Appearance: Dark grey Metallic Powder Application: Used as rhenium element standard sample; As an additive for superalloys; Raw material for various rhenium parts. Chemical Specification: Re-4N grade ≥99.99%(subtraction method) Re-5N grade ≥99.999%(subtraction method, Except gas element) Particle size:-200 mesh, provide laser particle size distribution test report or SEM photos as per customers request.