Non Destructive Testing // Developers
D-90G a dry developer used with fluorescent penetrants. It amplifies the location of cracks, pores, and similar flaws by multiplying fluorescent brilliance. D-90G also assists penetrant re-bleed back to the part surface and stabilizes indications. Complies with low sulfur, low halogen, and low sodium requirements.
• SAE AMS 2644
• QPL – Form D & E
• MIL-I-25135 Revisions E
• ASME Code NDT, Sec V
• Lockheed Martin
• Pratt & Whitney FPM
• General Electric
• Rolls Royce
• Northrup Grumman
|Appearance:||Fine White Powder|
1. Application: Apply fluorescent penetrant only to clean, dry surfaces by spraying, flowing, brushing or dipping.
2. Dwell Time: A 10-minute dwell time is suggested, although in many cases five minutes will suffice. When particularly tight cracks are suspected, or the part is especially critical, the dwell time may be extended to 30 minutes, or longer. Allow the penetrant to drain from the part surface back into the penetrant tank to conserve material.
3. Removal: Use the appropriate washing method to remove the excess penetrant from the surface.
4. Drying: A re-circulating oven set no higher than 1600F (710C) is suggested. Leave the part in the oven just long enough to evaporate surface moisture. Drying is improved by using pressurized air to disperse and remove as much excess water as possible before placing the part into the oven.
5. Developing: A dust chamber is a practical method for applying D-90G. D-90G can also be applied with electrostatic spray, low pressure spray wand, or a hand powder bulb. D90G may also be applied by immersing the part directly in the developer powder. (Never re-immerse the part in the developer as re-immersion can wipe away penetrant already drawn to the surface.) Shake or use very light air pressure to blow the excess D-90G powder from the surface. Allow a minimum of ten minutes. Developing time for especially critical inspections, lengthen the developing time.
6. Inspection: Inspect parts under appropriate UV-A light intensity and minimal visible light.