Frequently Asked Questions
A coating is applied to a thickness of 0.08mm to 1.5mm. On the other hand lining can be between 3mm to 5mm. Lining is normally a sheet that is either stuck to or welded to the vessel. There can be some air entrapped between the liner and the metal. During thermal cycling, the lining can get damaged and then fail. Since the lining is only mechanically bonded to metal it might fail in vacuum conditions. On the other hand, coating involves a thorough cleaning of the surface followed by a layer of primer and midcoat. The required thickness of Fluoropolymer is then developed through multiple coats with each layer baked in the oven sequentially. This way, it can withstand thermal cycling as well as vacuum conditions. Also, since a coating is much thinner than a lining, heat transfer properties are better.
Fluoropolymer coatings offer much better corrosion resistance and resistance to chemicals as compared to epoxy coatings. The operating temperature range for fluoropolymers is much wider from -30°C to 260°C.
Ami Polymers has access to a variety of grades of fluoropolymer coatings from Chemours and is abreast of the latest technological developments in this field. We have provided food grade (FDA approved) coatings to several clients when the application demanded it.
The process of coating involves a baking step. This requires putting the coated vessel in a convection oven for extended periods of time. The facilities for this are readily available at Ami Polymer’s plant in Ankleshwar, Gujarat and hence we strongly recommend that the parts be shipped to our plant for low volume jobs. However, other arrangements can be discussed on a case-by-case basis.
In situ coating (i.e. with the part in use in operations) is not possible for internal surfaces.
In some cases, our clients have been able to use lower grade steel alloys with teflon coatings instead of stainless steel or Hastelloy, Inconel etc (CRAs). This has helped our clients reduce their equipment costs. Our technical experts can help you evaluate this for your specific use case.
We have coatings that can prevent corrosion under insulation. These are typically sprayed on pipelines and other complicated parts of the piping network like valves, flanges, pumps etc. The coating can be applied in-situ and helps mitigate corrosion on outer wall surfaces. The operating range is from -30°C to 650°C. The insulation coating thickness is typically under 10mm (compared to glass wool which can be in the range of 50mm).
Yes, Ami Polymers is first and foremost, a problem solver. We will work with you to understand your pain areas and then propose a solution with the most suitable coating system, coating thickness etc. Please fill out this form to help us understand your problem better. You can also contact us at amipolymers@gmail.com.