Choosing Fluorescent (Type 1) Water Washable (Method A) Penetrants
Water washable penetrants are the most widely used for general metal working and even low stress component aerospace applications. Water washable penetrants are composed of water washable ingrediants. The penetrant covered part is simply washed after the prescribed penetration dwell time. Being water washable, excessive wash time or pressure must be avoided with Method "A" penetrants, to avoid washing the penetrant out of shallow open discontinuities.
The FBP-911, FBP-912, FBP-913 and FBP-914 series covers sensitivity levels 1-4 and was designed to be the most environmentally friendly possible. This series does not contain fats, oils or greases (FOGs) and is free of any volatile organic compounds (VOCs). The constituents are considered biodegradeable. This series is smooth washing, non-gel forming and will wash cleanly from rough surfaces.
The FP-921, FP-922 and FP-923 series cover sensitivity levels 1-3. These materials are bright yellow green fluorescent penetrants that are smooth washing, with controlled removal without gelling. They have low viscosities, which aids in spraying and reduced drag out in immersion applications. The materials use biodegradeable surfactants. They are approved by GE, Pratt & Whitney and Rolls Royce for non-rotating turbine engine component inspection. Widely used for investment casting inspection and general industrial applications.
