Liquid Penetrant

Liquid Penetrant Testing (PT) involves the use of a fluorescent or brightly colored visible liquid applied to the surface of a test article to penetrate flaws open to the surface, then removing all excess liquid and applying a developer to cause any liquid trapped by a flaw to bleed and become visible identifying the presence and extent of possible flaws.  

Visible Dye or Fluorescent Dye

Visible Dye or Fluorescent Dye

Penetrant inspection is only useful for detecting flaws open to the surface, but is the most sensitive inspection method for surface flaws. Visible and fluorescent penetrant can be used depending on specification requirements. Penetrant removal is performed with either solvent dampened wipes or washed with controlled pressure/temperature water. Developer used to bring out any penetrant trapped by a surface irregularity is typically non-aqueous wet aerosol type developer.

As a Full Service NDT Provider

MQC Labs offers a wide variety of services along with exceptionally trained personnel that have helped us build a reputation as one of the best in the business.  Additionally, our cutting edge technology and unique capabilities have distinguished MQC Labs as the best option when selecting a Full Service NDT Provider.  For general inquiries, please fill out the contact form provided.  To contact a specific MQC Labs location, please refer to the contact information that is listed below for our Aberdeen and Beltsville offices.  We look forward to hearing from you.




Location 1550 S. Philadelphia Blvd, Aberdeen, MD 21001
Phone: 410.575.7295


Location 11593 Edmonston Rd Beltsville, MD 20705
Phone: 301.931.0590