MIL-DTL-2427H (AR)
4.4.5 Presence of PQ56 (copper -8-quinolinolate) preservative.
4.4.5.1 Primary method.
4.4.5.1.1 Materials and equipment. The materials and equipment required are as
follows:
a. PQ Check ( indicator): The formulation contains 10 parts by weight, of
sodium diethyldithiocarbamate trihydrate (see 6.10) and 90 parts by weight of distilled
water.
b. Dropper: An ordinary glass tube eye dropper may be used.
4.4.5.1.2 Test procedure. Two drops of PQ Check (indicator) shall be applied to
the wood surface. An immediate dark brown coloration and the spreading of the drops
shall indicate PQ56 treatment.
4.4.6 Presence of M-GARD W550 (zinc naphthenate emulsifiable) preservative.
4.4.6.1 Materials and equipment. The materials and equipment required are as
follows:
a. Reagent. Dissolve 0.1 grams of dithizone (diphenylthiocarbazone) (see 6.11) in
either 100 ml of methyl ethyl ketone or 100 ml of chloroform (Note: This solution may
be stored for long periods of time.)
b. Eye dropper. An ordinary glass tube eyedropper may be used.
4.4.6.2 Test procedure. Five drops of the solution shall be applied to the wood
surface. The indicator turns red when zinc (M-GARD W550) is present. The color green
indicates that the preservative is not present. Both colors fade quickly in the presence of
light.
4.4.7 Presence of M-GARD W510 (copper naphthenate emulsifiable) or Cunapsol
5 (copper naphthenate) preservative. The materials and equipment required are as
follows:
a. Reagent. Disolve 0.5 grams chrome azurol "s" concentrate (see 6.11) and 5.0
grams sodium acetate in 80 ml of distilled water and then dilute further to 500 ml total
with distilled water.
b. Sprayer. A common manual (fly) type applicator shall be used.
4.4.7.1 Test procedure. Spray the solution over the surface of dried treated wood.
A deep blue color reveals the presence of copper (from copper naphthenate)
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