FITOK Electropolished Tubing (EP Tubing) with Outstanding Surface Quality and Fast Delivery

02/05/2023
4148

FITOK EP tubing

 

Introduction

 

 

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.

 

Specifications

 

 

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

 

Advantages

 

 

  • Material
  •  

    FITOK EP tubing is made of customized 316L SS, 316L SS 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 reduces non-metallic inclusions by special refining to enhance the purity of the materials. Customers can choose different materials according to their actual needs. The specific composition is detailed as follows:

     

    Table 2

     
    Grade Standard FITOK Designator Composition %
    C Mn P S Si Ni Cr Mo
    316L ASTM 6L ≤ 0.035 ≤ 2.00 ≤ 0.045 ≤ 0.03 ≤ 1.00 10.0-15.0 16.0-18.0 2.0-3.0
    JIS G3459 ≤ 0.03 12.0-16.0
    316L VAR ASTM 6LV ≤ 1.50 ≤ 0.01 10.0-15.0

    ① The carbon content of tubing with outside diameter smaller than 1/2" or wall thickness smaller than 0.049" is allowed up to 0.04%.

     

  • Electropolishing Process
  •  

    The internal surface of FITOK EP tubing is electropolished to improve the smoothness of the flow path and form a chromium-rich layer on the metal surface to improve corrosion resistance. Electropolished tubing is subject to passivation treatment to remove free iron ions.

     

    Relevant standards for electropolishing and passivation treatment:

    • ASTM E1558 Standard Guide for Electrolytic Polishing of Metallographic Specimens
    • ASTM A380 Standard Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems
    • ASTM A967 Standard Specification for Chemical Passivation Treatments for Stainless Steel Parts

     

    The internal surface of FITOK EP tubing can meet the following test standards after electropolishing:

     

    Table 3

     
    Test Item Test Standard
    Surface roughness Ra SEMI F37
    Oxide layer thickness SEMI F72
    Surface defects SEMI F73
    Cr/Fe SEMI F60
    CrO/FeO

     

  • Quality Inspection
  •  

    Test methods include visual inspection, dimension inspection, surface roughness measurement, particle inspection, moisture testing, SEM, AES and ESCA or XPS.

     

  • Cleaning and Packaging
  •  

    FITOK EP tubing can effectively avoid contaminant residues with strict cleaning and packaging processes. EP tubing is ultrasonically cleaned, washed and rinsed, then purged and dried with ultra high purity hot nitrogen before being packaged in the NEBB-certified ISO 4 cleanroom.

     

    FITOK EP tubing packaging complies with SEMI E49 standard. It is cleaned with ultra high pressure nitrogen, end capped, and bagged in double polyethylene bags with the inner bag filled with ultra high purity nitrogen to ensure the product’s cleanliness and maximize the protection of the product in the logistics and transportation process from damage.

     

  • Prefabrication Services Available
  •  

    FITOK can provide EP bent tubing upon customer's request. EP bent tubing integrate with FITOK high purity products (such as all-welded check valves, face seal fittings, welded fittings, diaphragm valves, regulators, etc.) to form EP bent tubing assemblies. FITOK can prefabricate EP bent tubing assemblies according to customers’ requirements to help customers improve installation efficiency.

     

    Prefabricated EP Bent Tubing Assemblies

    Figure 1 Prefabricated EP Bent Tubing Assemblies

     

  • Fast Delivery
  •  

    As the global semiconductor industry develops, the demand for high purity components like EP tubing meeting the high cleanliness and high performance requirements of the semiconductor manufacturing industry is growing. As a global leading supplier of valves, fittings and tubing, FITOK can provide customers with one-stop solutions and professional services. With flexible manufacturing systems, mature and complete supply chain systems and warehousing systems, as well as sufficient finished goods inventory, FITOK can help customers save procurement and inventory costs and achieve fast delivery.

     

    FITOK plant for stainless steel straight tubing, coiled tubing and etc. has obtained ISO 9001 quality management system certification with an annual production capacity of 500,000 m EP tubing. FITOK has enough inventory of EP tubing to meet your demand, please contact us for more information.

     

    Please see the EP Tubing Catalog for more information. Should you have any questions, please contact us directly and We will reach you soon.

