BGAS Painting Study Material Chapter 2 continuation

Profile

Surface profile, Anchor pattern, key, Peak to trough height and Amplitude are all expression meaning the cross section of a blasted area, as measured from the top of the peaks to the bottom of the troughs.  The surface profile requirements are given on the specification for the job, e.g. for B. Gas 30 – 75 microns.

Shot blasted profile

Figure 2.1 Terms relating to preparing surfaces

Grit blasted profile 

Figure 2.2 Grit blasted profile

*Hackle – A small surface lamination, which stands upright like a needle after blasting.  Approximately ≤ 13 mm.  Easily removed.

*Lamination (slivers) – Appears to be a longitudinal ‘crack’, one lip curling back, any laminations found must be referred to engineer for ultrasonic check.

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