Siliconi Defoamers and Deaerators from MegaChem (UK)

May 17, 2018 4:45 pm Published by

Controlling unwanted air and foam is essential to an effective and profitable operation within many industries. Having air or foam present during production can result in problems in the manufacture and application of the products; preventing efficient filling of containers and resulting in an inferior product if not controlled.

At MegaChem (UK) Ltd, we stock a large range of additives used to improve the quality of various products including defoamers; being the sole UK agent of Siliconi defoamers and deaerators for the Architectural Paints, Coatings and Ink markets.

Find out more about the range of silicone and silicone-free defoamers and deaerators from Siliconi and their uses across a wide range of applications.

About Siliconi

Siliconi is a worldwide leader in the production of silicone additives for inks, paints, industrial coatings and adhesives. As well as producing additives using 80% green renewable energy, Siliconi shows a commitment to the environment and sustainability by producing additives that are:

  • VOC free.
  • Odourless.
  • APEO free.
  • Formaldehyde-free.
  • Suitable for eco-label paints.

Watch the video below to find out more about Siliconi’s range of additives:

Uses of Siliconi Defoamers and Deaerators


The process of creating protective coatings is complex, with a number of different components needed to develop the different properties and colours; the addition of certain components can create foam within the system.

Foam within industrial coatings reduces the quality of the coat, with the small air bubbles hindering the durability of the film, making the process of painting harder and weakening the protective qualities of the paint.

Given that common uses of industrial coatings are corrosion resistance, electrical varnishing and anti-graffiti; the presence of foam can have devastating effects within these environments.

Siliconi’s silicone defoamers and deaerators are designed to reduce the build-up of foam during production, with options available that are suitable for the production of water-based coatings.

Architectural Paints

As with industrial coatings, the different components used in paints can result in the formation of foam during production.

Foam within architectural and decorative paints slows down the efficiency of production, forcing delays whilst the foam naturally breaks down. Similar to their industrial counterparts, architectural paints containing foam will be inferior – creating problems during application and reducing the durability of the coat.

We have a range of Siliconi defoamers and deaerators designed to suppress foam and aeration during paint manufacture, with products suitable for water-based and eco-label paints; the Siliconi WS defoamer series is one of the most versatile ranges on the market.



The presence of foam within ink is a costly problem that often results in machine downtime and frustration for operators. Using ink with foam present causes colour inconsistency, loss of sharpness, defects within the print and may even render small text unreadable.

Choosing the right defoamer or deaerator is essential in this environment, as an additive with the wrong properties can cause surface defects such as pinholes and craters within the ink.

We provide a range of Siliconi defoamer and deaerators designed specifically for use within inks, with surface active properties, low surface tension and high spreading ability to ensure both micro and macrofoam is dispersed quickly and effectively.

We also offer Siliconi Silicone based defoamer and deaerator products for the following markets: Textiles, Water Treatment, Food, Paper and Detergents.


What’s the Difference Between  a Defoamer and a Deareator?

The terms ‘defoamer’, ‘deaerator’, ‘anti-foams’ and sometimes ‘anti-foam agents’ are used interchangeably throughout the industry to describe products used to prevent or control foam.

Defoamers are preferred in applications where foam needs to be destroyed quickly (particularly in waterborne products) from the surface of the product, whereas deaerators are more commonly utilised when finely dispersed air needs to be removed from the body of the product.

The lack of distinction comes as most foam controlling products can serve either role in some part. At MegaChem (UK) Ltd, we have the knowledge and expertise to recommend the optimal product for your operation.

What’s the Difference Between Macrofoam and Microfoam?

Think of the milk that is used to create your cappuccino, foamy and airy with lots of large bubbles; this would be referred to as a macrofoam – clear visible large bubbles on the surface of the liquid that can break with no assistance.

In contrast, imagine the milk that is used to create a latte, the barista has created the air and bubbles that were present on the surface of the milk used for the cappuccino, but has then instead introduced them to the liquid to create a smoother, heavier foam.

This would be referred to as a microfoam, with very small but much more stable bubbles within the liquid. The presence of microfoam is not always picked up until application where surface defects will become clear; microfoam commonly affects coatings, paints and inks.

 Microfoams and Macrofoams

Will Defoamers and Deaerators Impact on Product Quality?

Provided that the correct defoamer or deaerator is used in the right quantity and applied correctly for each application, the presence of these additives will improve the quality of the product through the elimination of any foam.

High Quality Defoamers and Deaerators at MegaChem (UK) Ltd

At MegaChem (UK) Ltd, we stock the full range of Siliconi defoamers and deaerators for the applications discussed in this post. If foam is impacting on the quality of your product, we can help; with a team of experts well placed to advise you on any aspect of defoamer or deaerator application.

Give one of our technical experts a call today on + 44 (0) 1291 422747 or fill out a contact form below and we’ll get back to you.


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This post was written by Jack Rowland

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