Blasting Overview

To present a clean and perfect *profile for bonding both wet coat paints, intumescents and dry thermal spray metal finishes, it is vitally important that all substrates are first cleaned and blasted to remove any pre-existing protective coating and corrosion.

All large item, aluminum oxide blasting, takes place in our dedicated  workshop # 2 with it's state of the art ventilation and grit recovery systems. Multi media blasting, glass bead, garnet etc, is carried out in Blast Room #10.

Please feel free to contact us about your blasting requirements. No job's too small.

*The blast dwell time or number of sweeps to which the substrate is subjected.

Preparation of steel substrates before application of paints, thermal coatings and related products — Visual assessment of surface cleanliness.

The Four Rust Grades as defined by ISO 8501-1

Grade A

Surface mostly covered with adherent mill scale, with little or no rust.

Grade B

Mill scale has begun to flake, rust has started to form.

Grade C

Mill scale has rusted away or can be scraped off easily and slight pitting has taken place.

Grade D

Mill scale has rusted away and general pitting can be seen with naked eye.

Four Visual Grades of Cleanliness after Blasting as defined by ISO 8501 - Based on Grade D Surface Rust.

SA 1 - Brush Off

Loose mill scale, loose rust and foreign
particles are removed.

SA 2 - Commercial

Mill scale, rust and foreign particles are
substantially removed and grey metal is visible.

SA 2.5 - Near White Metal

Mill scale, rust and foreign particles are removed to the extent that only traces remain in the form of spots or stripes. The cleaned surface will show varying shades of grey.

SA 3 - White Metal

Visible mill scale, rust and foreign particles are entirely removed. The cleaned surface should have a uniform metallic colour but may show varying shades of grey when viewed at different angles.

Loosely-adhering material: 0%
Tightly-adhering material: 100%
Stains, streaks, shadows: 100%

Loosely-adhering material: 0%
Tightly-adhering material: 0%
Stains, streaks, shadows: 33%

Loosely-adhering material: 0%
Tightly-adhering material: 0%
Stains, streaks, shadows: 15%

Loosely-adhering material: 0%
Tightly-adhering material: 0%
Stains, streaks, shadows: 0%

Grit Blasting

Our preferred universal blast media, is commercial grade aluminium oxide, an inert abrasive, which achieves the full range of blast profiles including *SA1, SA2, SA2.5 and SA3,  on all substrates including stainless steel and duplex for both wet and thermal spray metal coatings. 
By controlling the air and feed settings at the pot, our skilled blast operatives can accurately and without surface damage, remove coatings and surface deposits from many of the more sensitive surfaces. Please contact Lee, for further information on this subject.

*Used to determine the blasting standards on the 4 Rust Grades A,B.C & D for ISO 8501-1.

Bead Blasting

Bead blasting is the process of removing surface deposits by applying fine glass beads at high pressure without damaging the surface.  It is mainly used on vehicle body panels to remove paint in order to reveal damage caused by rust . In the case of auto body work, the bead blasting media is generally preferred over grit, as grit blasting tends to create a greater surface profile.

Bead blasting is often used to create a uniform polished surface finish on machined parts. 

Garnet Blasting

Garnet was generally considered a more environmentally-friendly alternative to similar abrasive blast media and mainly implemented on or around open bodies of water.

Please contact Lee or Jamie, with your Garnet media blasting requirements.

Aluminium Oxide

Glass Bead