Niobium Capillary Pipe Grade:R04200, R04210, R04251, R04261 Refractoriness:Above 2000 Different sizes are available Niobium Capillary PipeGrade:R04200, R04210, R04251, R04261Refractoriness:Above 2000Different sizes are availableNiobium Capillary Pipestandard ASTM B394Grade: R04200-1 type R04210-2 type R04251-3 type R04261-4 typeSpec.: ASTM B394Size: od.4mm-120mm x thk.0.3mm-20mm x 6000mm L.