     

    Related Articles:

    This website uses cookies in order to improve your user experience. By clicking "Accept" or continuing to use our website, you consent to our use of cookies as defined in this Cookie Policy.

    fitokgroup.com Cookie Notice and Disclosure

    Last updated June 16, 2020

    FITOK USE OF COOKIES AND SIMILAR TECHNOLOGY

    Like many companies, FITOK Group, its subsidiaries and its authorized sales and service centers (collectively, "FITOK" or "we, " "us, " or "our") use "cookies" and similar tools on fitokgroup.com and any authorized sales and service center website (collectively, the "Sites") to facilitate and improve your online experience. This Notice explains how we do that.  
    What are cookies?
    A cookie is a small file or piece of information which is downloaded to your computer or device when you visit the Sites, and then sent back to the Sites in order to allow us to recognize your computer or device later. Although certain cookies may contain personal data – for example, if you click to "remember me" when logging in, a cookie may store your username – most cookies won’t collect personal data that identifies you. Rather, most cookies collect general information, such as how users arrive at and use the Sites, or a user’s general location. By collecting this information, cookies help to analyze web traffic and allow web applications to respond to you as an individual. The web application can tailor its operations to your needs, likes and dislikes by gathering and remembering information about your preferences.
    How do we use cookies?
    Our Sites utilize cookies for several purposes, including the storage of information required to determine how to properly deliver content to your computer or device. A cookie is provided to all visitors to fitokgroup.com, regardless of whether you register with an authorized sales and service center.
    For users who do register with an authorized sales and service center, a profile containing the registration information is generated by our website, and used for several purposes:
    1. to match you with content that is associated with your interests and to direct you to additional resources and tools that can save you time;
    2. to enable a fast response for service or follow-up request from our website;
    3. to verify your identity;
    4. to send you an electronic newsletter, other information and content; and
    5. to contact you when necessary.
    What kinds of cookies do we use?
    We may use cookies for a number of purposes:
    1. Session Cookies These cookies are used 'in-session' each time you visit and then expire when you leave a Site or shortly thereafter.  They are not stored on your computer or device permanently, do not contain any personal data and help by minimizing the need to transfer personal data across the internet. These cookies can be deleted or you can refuse to allow their use, but this will hamper the performance and your experience in using the Sites. These cookies also take time stamps that record when you access the Sites and when you leave the Sites.
    2. Tracking Cookies – These cookies enable us to recognize repeat visitors to the Sites. By matching an anonymous, randomly generated identifier, a tracking cookie keeps track of where a user of the Sites came from, what search engine they may have used, what link they clicked on, what keyword they used and where they were in the world when they accessed the Sites. By monitoring this data, we can make improvements to the Sites.
    3. Persistent Cookies – This type of cookie is saved on your computer or device for a fixed period (sometimes for a few hours, sometimes for a year or longer) and is not deleted when the browser is closed. Persistent cookies are used where we need to remember who you are for more than one browsing session. For example, this type of cookie can be used to store your preferences, so that they are remembered for the next visit to the Sites.
    4. Performance or Analytical Cookies Performance cookies are used to analyze how the Sites are used and to monitor their performance, which allows us to improve your experience in using the Sites. These cookies help us to tailor the content of the Sites to reflect what the Site users find most interesting and to identify when technical issues with the Sites arise. We may also use this data to compile reports to help us to analyze how Sites are used, what the most common issues are and how we can improve the Sites.
    Can the Cookies be blocked?
    Yes. Most internet browsers are initially set up to automatically accept cookies. You can, however, change your browser settings to block cookies or to alert you when cookies are being sent to your device. There are a number of ways to manage cookies. Please refer to your browser instructions or help screen to learn more about how to adjust or modify your browser settings. Instructions for blocking or allowing cookies in popular web browsing software can be found by clicking the following links:
    Internet Explorer
    Firefox
    Google Chrome
    Microsoft Edge
    Safari
    AboutCookies.org 
    Please be aware that if you disable the cookies that we use, this may impact your experience while on the Sites. For example, some features and services on the Sites may not work properly because we may not be able to recognize and associate you with your FITOK account(s). In addition, the offers we provide when you visit us may not be as relevant to you or tailored to your interests.