Process 2: Dry Blast - matt finish usually for paint preparation

This process uses particles (usually fine smooth glass beads) in a jet of compressed air. This leaves a slightly matt finish that will finger mark and corrode readily. Usually used for components to be painted, but also used for general cleaning of ferrous items. Casting defects can be revealed. Heavily corroded items may need the use of abrasive grades rather than smooth glass beads.

Stage 1: Pre-soak and pressure wash if there’s loose dirt, grease or other adherents. Dismantle components if required.

Stage 2: If components with oilways or other passages – blow through with compressed air. Option for ultrasonic washing to clean interior of passages. Plug holes with hard rubber taper plugs and if necessary mask areas (abrasive particles occasionally can penetrate).

Stage 3: Dry blasting with mildest media appropriate for the job. Smooth glass bead gives a burnished or slightly matt finish depending on the type of metal being cleaned. Light to medium non-metallic grits result in a matt finish to all metals. Light to medium iron grits (used for heavy contamination) leave a progressively matter finish on ferrous items that are to be painted. Casting defects can be revealed with any type of media.

Stage 4: Blow-over with compressed air to remove as much grit or dust as possible.

Stage 5: Pack in heavy gauge polythene bag with silica-gel sachet to inhibit corrosion prior to painting.

Many customers want a ‘best possible’ job, but others do not require this standard which will reduce the cost. For advice or other processes and services available, please phone John on 020 8766 7164 or e-mail john@icmhome.org.uk.