Eleven grades.
One place that compares them.

GI, Galvalume, ZAM, PPGL — what's actually different, translated from the mill data instead of a spec sheet.

Articles in this pillar

MRM's 11-grade steel catalogue, translated into plain-language buyer content — our deepest content moat.

July 1, 20262 minute read

Three coatings, three levels of corrosion resistance — and which one actually fits your climate.

May 12, 20262 minute read

Which substrate actually holds up to salt air, and why.

April 24, 20262 minute read

Pre-painted Galvalume, explained from the paint layer down.

April 3, 20262 minute read

A premium grade — here's when it earns its price.

March 18, 20262 minute read

The newest coating technology in the lineup, unpacked.

June 21, 20262 minute read

Every term used across this site, defined in one place.

May 30, 20262 minute read

A decision framework for matching grade, coating, and budget to your site conditions.

Explore the full 11-grade catalogue, mill-certified and ready to quote.