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November/December 2008
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Prime Coat Defects on Welds and Edges: (top) White light inspection; (bottom) Fluorescent inspection

Luminance Ratio of Fluorescent Specimens

A request from the U.S. Navy was the impetus behind the development of a new ASTM International standard, E2630, Test Method for Luminance Ratio of a Fluorescent Specimen Using a Narrow Band Source. The new standard was developed by Subcommittee E12.05 on Fluorescence, part of ASTM International Committee E12 on Color and Appearance.

Richard Harold, consultant, Color and Appearance Consulting, LLC, and chair, Committee E12, says that the Navy was looking for improved visual inspection techniques to prevent corrosion on newly painted shipboard tanks. “The Navy needed a technically rigorous specification that multiple industries could reference to deliver products that would work together as a system for the specified application,” says Harold.

In addition to the Navy, E2630 will be useful to the U.S. Department of Transportation, the Federal Highway Administration, large shipowners and builders, paint companies that manufacture paint for corrosion control, and inspection flashlight manufacturers that comply with E2501, Specification for Light Source Products for Inspection of Fluorescent Coatings. Other potential users of E2630 include owners and operators of steel marine structures such as offshore oil rigs, the pipeline and petroleum oil tank industries, and municipal water tank owners.

A proposed standard that will specify coating systems to be used in conjunction with E2630 and E2501 is to be developed by a task group of Subcommittee D01.26 on Optical Properties, part of ASTM International Committee D01 on Paint and Related Coatings, Materials and Applications.

Participation in Subcommittee E12.05 from paint and flashlight companies and suppliers, asset owners and other interested parties is welcome.

CONTACT

Technical Information: Richard Harold, Color and Appearance Consulting, LLC, Herndon, Va.

Phone: 571-926-9434

ASTM Staff: Thomas O’Toole

Phone: 610-832-9739