sealants: These sealants release acetic acid during the curing process, making them more likely to cause corrosion on copper surfaces.

2. Neutral Cure Silicone Sealants: These sealants use a different curing mechanism that does not produce acetic acid. Consequently, they are less likely to cause corrosion, even when applied to copper.

The Corrosion Debate

The topic of whether silicone sealant corrodes copper has sparked a heated debate within the industry. While some experts argue that the risks of corrosion are substantial, others maintain that modern silicone sealant formulations have minimized these concerns. To settle this debate, comprehensive tests have been conducted to evaluate the impact of silicone sealant on copper surfaces.

Laboratory Testing

Numerous laboratory experiments have focused on investigating the corrosion effects of silicone sealant on copper. These tests typically involve applying different types of silicone sealants on copper samples and analyzing the samples regularly for signs of corrosion. The results of these studies have been essential in determining the compatibility of silicone sealant with copper.

Findings of the Tests

The results of these tests indicate that the potential for corrosion depends largely on the specific formulation of the silicone sealant. Acetoxy cure silicone sealants have shown a higher rate of corrosion on copper, mainly due to the release of acetic acid during the curing process. On the other hand, neutral cure silicone sealants have demonstrated limited or no corrosion on copper samples.

Ensuring Compatibility

While neutral cure silicone sealants pose less risk of corrosion, it is still crucial to ensure compatibility between silicone sealant and copper surfaces. Before applying silicone sealant to copper, thorough cleaning and preparation of the surface are essential. Additionally, selecting a silicone sealant specifically designed for copper applications further reduces the potential risks.


In conclusion, the question of whether silicone sealant corrodes copper depends on the formulation of the sealant. Acetoxy cure silicone sealants releasing acetic acid during the curing process can potentially cause corrosion on copper surfaces. However, with modern neutral cure silicone sealants, the risk is significantly reduced. To ensure compatibility and minimize the risk of corrosion, it is important to choose the appropriate silicone sealant specifically formulated for use with copper materials.


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