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DEFENSE SPECIFICATION DTD 900/4586 MANUFACTURED UNDER LICENSE FROM ROLLS ROYCE PLC TO THEIR SPECIFICATION MSRR9055. A universal jointing compound for use on metal to metal joint faces. Temperature range -50 ̊ C to 300 ̊ C. Resistant to air, turbine and piston engine combustion products, water, glycol/water and methanol/water mixtures, petroleum and synthetic diester lube oils, gas and kerosene fuels, fluorocarbon refrigerants. Non-flammable, non-hardening; remains plastic in the joint. Different grades are determined by the amount of solvent. Hylomar Aero Grade is a highly engineered gasketing compound for use in the aerospace industry.