WHITE PAPER Figure 4c. Scanning electron microscope image showing the gap between the brush block and the bristles. Figure 5a. Drilled and stapled brush after cleaning. UV lotion trapped in the drilled holes. Figure 4d. Scanning electron microscope image showing the gaps between the bristles, and the depth that these gaps extend to within the brush block. Figures 5a and 5b show the location of UV lotion (contamination) after the drilled and stapled brush had been cleaned. Figure 5a shows UV lotion trapped between the brush block and the bristles in the drilled holes. Figure 5b shows a cross-section of one of the drilled holes revealing residual UV lotion lining the hole within the brush block. Drilled hole depth approximately 10 mm. Figure 5b. Vertical cross-section of a drilled hole containing residual UV lotion after brush cleaning. Resin set brushware Resin set brushware is constructed by setting bundles of bristles into a liquid epoxy resin. The resin is usually formed by mixing two component chemicals that then react to cause the resin to set. The mixed liquid resin is poured into a well in the brush head and the bristles are then inserted and held in position until the resin has set. Figure 6a shows the resin set brush sample and the potential contamination traps created by the ridges and wells of the brush construction. Figure 6b shows a vertical cross-section of the resin set brush showing the way the bristles are fixed into the resin and how the resin sits within the hollowed out brush block. Vikan A/S - Department of Research & Development © Vikan A/S. Published, 2015. Revised, 2023 05
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