... %; 4) good price CuprousOxide NanopowderSpecification:1, Color: ……………………………………. brick red2, CAS#: ……………………………………1317-39-1 3, average particle size: …………………….20 nm4, Purity≥……………………………………99.5 ... improver additive in solid propellant and explosive; 6, Analytical reagent;7, Inflaming retarding and smoke suppressor additive for PVC; 20nm Cuprous ...