Details

1. Step:

Precleaning with MR® Remover

The workpieces resp. the areas of the workpieces which are to be examined must be cleaned thoroughly: rust, scales and other contaminations must be removed with suitable tools, other contaminants (oils, greases, etc.) must be removed from the surface with MR® Remover. Before taking the next step the surface should be in a clean, dry condition, so that the penetrant can enter the surface discontinuities.

2. Step:

Application of MR® Penetrant red, MR® Penetrant red + fluorescent or MR® Penetrant fluorescent (waterwashable)

MR® Penetrant red or fluorescent can now be either sprayed or brushed onto the dry, grease-free workpiece; another possiblity of application is to immerse the workpiece into a penetrant bath. The recommended penetration time is usually between 5 and 30 minutes.

3. Step:

Removal of excess penetrant with MR® Remover or water

The excess penetrant can be removed either by rinsing with water, wiping with a special cloth (with or without MR® Remover) or spraying MR® Remover. The penetrant is to be removed thoroughly but without washing it out of the disconitniuities. Removal of a fluorescent penetrant must be checked by using UV-light. Allow surface to dry before taking the next step.

4. Step:

Application of MR® Developer

The most rational application of MR® Developer is by using aerosols, the developer film should be thin and even. Of course, a spray gun can also be used. After a drying time of 5-20 minutes possible discontinuities can be seen on the surface:

using the daylight procedure, red indications will appear on the surface; if using MR® Penetrant red + fluorescent the indications can additionally be viewed under UV-light

using the fluorescent procedure, fluorescent indications will appear under UV-light

The wider and deeper a discontinuity, the wider and more intensive the indication.

MR® Developer can be removed easily after inspection.

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