... Ta-2.5W), RO5255(Ta-10W) size:Diameter: 1.0-120mmMaterial: RO5200, RO5400, RO5252(Ta-2.5W), ... As per ASTM B521-98Purity: ≥99.95% or 99.99%Table 1. Chemical composition: Chemistry %DesignationChief componentImpurities ... ) 10 1~1.5 (25.4~38.1)0.005 (0.127) 10 1.5~2 (38.1~50.8 ... ), ≥ Yield strength δ0.2, psi (MPa),≥ Elongation in 1"/2" gage length, %, ≥ RO5200/RO5400 30000 (207)20000 ...