Page 64: of Maritime Reporter Magazine (February 1992)

COATINGS (continued from page 63) abrasive applications.

Through its Australian joint ven- ture, Barton produces GMS garnet blast media for worldwide marine and petrochemical markets. Barton reports that GMA garnet is a cost effective replacement for silica sand and mineral slags materials and for aluminum oxide.

The GMA material is noted for high levels of productivity with mini- mal levels of dust generation. Higher initial costs are offset by reduced materials requirements, reduced disposal costs, and reduced environ- mental impact and liability. GMA

Garnet (along with Barton's 1640 material mined in New York) is said to be the only natural mineral abra- sive clean enough to earn a position on the U.S. Navy's QPL-22262 for blast media.

Barton says users of GMA garnet blasting media are assured the high- est quality surface preparation to- gether with the lowest level of envi- ronmental and safety risk.

CARBOLINE

Circle 58 on Reader Service Card

To provide long-term corrosion protection to the mile-long array of interconnected steel platforms and bridges thatform the world's largest offshore mining development, Free- port-McMoRan Inc., recently se- lected a three-stage coating system supplied by Carboline, St. Louis, Mo., comprised of a zinc primer with an epoxy mid-coat and a polyurethane topcoat. The coating was applied to all exposed steel surfaces—from the top of the 340-foot-high sulfur-min- ing production platforms to the mudline, more than 200 feet below the surface of the Gulf of Mexico.

Mitch Braun, marketing services manager for Carboline, said: "Be- cause the steel structures of the huge mining complex will be continually exposed to salt air, seawater and sulfur, Freeport-McMoRan needed a tough, durable coating system that could provide outstanding, long- term corrosion protection. Our Carbo

Zinc 11 primer over-coated with Car- boline 890 epoxy and Carboline 134 polyurethane offered the ideal solu- tion for the tough coating project."

Carbo Zinc 11 is an inorganic zinc primer coat that protects steel gal- vanically to eliminate sub-film cor- rosion.

Carboline 890, based on a high- performance Ciba-Geigy epoxy resin, is a two-component, high-solids, high-build coating.

Carboline 134 polyurethane is a two-component coating designed to produce a glossy, smooth, hard-film surface finish.

CHESAPEAKE

SPECIALTY

Circle 56 on Reader Service Card

In early July 1991, the U.S. Navy conducted a deck blasting test com- paring the cleaning effectiveness of

Chesapeake Specialty Products'

METgrain steel abrasive with con- ventional steel shot. Chesapeake

Specialty Products' METgrain steel abrasive was found to be more effec- tive in removing deck coatings and underlying corrosion than conven- tional steel shot. The unique, ir- regular shape of METgrain particle combines peening energy to remove the coatings with a scouring action to remove rust scale. A side benefit of METgrain is that because it is an irregular rounded particle rather than a sharply angular grit, MET- grain does not cause excessive wear on the deck blast units.

The deck blast machine used for the test requires that the abrasive ricochet off the deck and into the blaster's recovery and recycling unit.

METgrain's rounded, irregular shape was readily recycled similar to steel shot. Another benefit of

METgrain's irregular shape is that it is not hazardous under foot when particles escape from the deck blast unit.

CORROLESS

INTERNATIONAL

Circle 110 on Reader Service Card

With over 30 years' experience in providing effective corrosion control services to industries ashore, Cor- roless International has now devel- oped a range of systems and tech- nologies for the marine industry, specifically aimed at reducing ship- owners' maintenance costs.

Corroless, a wholly owned subsid- ...BEING A DAY LATE

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