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GRIT BLASTING

As part of our protective coating and tank lining services we are able to offer a range of grit blasting preparation services

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Grit blasting is still recognised as the best possible form of surface preparation as it both cleans and raises a surface profile, providing an excellent surface profile for new protective coatings to adhere to.

Grit blasting is still often referred to as sand blasting, however this is incorrect as it is illegal in the UK to use sand for blasting purposes due to the exposure to free silica if sand is used.

Conventional dry grit blasting makes use of either expendable or recyclable blast media. Typical expendable grit blast media as used in site applications would be copper slag, garnet or crushed glass.

The type of media used when grit blasting can be varied depending on the substrate being grit blasted and the surface profile required.

Cor Blast2

Conventional Grit Blasting

Dry grit blasting produces large amounts of dust which needs to be considered when planning a project.

In vessels and tanks this is easier to control using extraction and ventilation equipment. An example of this can be seen in this video.

Water Entrained Grit Blasting

However when blasting in dust sensitive locations or when encapsulation is not cost effective or viable other forms of grit blasting need to be considered. We have invested in two such technologies.

The first is the latest water entrained grit blasting, otherwise known as vapor blasting from Graco. We own Graco Eco Quip 2 wet blasting equipment which can be seen in this video.

Vapor blasting or water entrained grit blasting offers 92% less dust than conventional dry grit blasting. This is not the only benefit though, as the water used helps remove soluble metal salts, which if left in place will result in premature coating failure through osmotic blistering as a result of their hygroscopic action.

To prevent flash rusting when using water entrained grit blasting an anti-corrosion additive can be incorporated within the blast water.

Highly Controllable

Another benefit of this form of grit blasting is that it is highly controllable. The media feed and blast pressure can both be carefully controlled, making it suitable for delicate operations which would not be possible with conventional grit blasting. An example of this can be seen in this video

Sponge Blasting

Another low dust grit blasting solution that we have invested in is sponge blasting. Using our Sponge Jet equipment we are able to offer another dry form of grit blasting, but with approximately 90% less dust.

Like water entrained grit blasting, sponge blasting offers other benefits. This type of grit blasting is extremely controllable both through the amount of media used, blast pressure and media type.

This grit blasting technology has been used in aviation industries to remove a layer of paint at a time in order to minimise loss of thickness from wings and other components.

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