How Magsil® talc enhances coating formulations


powder coating

Achieving the perfect coating formulation lies within getting the right balance of durability, aesthetics and functionality. The performance of the coating and the lifespan of the coated surface relies on this perfect mix, and all of this can be achieved with the introduction of talc.

Talc stands out as a versatile and essential ingredient in the world of coatings, offering a unique set of properties that contribute to the performance and aesthetics of various products. Industrial coatings can be revolutionised with this one ingredient, and Magsil® talc is an exceptional product that can be used in a range of surface coatings.

RBH has extensive knowledge of talc and its industrial applications, and has been sourcing and supplying a complete range of grades under the Magsil® trade name for decades. We’re here to share some of our insights into this high-performance product range, explaining why and how it could just transform your coatings.

Introducing Magsil® talc

First, let’s take a look at what talc is. It’s a naturally occurring mineral composed of hydrated magnesium silicate and has been used for centuries across various applications, due to its unique soft, non-abrasive and inert properties

However, Magsil® talc is not your average talc. It is the result of meticulous sourcing, processing, and refinement to meet the exacting demands of modern coatings technology. Derived from premium-grade deposits and subjected to rigorous quality control measures, Magsil talc embodies high purity, whiteness, consistency, and reliability.

Why is talc used in coatings?

In coatings, talc serves multiple purposes, thanks to its versatility and unique characteristics. One of the primary roles of talc is as an extender, helping to reduce costs by replacing expensive resins while maintaining or even enhancing key properties of the coating.

Key benefits

1. Used as a matting agent

The addition of talc contributes to the finish and texture of the coated surface, and is widely used as a matting agent in applications where a low-gloss or non-reflective finish is desired.

By diffusing light and reducing glossiness, talc can be used to bring a matte or satin appearance to coatings and helps manufacturers achieve a range of surface textures, from subtle matte finishes to more pronounced satin effects. This type of sheen control is essential in various applications such as paints, varnishes, and industrial coatings.

2. Improved scrub resistance

Talc enhances the scrub resistance of coatings which is a critical property, particularly in applications where the coated surface is subjected to frequent cleaning or abrasion. 

The presence of talc helps to distribute any applied force more evenly throughout the coating, reducing localised wear and making it more durable and long-lasting. This is ideal for coatings used in high-traffic areas or outdoor settings.

3. Reinforcement 

Acting as a reinforcing filler in coatings, talc helps to improve mechanical properties such as stiffness, impact resistance, and dimensional stability.

This also helps to enhance the coating’s cohesion and adhesion properties, ensuring a strong bond between the coating and the substrate. This results in coatings that exhibit superior adhesion and resistance to delamination, even under challenging environmental additions.

protective coating applied to wooden surface

4. Enhanced anti-corrosion

Talc contributes to the anti-corrosion properties of coatings. The plate-like structure of talc acts as a partial barrier protecting the underlying substrate from environmental factors like moisture and chemicals.

This is ideal for protecting metal surfaces from degradation and rust formation, extending the lifespan of coated metals. 

5. Improved rheological control

Talc helps in controlling the rheology of coatings, ensuring proper flow and application characteristics during the coating process which results in a smooth application and uniform coverage.

As a rheological modifier, talc facilitates the dispersion of pigments, fillers and additives within the coating, promoting even distribution and preventing settling or agglomeration. This results in coating formulations with consistent colour, texture, and performance, enhancing the overall quality of the finished product.

Applications of talc in coatings

Talc finds applications in a wide range of coatings, including but not limited to:

  • Architectural paints: Enhances opacity, hiding power, and scrub resistance, resulting in coatings that provide excellent coverage, durability, and cleanability for interior and exterior surfaces.
  • Automotive coatings: Increases mechanical strength, scratch resistance, and corrosion protection, ensuring long-lasting finishes that withstand daily use and exposure to harsh environments.
  • Industrial coatings: Improves barrier properties, chemical resistance, and adhesion, making them ideal for protecting metal, concrete, and other substrates in industrial settings against corrosion, abrasion, and chemical exposure.
  • Wood coatings: Enhances surface smoothness, adhesion, and moisture resistance, resulting in finishes that provide both aesthetic appeal and long-term protection for interior and exterior wood surfaces.
  • Powder coatings: Acts as a flow modifier and texturising agent, improving flow and levelling during application and providing a range of surface textures and finishes for various applications.
  • Marine coatings: Offers superior moisture resistance, abrasion resistance, and antifouling properties in marine coatings, protecting boats, ships, and marine structures against corrosion, fouling, and environmental degradation in marine environments.

Environmental considerations

Talc is generally considered safe for use in coatings as a low-toxicity mineral which is not classified as hazardous to human health or the environment. It’s abundant in nature and is mined using environmentally responsible practices, however, as with any mineral extraction process, talc mining can have localised environmental impacts. 

To mitigate these impacts, responsible mining practices and strict environmental regulations are essential. Manufacturers are exploring sustainable options that offer similar benefits to talc while minimising the environmental impact of coatings.

As the industry continues to evolve, the importance of talc in coatings remains significant, with ongoing research and development aimed at optimising its use while addressing environmental considerations. Its compatibility with environmentally friendly coatings continues to make it a preferred choice for coatings formulators seeking sustainable solutions.

Magsil® talc for your coating formulation

Whether you are producing a complex industrial coating or a simple emulsion paint, Magsil® talc is the ideal additive to enhance its performance and longevity. RBH offers bespoke solutions that address your individual needs and can offer a range of Magsil® grades to optimise your formulation requirements. Contact our sales team to find out more.

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