DESCRIPTION

CORRO-DUR 458 was formulated to provide thermal insulation and corrosion protection of steel surfaces in aggressive environments. It is formulated from a unique combination of a chemical resistant, extremely tough resin and a high loading of an inorganic, thermally insulating pigment. The mixed system has a high build pasty viscosity which is easily applied by trowel or spatula to thickness in excess of 1" (2.5cm) on vertical surfaces. Very thick applications with no effective maximum thickness are easily attained in multiple applications. Damages sustained in service are easily repaired by troweling fresh CORRO-DUR 458.

The cured surface is smooth and essentially non-porous. Underlying metal surfaces are perfectly protected against aggressive Marine or Industrial exposures by the heavy, impermeable CORRO-DUR 458 coating. The common problem of Corrosion Under Insulation (CUI), is avoided by the intimate bonding of the CORRO-DUR 458 which is unlike the more porous fiberglass or mineral wool type insulation that can hold moist electrolytes against the insulated surfaces.

The formulation is solvent-free to avoid the odor and explosion hazards of epoxy solvents. Absence of solvents also assures compliance with all present and proposed air pollution regulations. The cured surfaces may be sanded, carved or painted with any paint for cosmetic effect.

USES

APPEARANCE

PHYSICAL PROPERTIES

SAFETY INFORMATION

SURFACE PREPARATION

The surface to be insulated should be intact and free from loose corrosion or other deposits. CORRO-DUR 458 is compatible with all primers - if applied over aged, smooth epoxy base coats, abrade the surface to ensure an adequate 'tooth' for bonding. The CORRO-DUR 458 layer itself is aggressive Marine or Industrial atmospheres.

APPLICATION

CORRO-DUR 458 is supplied in three components of epoxy base, curing agent and glass micropheres. This three component mixture yields a tough, water resistant and effective thermal insulating barrier. Unlike porous or spun inorganic insulating materials CORRO-DUR 458 will not absorb moisture to cause corrosion under insulation (CUI) commonly seen with these materials. First pour 1 can of epoxy base and 1 can of curing agent into a clean 5 gallon or 20 liter pail. Mix these resins together using a ½" (1.3 cm) "Jiffy" type mixer to yield 1.75 US gallons (6.6 liter) of special binder. Immediately after the resin mixing, pour in microspheres and mix using the Jiffy mixer, incremental additions of the microspheres will mix more quickly than a few large additions. (NOTE: The mixing area should be free of air drafts as the microspheres float easily in any air currents.) Each unit will require the volume of 4.65US gallons (17.6 L). During the microsphere addition the viscosity of the mixture will increase

Using broad, straight - edged spreaders lift the mixed CORRO-DUR 458 from the pail and transfer to the tank surface. A 'buttering' motion will lay down an even coating at the thickness desired up to about 1" (2.5cm) thickness. Check thickness by stabbing with a marked rod or knife to ensure desired thickness is being attained. Additional applications may be made after underlaying layers have cured to a firm consistency.

The cured CORRO-DUR 458 hard insulation coating may be painted with any generic type of paint or further insulated using other insulating media. If repairs should be required as a result of mechanical damage, these may be effected by shaving back to intact material then applying fresh CORRO-DUR 458 to fill in the lost volume.

The optimum mixture is as smooth, slightly 'dry' in appearance rather that wet and sloppy, and will apply easily to a thickness of about 1" (2.5 cm) on vertical surfaces.

TEMPERATURE

Thermal Conductivity has been measured as follows :

Dry : 0.065 BTU-ft / ( ft2.hr.°F ) ASTME-1530
Saturated ( 7 days ) 0.065 BTU-ft / ( ft2. hr.°F ) ASTME-1530

TRANSPORTATION

USDOT, IATA & IMO "Non-Regulated"