GUIDE to METHOD “A” (water washable) PROCESSING per ASTM E-1417-05 PRE-CLEAN SURFACE Part must be clean, dry and at a temperature of 4.4° -52°C (40° - 125°F) before penetrant is applied. Use Cee-Bee® # 210 or 300LF aqueous alkaline degreaser; immersion or spray application. Use Pen-Chek® E-59A, R-503 or R-504 solvent cleaners for spot inspection cleaning applications. APPLY Pen-Chek® TYPE I or TYPE II PENETRANTS (Method A) Use spray, immersion, or wipe on application. DWELL Wait a minimum of 10 minutes; 20 minutes if temperature is 4.4°-10°C (40-50°F). Reapply penetrant if dwell is over 2 hours to prevent drying out prior to removal.
WASH Water temperature 10°-38°C (50°-100 °F). Water pressure < 275kPa (< 40 psi); if a hydro-air nozzle use limit pressure to < 172kPa (<25 psi). Distance >30cm (>12 inches). Time- only long enough to remove surface fluorescence under UV-A or color under bright visible light.
DRY or APPLY AQUEOUS DEVELOPER (form c) Temperature <71 °C (<160 °F) Immersion, flow on, or spray. Time- only long enough to dry surface Pen-Chek D-78B
APPLY NONAQUEOUS (forms “d” or “e”) or DRY DRY DEVELOPER (form “a” Type I only) Temperature <71 °C (<160 °F) Pen-Chek® D-70 or D-72A (Type I only) Time- only long enough to dry surface
DWELL Wait a minimum of 10 minutes before inspection. Maximum time is 1 hour for forms “d & e” (nonaqueous), maximum 2 hours for form “c” (aqueous), and maximum 4 hours for form “a” (dry powder). If times are exceeded, clean part and reprocess.
INSPECT For fluorescent Type I penetrants use UV-A illumination of >1000 μw/cm2 @ 15inches (38.1 cm) in a darkened area of <21 lux visible light (<2 foot candles). For visible Type II penetrants use lighting of 1100 lux/m2 (100 footcandles) minimum. |