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Aputty knife is a specialized tool used whenglazing single glazed windows, to workputty around the edges of each pane ofglass. Putty is often applied by hand, then smoothed with the knife. Moderninsulated glazing may use other ways of securing the glass to the window frame.
Aspackle knife (called ascraper inBritish English, also known as aspatula inAmerican English) is also commonly called a "putty knife", and is used for scraping surfaces or spreading material such asplaster in variousconstruction trades. Widths from 11⁄4" to 5" or 6" are commonly available.Wider-bladed knives up to about 12" are used forsheet rocking. Larger blades are made, but generally lack the stability of the smaller blades and do not make a perfectly flat surface.[1]
Stiff-blade knives, typically 1 mm or .040" thick, are suitable for scraping. Flexible-blade knives, typically 0.5 mm or .020" thick, are suitable for spreading. Due to the conductive nature of metallic blades, they should be kept at a safe distance from electrical components.
Disposable knives, with handle and blade molded as a single piece of plastic, are suitable for occasional jobs such as spreading roof patching tar or mixing two-part adhesives, avoiding laborious cleanup which may involve hazardous solvents.
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