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Penetrant Nomenclature and Sensitivity Levels (SL)	Conforms to Specifications: MIL-I-25135, DTD-929, ASTM E-165	Type of Developers recommended for use	Typical Applications	Packing
23 FP SL-1/2 to 1 Crack detectability 30 micron on Ni-Cr Panels.	Low sensitivity Type I, Method A	ORION 28D ORION 22D ORION 21D ORION 115D ORION 119D	General purpose for forgings, castings and similar less critical components. Low water tolerance.	5 & 20 Litres
23 FP (HS) SL-2 Crack detectability 20 micron on Ni-Cr Panels.	Medium sensitivity Type I, Method A	ORION 28D ORION 28D2 ORION 22D ORION 21D ORION 119D ORION 115D	General purpose, medium sensitivity for precision castings, forgings, aircraft and aero space components.	280/400 ml 5/20 Litres
23 FP₂ SL-3 Crack detectability 10 micron on Ni-Cr Panels.	High sensitivity Type I, Method A	ORION 28D2 ORION 22D ORION 21D ORION 119D	High sensitivity recommended for use on highly stressed rotating parts of Gas Turbine Engines & similar applications.	5 & 20 Litres
23 FP₃ SL-4 Crack detectability 5 micron on Ni-Cr Panels.	Ultra-high sensitivity Type I, Method A	ORION 28D3 ORION 22D ORION 21D ORION 119D	Ultra-High sensitivity and is recommended for extremely critical applications, wherever maximum sensitivity is required.	5 & 20 Litres
23 FP₂ SL-3	High sensitivity Type I, Method A	ORION 28D2 ORION 22D ORION 119D	Similar version of 23 FP2 in aerosol can.	280 ml 400 ml