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 Minimum net retention of active preservative1/
Form of product and
Penetration
Assay
Treating
service conditions
Zone
specifi-
cations2/
(AWPA C1
and
others
listed
below)
------------------------Pounds
per
cubic
foot--------------------------
In. and/or
In.
pct of
sapwood
Ties
Crossties, switch ties, and
C2 and
bridge ties
C6
--
--
--
--
--
85
Gage only
7.0 7.0 7.0 0.35
--
--
--
Beech, birch, and maple
--
--
--
--
--
--
--
--
----------Refusal----------
65 pct of
...do...
Red oak
rings
--
--
--
--
--
--
--
--
1.5 or 75 ...do...
10.0 10.0 10.0 0.50
Black and red gum
----------Refusal--------
Ash, black and honey
90
...do...
locust, hickory
black walnut, white oak,
and interior Douglas-fir
--
--
--
--
--
--
--
--
0.5 and 90 ...do...
8.0
8.0
8.0
0.40
Coastal Douglas-fir,
western hemlock,
and western larch
--
--
--
--
0.40 --
--
--
--
Southern and ponderosa pines 2.5 or 85 ...do...
8.0
8.0
8.0
--
--
--
--
--
0.5 or 90 ...do...
7.0
7.0
7.0
0.35 --
--
--
Jack, lodgepole, and
red pines
Timbers2/:
C2,Cl4
Solid
C16, and
For use in coastal waters
C18
In areas where Limnoria
tripunctata and pholads are
known to be active, or in
southern areas for which
information on the borer
hazard is lacking the dual
treatment shall be used
(see table III)
In areas where moderate to
heavy limnoria attack is
expected but pholads are
absent
--
Coastal Douglas Fir
0.75 and 90 0-0.60
--
--
2.50
2.50 --
--
--
--
--
--
--
--
Western hemlock
0.75 and 90 0-0.60
--
--
2.50 --
2.50
--
--
--
--
--
--
--
2.50 or 85 0-0.60
Southern Pine
--
--
2.50
2.50 --
--
--
--
--
--
--
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