Coatings

A myriad of benefits

Coatings

Glass flakes have been utilized in a diverse range of applications bringing improvement in reinforcement, barrier and thermal properties.

The primary application glass flakes found was as a filler to improve both barrier properties and reinforcement in anti-corrosive coatings in the early 1970’s. Since then the use of glass flake filled materials in coating systems has grown significantly, as their inherent benefits have become more widely known. Nowadays, glass flake based coatings are recognised to give superior protection in a variety of industry sectors such as: marine, oil & gas, mining, power generation, chemical plants and storage facilities, paper pulp mills and many other areas.

Advantages of using glass flakes

Reduction of moisture vapour transmission

Although all polymers will convey moisture through them, the process can be slowed down by incorporating glass flakes. This is due to the morphology of the glass flake which is a high aspect ratio lamellar platelet. The ability of these platelets to align planar to one another and the substrate, when applied in a coating system, gives rise to an in-situ barrier creating a tortuous path through the coating. Even aligned flakes though do not present a continuous barrier but they do significantly extend the permeation path length compared to either an unfilled coating or those that contain granular or fibre fillers.

Reinforcement

Glass flakes improve mechanical properties, giving isotropic reinforcement across the plane of the platelet.

Improved tribological properties

Glass flake filled coatings are widely used for applications such as high traffic floor coatings. Such applications require significantly improved wear and abrasion resistance of a coating system that can be achieved by the addition of glass flakes. This is due to the nature of the glass which in general has a Mohs hardness and the ability of flakes to align in a parallel manner within the coating.

Formulation

Glassflake offers a wide range of products for use in coating systems. The formulation of a coating is not simply a case of adding an arbitrary amount of flake to a resin and expecting to have an ideal coating system. Consideration should be given to the flake thickness, particle size diameter, type of glass composition and whether a surface treatment is required to impart the properties required for a particular coating system.

We offer glass flakes from three standard glass compositions.

C type glass flakes – are made from standard chemical resistant C type glass, available with an average thickness of 5 microns and several particle size diameters:

GF750C series – nominal thickness Av. 5 +/-2 microns.

ECR type glass flakes – are glass flakes made from the ECR type glass with extra chemical resistance, available in several thicknesses and particle diameter distributions to suit most applications:

GF750 series – nominal thickness Av. 5 +/-1µm
GF300 series – nominal thickness 2.3-3.3 microns
GF100 series – nominal thickness 1.0-1.3 microns

E type glass flakes – glass flakes made from electrical grade glass, available in two thicknesses and different particle diameter distributions to suit most applications:

GF500ME series – nominal thickness Av. 5 +/-2µm 
GF100ME series – nominal thickness 1.0-1.3 microns

Depending on the customer requirements, we supply glass flakes with or without surface treatment. We offer surface treatment option with four silane types listed below, which in turn give a wide range of functionality.

  • Amino
  • Vinyl
  • Epoxy
  • Acrylic

 

The silane is readily bonded to the glass flake surface aiding wet out, and facilitates dispersion in the coating. The effect on physical properties will be determined by the degree of interaction between the silane, glassflake and coating. For further info please contact us

Silane compatibility with thermosetting resins
Functional GroupVinyl SilaneEpoxy SilaneAcryl SilaneAmino Silane
Melamine N YY N Y
Phenol N Y N YY
Epoxy N YY N YY
Urethane N Y N YY
Polyimide N Y N Y
Unsaturated PE Y Y YY N