A-A-2954
3. SALIENT CHARACTERISTICS
3.1 Material.
3.1.1 Bristle, Class 1. The bristle shall be natural color, stiff, resilient hog bristles of uniform length, and shall be cleaned and sterilized. The bristles shall be trimmed so as to show no tendency to separate at the ends.
3.1.2 Synthetic filament, Class 2. The filament shall be made of synthetic polymeric amide. The filament shall be black or white in color, as specified in the contract or purchase order.
3.1.3 Wire. Wire shall be brass, zinc-coated steel or corrosion-resistant steel.
3.1.4 Wood. Wood for the handles shall be close-grained and straight –grained hardwood, such as birch, beach, maple, or ash.
3.2 Construction.
3.2.1 Style A – dome tip. The distal end of the brush part shall have a dome composed of several fan shaped wings of applicable filler, neatly and securely bound into the twisted wire.
3.2.2 Style B – tuft tip. The distal end of the brush part shall have a tuft composed of the applicable filler neatly and securely bound into the twisted wire.
3.2.3 Style C – conical tip. The brush head shall taper from the handle and toward the distal end and shall have a single fan shaped wing of applicable filler neatly and securely bound into the twisted wire.
3.2.4 Style D – single fan tip. The distal end of the brush part shall have a single fan shaped wing of applicable filler, neatly and securely bound into the twisted wire.
3.2.5 Style E – open end. The brush head shall be located equidistant from the ends. The handle end of the twisted wire shall have a loop and the other end of the wire shall be tightly twisted to a rounded, smooth end.
3.2.6 Ferrule. The metal ferrule shall be corrosion-resistant, approximately 5/8 inch (15.8 mm) wide, and clamped around the handle where the strip is inserted into the wooden handle.
3.3 Workmanship. The brushes shall function smoothly for the purpose intended. Handles shall be free of cracks or chips. No defects that affect appearance, function or serviceability shall be permitted.
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