Accession Number : AD0668837

Title :   FLUORESCENCE MICROSCOPY FOR DETECTING ADHESIVES ON FRACTURE SURFACES.

Descriptive Note : Forest service research note,

Corporate Author : FOREST PRODUCTS LAB MADISON WIS

Personal Author(s) : Quirk,John T.

Report Date : APR 1968

Pagination or Media Count : 2

Abstract : When wood-adhesive joints fail it is sometimes difficult or almost impossible to judge whether failure is in adhesion or in cohesion. Failure in adhesion implies separation between the adhesive film and the wood substrate. Failure in cohesion implies that separation occurs within the wood specimen or within the glue film; thus it is necessary to assess the location and type of failure. It is particularly important to be able to detect the presence of very thin films of adhesive on the wood surface. Several survey methods using a compound research microscope and various staining techniques were investigated to select an applicable method for detecting these films. Fluorescence microscopy utilizing ultraviolet (UV) radiation proved to be the fastest and most efficient way of examining surfaces for location of fracture. (Author)

Descriptors :   (*WOOD, *BONDED JOINTS), (*ADHESIVES, PHOTOMICROGRAPHY), FRACTURE(MECHANICS), SURFACE PROPERTIES, FILMS, DETECTION, FLUORESCENCE, ULTRAVIOLET RADIATION, PHOTOGRAPHIC FILM, PHOTOMICROGRAPHY, FAILURE(MECHANICS), COMPRESSIVE PROPERTIES

Subject Categories : Adhesives, Seals and Binders
      Wood, Paper and Related Forestry Products
      Couplers, Fasteners, and Joints

Distribution Statement : APPROVED FOR PUBLIC RELEASE