A-A-55555A
2.3 Corrosion-resistant. Corrosion-resistant metal for this application is defined as any metal that is
inherently corrosion-resistant to powdered or granulated pesticides. Zinc-coated steel conforming to
ASTM A 924/A 924M, ASTM A 653/A 653M, or tin-plated steel shall be considered corrosion-
resistant metal. Non-metallic materials shall be compatible with all materials or chemicals for which they
are subject to come into contact with and shall not deteriorate during normal operation. Cadmium is not
acceptable for Government procurements.
2.4 Threads. All threads shall conform to FED-STD-H28.
2.5 Surface finish. Unless otherwise specified (see 6.3(b)), the finish and color shall be the contractor's
option.
2.6 Duster. The product shall consist of an air pump cylinder provided with a plunger assembly, a
metal operating rod (1/4 inch (.635cm) minimum diameter, provided with a hand grip comfortable to the
hand), exhaust valve, exhaust chamber, a powder container, discharge tube, and nozzle (see figure 1).
Figure 1. Duster, manually-operated tubular pump
with integral powder container.
2.7 Pump and exhaust chamber. Body seams, if any, shall be as strong structurally as the body
material. The inside of the pump cylinder shall be smooth. The exhaust chamber valve shall prevent
pesticide powder from entering into the pump cylinder. The pump and plunger assembly, when
activated, shall produce a sharp blast through the exhaust chamber causing a dust laden air stream to
flow through and out of the discharge tube and nozzle.
2.8 Pesticide container. The powder container shall have a minimum powder capacity of one quart
(.96 liter) or one liter liquid measure. The powder container shall have a screw cap filler opening. All
sections of the powder container, except the discharge opening, shall be airtight.
2.9 Discharge tube and nozzle. The discharge tube and nozzle shall be as normally furnished by the
manufacturer for dusters of this type, providing they are suitable for dusting operations herein specified
(see 1). The discharge tube and nozzle shall be constructed of a corrosion-resistant material and shall
have friction-type joints, screw thread joints or similar connections whereby they can be easily
disassembled. The tube and nozzle shall not become disengaged while in operation.
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