Ardrox 9D4A Dry Powder Developer Ardrox| Ardrox 9D4A Dry Powder Developer Print Ardrox| Ardrox 9D4A Dry Powder Developer Free-flowing white high purity fluffy powder used as a dry powder developer for Ardrox penetrant inspection. It forms a thin film on parts, which enables it to enhance indications of ultra-fine discontinuities. 9D4A-5: Ardrox 9D4A, 25lb (11.3kg) pail. 9D4A-6: Ardrox 9D4A, 10lb (5.0kg) pail. Request for information