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TECTYL® 891D, Class I is a solvent cutback, firm film, black asphaltic corrosion preventive compound. TECTYL® 891D, Class I provides long-term protection for metallic surfaces in indoor or outdoor exposure and during international shipments. TECTYL® 891D, Class I is approved under Military Specification MIL-PRF-16173E, which supersedes MIL-P-116J.