Teflon coating of stainless steel
Q. I'd like to manufacture a product in SS306 and I want to coat it with Teflon coating.
My condition is: The SS tube with OD 4.6 mm, ID 2.6 mm and length 310 mm. I'd like to coat Teflon coating thickness of 20 microns on OD throughout length.
Purpose: Anti corrosion, non conductivity of heat and non conductivity of electric current.
Area of application: Pharmaceutical / Surgical.
1.Please let me know the best method of Teflon coating considering my area of application.?
2. Is there any specification for Teflon coating, surface finish, hardness, etc.? If so, what purpose it will be used?
With regards,M. Mahendran
- Coimbatore, Tamil Nadu, INDIA
A. Coating the OD is absolutely no problem. Typical two coat Teflon coating is 35 microns +/- 10 microns. Lower thickness can be archived with good coating practices.
It will serve the purpose of anti-corrosion, heat transfer and electrical insulation (to some extent only).
However, if the application is surgical, then Dupont specifically restricts use of Teflon®. Prior clearance will be necessary from Dupont on selection of grades and the application process.
Hope this helps you.
Coatec India -
Mohali, Punjab, India
June 18, 2008
I need to coat a SS-316 rod (currently coated with epoxy powder coating) of 60 cm length & 6 mm dia with Teflon, over the powder coating.
I need to use it for a prototype design.
It should meet the following demands
- Environment of application is oil & salt water
- Need to get electrical insulation
- Need to know how long it will last, if it is used in a water flow region?
- What should be the coating thickness to withstand such a rough condition?
student - India
November 10, 2009
A. Try PEEK Coating instead.William Maghen
- Bayan Lepas, Penang, Malaysia
June 27, 2010
Thanks William, but are you suggesting that PEEK coatings would be better than Teflon for Mahendran's pharmaceutical application, or that they would be better than Teflon over the epoxy on Isaac's rods? And in what ways would they be better for this specific application? Thanks.
Ted Mooney, P.E. RET
Brick, New Jersey
June 1, 2012
Q. I am interested in a thin coating of a low coefficient of friction material for stainless steel sheet metal, to prevent metal to metal contact and act as a smooth surface when components are slid against each other.
Minimal load bearing on the surface.
- West Berlin, New Jersey
June 25, 2012
A. Depending if it has to be permanent and very long lasting or is only for occasional contact and short periods the possibilities are so vast and range from the cheapest special greases to mid-cost treatments like Teflon spray, to more expensive platings to the most expensive and exotic composites deposited by PVD, CVD, Thermospray, Plasma, etc.
G. Marrufo - Mexico
Monterrey, NL, Mexico
A. Teflon adhesion to stainless steel is a problem. However, it was sorted out when Gillette introduced their Teflon coated razor blades and put down an interlayer of Pt-Cr onto their stainless steel blades. This is well patented and documented, but in essence, the process involved vacuum deposition of the Pt-Cr followed by spray coating and sinter polymerisation of PTFE. The adhesion mechanism is believed to go through a Cr-F complex structure, although I am not sure of its details.
R&D practical scientist
Chesham, Bucks, UK
January 31, 2013
Q. Can we coat Teflon coating of 70 microns on SS304 material. If so what is temperature that needs to be maintained for curing.R.Ramakrishnan