Magnavis 7HF Black Visible Magnetic Particle Wet Method Prepared Bath is designed for spot inspections of parts that, because of their size or location, must be inspected in the field.
Magnavis 7HF is composed of 7C Black Magnaflux magnetic powder suspended in a low volatility mineral oil. It offers significant advantages in situations where bulk processing is found to be impractical and is often used in combination with WCP-2 White Contrast Paint. Magnavis 7HF is ideal for remote inspection of tubes, piping, and other large structures.
|Product Data Sheet||Safety Data Sheet|
Method of Use
Components should be cleaned prior to testing to provide a suitable test surface. The ink can be applied by spraying, immersion or flooding.
The ink must be mixed thoroughly prior to use and must be kept agitated during testing.
-Using the wet continuous method, the ink is applied to all surfaces of the component during magnetization. The indications will be formed during the application of magnetising current. The flow of ink must be stopped before the magnetising current is switched off, otherwise there is a risk that the force of the ink application may wash away indications.
-Using the wet residual method, the premagnetised part is immersed in the bath, removed, allowed to drain and then inspected. This method is generally less sensitive than the continuous method and is more susceptible to rapid particle depletion and bath contamination.
In situations where the test surface colour is dark, a thin coating of a suitable white contrast paint such as Magnaflux WCP-2, may be applied prior to testing to provide a contrasting background.