MARINE COAT

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MarineCoat

Description

ASTEK MarineCoat is a three component water based coating containing an acrylic liquid blend, Portland cement and fine silica sand. The system has a 30 year product history in salt and fresh water applcations worldwide. Currently MarineCoat is being applied exclusively by Robinson Contracting Services.

Uses

ASTEK Marine Coatings are used for the corrosion protection of steel structures in a sea or fresh water or salt spray environment such as:

•- bridge decks

•- ship decks

•- drilling platforms

•- sea walls of sheet piling

•- structural steel members with large surface areas

•- potable water and ballast tanks for ships

•- interior and exterior surfaces of water towers

•- lighthouses

•- floating dry docks

•- above grade and subgrade tanks and pipes and other steel structures

When exposed to traffic apply a wear resistant MarineCoat topping as follows:

•- occasional pedestrian and vehicular traffic (1.5 mm thick topping)

•- heavy pedestrian and light vehicular traffic (3.0 mm thick topping)

•- heavy vehicular traffic (6.0 mm thick topping)

Features

•- bonds well to properly prepared steel surfaces and does not require painting

•- provides an alkaline coating which passivates the steel preventing corrosion.

•- minor holidays in the coating do not prevent the passivation of the steel

•- reduces construction delays: construction, welding and coating operations can proceed simultaneously

•- allows trapped vapors to escape thereby preventing blistering of the coating

•- provides a non-dusting, water shedding surface

•- is not affected by ultra violet light

•- is not affected by chemicals ranging from mild acids to strong bases

•- does not affect the health of workmen

•- is non-flammable

•- does not release toxic gases

•- most properties improve with age

Textures and Colors

Textures vary from rough broom to textured paint finish depending on the roughness of the subsurface and method of application.

Standard colors are cement gray and white. Custom colours can usually be matched

Limitations

Deteriorates in the presence of strong acids. Softens in some solvents such as acetone, ketone, toluene and xylene and rehardens upon evaporation of the solvents.

Should not be applied to surfaces with temperatures below 10^oC (50^oF) or 5^{o_{C when using the cold weather LB148 polymer}}.

Softens in boiling water.

Surface Preparation

Correct surface preparation is important for the performance of coating. Surfaces shall be clean of loose scale, poorly bonded coatings, oil, grease and other deleterious substances.

American National Standard Institute ANSI A 159.1-1972 standard "Surface Preparation Specifications" shall be followed. A copy can be obtained from Steel Structures Painting Council, 4400 Fifth Avenue, Pittsburgh, Pa. 15213, U.S.A.

Method of Application

The component materials (the liquid blend, Portland cement and fine silica sand filler) are mixed at site with paddle type mixers to form a slurry of creamy, thick paint consistency. The pot life varies from 1 to 4 hours depending on air temperature and relative humidity.

Air operated gravity feed type hopper guns or spray systems, brooms, brushes or rollers are recommended for application.

MarineCoat is applied in two coats.

Curing

Air cure for 12 to 72 hours depending on ambient temperature, relative humidity and wind velocity. Cure coating for a minimum of 72 hours when subject to continuous water exposure. When ambient conditions result in rapid removal of water from the system apply one coat of ASTEK sealer curing compound.

ASTEK MarineCoat Technical Data

Properties Standard MarineCoat

Physical

Thickness 0.8 – 1.0 mm (32-36 mils)

Wet Density ASTM C905 1990 kg/cu.m. (124 lb./cu.ft.)

Solids Content 87%

Physio-Chemical

Freeze-thaw resistance 400 cycles

Wetting and drying No damage

Chemical

Alkalis Excellent

Chlorides & Sulphates ASTM C672 Excellent

Weak Acids pH >4.5 Good

Strong Acids pH <4.5 Poor

Solvents Poor

Salt Spray Test (after 1400 hours exposure)

Loss of adhesion None

Blistering None

Rust Bleed None

Under Film Corrosion None

Mechanical

Adhesion Strength – Elcometer adhesion tester

20 degrees C dry 2.7 MPa (400psi)

wet (7 day immersion) 1.4 MPa (200 psi)

100 degrees C dry 3.0 MPa (440 psi)

Wet (7 day immersion) 0.0 MPa (0 psi)

Impact Resistance ASTM G14 Modified 18 joules (160 in.lbs.)

Abrasion Resistance High

Hygroscopic

Water Absorption

Immersion 0.7%

Boiling 2.5%

Water Immersion

1200 hrs. @ 21 degrees C no damage

Thermal

Coefficient of Thermal Expansion ASTM C531 0.000011 cm/cm/degrees C

(0.000006 in/in/degrees F)

Heat Resistant in Dry Condition up to 200 degrees C (392 degrees F)

Fire

Smoke Density Index ASTM E286 0

Flame Spread Index ASTM E286 0

Fuel Contribution Index ASTM E286 5