Non-Silicone Defoamers

Although the terms are often used interchangeably, there can sometimes be a difference between a “non-silicone” defoamer and a “silicone-free” defoamer. While the term is open to some interpretation, a “non-silicone” defoamer is typically described as a type of defoamer that does not contain “free silicone” within its composition. This means that there’s no silicone polymer freely floating in the body of the defoamer. For example, think of non-alcoholic (NA) beer. Even though it’s marketed as being NA, non-alcoholic beer often contains some small amount of alcohol, usually less than 1%. In some cases, this analogy applies to a non-silicone defoamer, whereby a tiny amount of silicone may be present. However, if present, any such silicone is typically bound to the surface of the hydrophobic silica rather than being freely available. By contrast, a “silicone-free” defoamer is completely devoid of any silicone whatsoever and is an alternative option for applications where no silicone can be tolerated.

Non-Silicone Defoamer Composition

Non-silicone defoamers from Applied Material Solutions (AMS) are available in:

• Water-based compositions
• Oil-based compositions
• Surfactant-based compositions

However, non-silicone defoaming agents typically all contain surfactants. This enhances their ability to disperse in water, making them more effective in reducing or suppressing foam. Defoamers that are non-silicone are often more biodegradable than their silicone counterparts, and they’re less likely to result in spotting and discoloration or cause negative membrane effects.

Types of Non-Silicone Defoamers

Some common types of non-silicone defoamers include:

Non-Silicone Defoamer Benefits and Applications

Some potential benefits of non-silicone defoamers include:

• Minimized surface defects. Non-silicone defoamers are sometimes preferred because silicones may cause unwanted defects in the surface of dried films and coatings.
• Reduced residue deposition. Compared to silicone-containing products, non-silicone defoamers are often less likely to leave residue.
• Safer for filtration membranes. Compared to silicone-containing products, some types of non-silicone defoamers are less likely to adversely affect filtration membranes, resulting in better filtration performance and reduced maintenance costs.
• Better cost-effectiveness and availability. Non-silicone defoamers are often less susceptible to drastic swings in price and availability. In the past, silicone materials have been subjected to price fluctuations and shortages, leading to a higher focus on the development of non-silicone alternatives.

Because of their many benefits, non-silicone defoamers are popular for a wide variety of industries and applications, such as:

Non-Silicone Defoamers From Applied Material Solutions

At AMS, we offer an extensive range of both aqueous and non-aqueous non-silicone defoamers for a myriad of applications.

Water-Based Emulsions and Dispersions

Water-based defoamers are typically between 60% and 90% water, as the name suggests. Many of these defoamers are oil-in-water emulsions, containing some amount of oil or fat. They’re often readily biodegradable and more environmentally friendly compared to synthetic materials, and they can be more affordable and better performing than other types of defoaming options for deaeration and foam suppression.