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DESCRIPTION
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CORRO-DUR
257 is formulated for
effective field application by brush, or roller at normal ambient
temperatures. The CORRO-DUR 257
formulation is based on the unique CORRO-DUR 258 resin system
which may be applied to damp or wet concrete surfaces and which
has been flexibilized with an inert proprietary plastic . This
resin system is toughened with Kevlar™* to give superior chip
resistance and is pigmented with select hard ingredients to
further enhance wear resistance.
The cured film is glossy with a slight texture resulting from
the fiber reinforcement. Related products have been employed
for underwater application and have been subjected to both radiation
and DBA testing with excellent results. The resin system used
has excellent resistance to commodities such as hydrocarbon
oils and fuels, mineral acids and alkalis
The solvent-free formulation avoids
the objectionable odor and explosion hazards of epoxy solvent.
Absence of solvent also assures compliance with all present
and proposed air pollution regulations and prevents common service
problems caused by shrinkage or water sensitivity of residual
entrained solvent residues.
*Kevlar is a trademark of E.I.
DuPont de Nemours Co.
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USES
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MARINE AND OFFSHORE PETROCHEMICAL
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Heavy duty maintenance
for decks, tanks etc.Anticorrosive for use under insulation
or on sweating surfaces. |
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POWER GENERATION FLOORING
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Ideal
for draft tubes, penstocks, waterboxes and tubesheets.Exc.
chemical and physical resistance flooring with or without
abrasive. |
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SECONDARY CONTAIMENT
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Easy to apply,
chemical and UV resistant lining. |
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APPEARANCE
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COLORS
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All colors available
including white ( slight yellowing ) |
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FINISH
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Gloss with slight
texture |
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PHYSICAL PROPERTIES
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VEHICLE TYPE
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Epoxy/
inert plasticizer/ propertary polyamines. |
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PIGMENTATION
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Color, fibrous
reinforcing, inert extender |
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THINNER
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Not required |
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CLEANER
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Lacquer thinner
or similar |
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MIXING RATIO
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2.0/1.0 ( Volume
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INDUCTION TIME
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Not required |
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POT LIFE
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Approx. 40 minutes/77°F
(25°C) |
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SOLIDS BY VOLUME
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100% |
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REC.DRY THICKNESS
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15-30mils ( .38-.76mm) |
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THEO. SPREAD RATE
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80sq.ft / gal.
@ 20mils ; 2 sq.m/l @ 5mm |
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DRY TIME (TOUCH)
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Approx. 5 Hrs /
77°F ( 25°C ) |
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DRY TIME (HARD)
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Approx. 15 Hrs
/ 77°F( 25°C ) Max. cure in 7 days |
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APPLICATION METHOD
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Roller, brush,
heated plural airless spray |
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FLEXIBILITY
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Approx. 25% elongation
at break |
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SHELF LIFE
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12 Months minimum |
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VOC
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Zero |
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SAFETY INFORMATION
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| STORAGE
CONDITIONS |
Normal |
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SURFACE
PREPARATION
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NEW CONCRETE
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Surfaces are best
prepared by abrasive blasting to roughen and remove the weak
surface laitance. When prepared properly the surface should
have the firm granular appearance of " medium" sandpaper.
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AGED CONCRETE |
Surfaces may be prepared by either high pressure water jetting
at sufficient pressure to remove all loose contamination and
yielding a firm. "medium" sandpaper finish. Worn concrete
in wastewater service may be prepared using only about 3,500
psi however, aged concrete which has never been in aggressive
service may require jetting with over 8,000 psi to achieve
the same result. Air abrasive blasting is also a satisfactory
method of preparation. If the concrete is extremely worn it
may be faired smooth before application of the CORRO-DUR
257 using CORRO-DUR 455 or CORRO-DUR 456 depending
on anticipated exposure. |
STEEL |
Surface is best prepared by air abrasive blasting to a "near-white
", (SA2.5 SSPCSP-10) CORRO-DUR 257
is extremely tolerant of compromised surfaces and will provide
excellent protection over tight rust or existing coating residues
in sound condition. The solvent-free formulation avoids softening
of underlying coatings, CORRO-DUR
257 may even be applied over Styrofoam™ without
softening it. |
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APPLICATION
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CORRO-DUR
257 is supplied in two
gallon (7.6liters) units. 1.33 gallons (5 liters) of epoxy base
are filled into a two gallon plastic pail and 0.67 gallons (2.51)
of curing agent are filled into a one gallon steel can to yield
a 2/1 mixing ratio. Stir the curing agent into the base preferably
using a mechanical mixer. Once mixing is complete, start application
immediately - CORRO-DUR 257
does not require a "sweat-in" or induction time. Potlife is
about 40 minutes at 77°F (25°C), small amounts of epoxy solvent
may be added if the mixture begins to thicken noticeably towards
the end of its working life. Apply CORRO-DUR
257 using brush, pad or roller in smaller areas or
with a heated, plural component airless spray on larger jobs.
Underwater application is best made using rollers or paint pads
after surface preparation by air/abrasive or high pressure water
blasting to remove loose surface contamination and marine biological
fouling.
Applications may be made in one full coat at the required millage
or may be made in multiple coats if necessary. Underwater applications
are best made in one heavy coat to avoid the complications of
biological settlement between coats. Above water it may be necessary
to "stripe coat" edges to ensure adequate coverage.
If airless plural spraying, the
following conditions are recommended :
| Ratio |
Base/Cure : 2.11/1.0
( Volume ) |
| Tip |
30 thous"-angle
to suit application |
| Cleaning Solvent |
MEK or standard
epoxy thinner |
| Fluid Temperature |
130°F ( 54°C
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| Fluid Pressure |
2,250psi |
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TEMPERATURE
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Temperature will exert a considerable
influence on the rate of curing of chemically cured coatings
such as CORRO-DUR 257. In
broad terms expect each 10°C, (18°F), rise or fall in temperature
to half or double dry times and pot lives.
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TRANSPORTATION
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USDOT, IATA & IMO "Non-Regulated
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