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By certification 
Stainless seamless tube, suitable for special gas transportation. Widely used in Semiconductor industry and Laboratory engineering. Bright annealed.
We supply a wide range of stainless steel gas tubes for gas delivery (gas convey) and gas distribution, especially designed for high purity gas convey systems.
Specifications
Standards covers ASTM A 269, A270, A632, or EN ISO standard EN 10216-5.
Size range covers from 1/8″to 2″.
Bright Annealed
http://www.botometal.com/
