Product Overview

Dura-Green
™
and Dura-Copper
™
Epoxy Coatings
Dura-Green and Dura-Copper epoxy
coatings are water borne epoxy coatings
applied to Cooper B-Line products by a
precisely controlled cathodic electro-
deposition process. This process is
accomplished using a conveyor to
transport channel and fittings through
several cleaning, phosphatizing and
application stages prior to being baked
(See diagram below).
This custom-designed paint system is
used for painting all channels, channel
combinations, slotted angle, and fittings.
Samples are selected on a routine basis
for Salt Spray (fog) testing to verify the
quality of the finish. These tests are per-
formed in accordance with ASTM B117
and evaluated and related according to
ASTM D1654 (Tables 1 & 2).
The Dura-Green and Dura-Copper Epoxy
coatings have been tested and listed by
Underwriters Laboratories in accordance
with “Standard for Surface Metal Raceway
and Fittings, UL5” and “Standard for Pipe
Hanger Equipment for Fire Protection
Service, UL203”.
Due to Dura-Green’
s organically based
composition, it seats itself into porous
surfaces more completely and efficiently
than zinc coatings. As these porous
caverns are filled along the material
profile, the outer finished surface
demonstrates an increased smooth
uniform plane which produces
considerably less off-gasing when tested.
Cooper B-Line’s Dura-Green channel
meets or exceeds 100 level clean room
standards. This was confirmed by testing
the channel in accordance with Boeing
(PCL) Standards, which are more strin-
gent and complete than ASTM E595-93.
Dura-Green was found to be a superior
finish, due in part to its proven application
process.
PVC Coating
Another of the corrosion resistant coatings
offered by Cooper B-Line is PVC
(polyvinyl chloride), applied over steel or
aluminum channel and fittings. The PVC
coating process begins by cleaning the
product thoroughly. A bonding coat is
applied to the part and then preheated to
a temperature above the melting point of
the coating powder. The product is then
passed through a fluidized bed of vinyl
plastic powder where the powder
particles melt, adhere and flow out to
form a smooth continuous coating.
The
thickness is controlled by the base metal
temperature and the immersion time in
the bed. It is then post-heated to complete
the fusion of the outer surfaces.
The standard coating thickness of
Cooper B-Line’s PVC coated products is
15 mils (.380 mm), plus or minus 5 mils
(.125 mm). Since the chemistry, not the
thickness of vinyl plastic PVC determines
longevity, a coating of 10 to 20 mils (.250
to .500 mm) is more than adequate. If the
corrosive conditions are such that the
plasticizers are leeched out, a thicker
coating will do little to extend the life of a
coated product.
For certain environments, a plastisol
dipped PVC coating is available on
request.
PVC coating depends totally on the
concept of encapsulation attached to the
base metal by a bonding agent. If any
hole or discontinuity occurs, the corrosive
action can undercut the base metal to a
point where all that remains is the PVC.
In the event of field cuts or any other
damage to the coating, a liquid PVC
patch, available from Cooper B-Line, must
be applied to maintain the integrity of the
coating. After the installation is complete,
a thorough inspection should be per-
formed to assure the absence of voids,
pinholes, or cuts.
˛ Unscribed Scribed
1
/
8
” (3.2) Creepage
Type of Finish 5% Failure (1) from Scribe (1)
B-Line Dura-Green Epoxy 1000 Hours 312 Hours
Mill Galv. (Pre-Galv.) G90 192 Hours 288 Hours
Perma-Green 438 Hours 231 Hours
Zinc Chromate 36 Hours 96 Hours
Industry Green (Range) 10 to 36 Hours 4 to 30 Hours
SALT SPRAY TEST RESULTS
DURA-GREEN
™
/DURA-COPPER
™
EPOXY COATING PROCESS
TANK 1 TANK 2 TANK 3 TANK 4 TANK 5 TANK 6 TANK 7 TANK 8 BAKE OVEN
The channel A rinse is A phosphatized The material A pre-deionized The electro- The first post The final rinse The curing
and parts are
applied to
sealer is applied moves through rinse prepares coating tank rinse removes insures a process takes 20
thoroughly remove to insure clear water rinse the metal for the applies a any unelectri- smooth, minutes at a
cleaned and
insoluble salts
corrosion
to remove excess
cathodic electro-
uniform coat
cally attracted nonblemish baking temperature
phosphatized. and unreacted resistanceand phosphates. coating. of epoxy paint solids. surface. of 375° F (199° C).
phosphates. paint adhesion. to the entire
surface.
(1) All salt spray (fog) tests conducted in accordance with ASTM B117 and evaluated and
rated according to ASTM D1654 Tables 1 & 2. Tests are performed and certified by an
independent testing laboratory.
Technical Data
Technical Data
6