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Shot Blasting

Problems with inadequate shot blasting result in sub-standard work which is likely to cause delaminating or peeling of the coating, exposing your structure to further and faster deterioration. Therefore, controlling the conditions in which preparation (shot blasting) and coatings works are undertaken is critical.

Emtrade shot blast room is environmentally controlled; the filtration system is pulling in fresh air and pushing out the dust from the air. All the material (the actual shot itself) left on the floor is reprocessed via a hoper in the ground. The atmosphere in the blast room is therefore clean ensuring that top quality preparation is achieved.

Shot blasting creates and effective way of preparing a surface for re-coating. At Emtrade we offer a manual dry shot blasting to achieve minimum SA 2.5 cleanliness (Swedish Visual Standard i.e. near white metal).

Main type of media used here is chilled iron (G17 or G17/G34 blend). This media is commonly applied for structural and stainless steel and is ideal for compressed air blasting.

Shot blasting (blast cleaning/surface preparation) must be performed using the correct blast-profile for the specialist coatings to work. Blast-profile depths and roughness are critical factors to achieve the correct blast-cleaning standards.

The 80/20 rule will normally apply in all cases, under which at least 80% of the surface area must show a minimum blast-profile depth either equal to, or above, the minimum depth as shown on the specification. The remaining 20% of the area being blast-cleaned must have a minimum of 80% of the stated blast-profile depth.

Example – If the specified depth of the blast-profile is 60µm, then 80% of the surface area must have a profile depth of 60µm or above. The remaining 20% of the surface area being blast-cleaned must have an absolute minimum profile-depth of 48µm.

The roughness of a blast-profile is controlled by the type of media used. We can achieve a blast –profile depth of 60µm using round shot, but there would be no roughness factor whatsoever and hence no mechanical ‘key’ for organic coatings, like Zinga, to adhere. Such a profile would result in a disaster in virtually every case, with expensive consequences. Most of high-performance coatings have the minimum rugosity Rz (roughness factor) of Rz12.5 µm and this ensures optimum coating performance every time.

If you would like to discuss any specific shot blasting and / or coating project, or require a detailed quotation , please complete the form below, and we will respond immediately:

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• Specialist in surface preparation, coating application and finishing
• In-house and on-site teams anywhere in the UK
• Our operatives are fully trained in accordance with current legislation
• Worked on major coatings projects with clients such as BAA, Corus Bi-Steel, Royal Sun Alliance, City of Westminster and MoD.

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