Electropolishing is a process in which metal undergoes a special anodic treatment in an electrolytic solution to obtain a smooth and bright surface. Stainless steel electropolished tubing (EP tubing) is a product processed from bright annealed tubing (BA tubing) by electropolishing the internal surface. FITOK has been adopting strict specifications for raw materials, electropolishing process, ultra-pure water cleaning, and packaging in cleanroom to effectively avoid contaminant residues and achieve better roughness, cleanliness, corrosion resistance and weldability of stainless steel EP tubing. FITOK stainless steel EP tubing is widely used in high purity and ultra high purity fluid systems in semiconductor, pharmaceutical, fine chemical, food & beverage, analytical and other industries.


FITOK EP tubing, including TEP series and PEP series, is available in standard lengths of 20 ft, 4 m and 6 m, etc. to meet customers’ varying requirements. The internal surface can be electropolished to roughness of Ra ≤ 5 μin (0.13 μm), and the external surface to roughness of Ra ≤ 40 μin (1 μm).

Table 1

Product Standard O.D. External Surface Roughness Internal Surface Roughness Length
TEP Series ASTM A269/A632 1/4”-2 1/2” Ra ≤ 40 μin (1 μm) Ra ≤ 5 μin (0.13 μm)
Ra ≤ 7 μin (0.18 μm)
Ra ≤ 10 μin (0.25 μm)
20 ft, 4 m and 6 m
PEP Series JIS G3459 6A-50A 4 m and 6 m
ASTM A312 NPS 1/8-NPS 2 20 ft, 4 m and 6 m



FITOK EP tubing is made of customized 316L SS, 316L SS VAR and 316L SS VIM-VAR complying with SEMI F20 standard. 316L is commonly used for high purity (HP) and ultra high purity (UHP) products, which has excellent corrosion resistance and oxidation resistance. 316L VAR and 316L VIM-VAR reduce non-metallic inclusions by special refining to enhance the purity of the materials. Customers can choose different materials according to their actual needs.

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