Castagra is an American oil and gas and wastewater industries protective coatings company that has products that defeat some of the harshest corrosion assaults the natural and unnatural world can throw at steel and concrete. Approved and used by the world’s leading oil and gas field services companies, this ‘plasticized gypsum’ is non-toxic, contains no Volatile Organic Compounds (VOCs), naturally fire retardant, extremely durable and cost-effective.