Contracor SFG-Type [6/36] General description

CONTRACOR

Version 1.0

3. General Description

The CONTRACOR SFG GUN is a suction blast tool ideally suited to small jobs or locations with

limited air supplies. Thanks to its light weight and compact dimensions, the CONTRACOR SFG

GUN can be used in places where erecting a conventional pressure blast machine would be

awkward or inconvenient e.g. mechanical workshops, car restoration, etc..

The SFG GUN can be used with all common blast media (see §2.2) to clean or etch metal,

glass, stone or other hardwearing surfaces. To operate the SFG Gun, just connect it to a

compressed air source, and ll blast media into the portable container.

To commence blasting, simply depress the lever on the SFG Gun. The tool operates according

to Bernoulli's principle, where a low-pressure area is created by the compressed air rushing

past the abrasive-injection point, where the abrasive hose is connected to the gun. This low-

pressure area draws abrasive into the airstream, where mixing takes place. The air-abrasive

mix is then exhausted out of the gun and strikes the blasting surface.

4. Compressed Air and Abrasive

4.1 Compressed Air Requirements

The table below shows approximate air consumption (m

/min) at various pressures (bar)

for the power gun alone.

Table 4.1 Air consumption in m

/min

bar 3 4 5 6 7

/min 0,58 0,72 0,87 1,01 1,15

4.2 Abrasive

Abrasive Size: The POWER GUN utilizes common abrasives that are 1.0 mm and ner.

Limited air supply, low blast pressure, or heavy abrasive may limit abrasive to smaller sizes.

Use only abrasives specically manufactured for blast cleaning, that are compatible with

the surface being blasted. Abrasive produced for other applications may be inconsistent

in size and shape, and produce an unsatisfactory nish. Some abrasive may contain salts,

corrosives, or other materials that could contaminate the surface being blasted.