Choosing The Right Chemically Compatible Gasket For Your Chemical Hose Assembly

Sometimes the smallest components of large systems can be the most problematic. Why? Because of their scale their impact is often not appropriately accounted for. One thing you learn with time in the chemical transfer hose industry is that each component part matters because every piece of a hose assembly designed to transport often expensive or potentially hazardous chemicals is a future candidate to cause failure of the whole system. 

It is common sense to ensure your hose tube and construction are conducive to your application. Making sure that the gaskets sealing that chemical transfer provide the durability and resistance necessary to the media being conveyed is an important choice to realize the full working life of your system. In the below article, we examine the three most popular gasket sealants for a chemical hose assembly with couplers. Please work with one the Hose Fab Shop specialists to choose the exact components you need as slightly different applications can require drastically different solutions. We provide many gasket types and sizes beyond material types listed. Check out our dedicated gaskets website at >>


Viton Gaskets: Like Chapstick, Kleenex, or Velcro – Viton was originally the specific trademark of the DuPont Company. While still trademarked, today it has colloquially become known in the industrial space as a family of Fluoroelastomers (FKM) able to withstand high heat and provide resistance to many types of chemicals. Due to its ability to maintain resistance to compression and remain elastic in high temperature environments, many consider the Viton seal to be one of the best options in a chemical hose assembly. Viton sealants are used in a variety of industries including petrochemical, aerospace, automotive, chemical processing and instances where interaction with most aggressive chemical, like acids, aliphatic and aromatic hydrocarbons, fuels, and ozone are required. Operates well in temperatures of 10F up to 300F making it suitable for most industrial applications. 


Buna Gaskets: Known as Nitrile, Buna, or Buna-N, this seal material is the standard gasket supplied by coupling manufacturers with the coupling. Buna is a good choice for water and petroleum applications. Relative to its cost, it provides resistance to various chemical compounds, but will start to see degradation of its flexibility in environments of high heat or consistent exposure to many chemicals. As a widely used cost efficient option, Buna seals can be a good choice, but care should be taken to ensure that the chemical being transferred is compatible with Nitrile such as, common lubricants, petroleum oils and water as well as avoiding avoiding mineral acids, and situations where the transfer system could encounter oxidation, or ozone exposure. 


PTFE Gaskets: Also called Teflon, these gaskets are some of the most specialized and costly in the industry. As a nontoxic fluorocarbon-based polymer the cost of this sealant comes with several material advantages. Excellent chemical resistance, excellent for slide bearings and liners, chemically inert in most applications, low friction coefficient, FDA approval (in many cases), provides electrical insulation, and soft texture allows for easy machining of specialized gaskets. Many specialized industries use the PTFE Gasket including pharmaceutical, cosmetic, complex automotive, and food & beverage. These sealants are used as components in a Teflon encapsulated rubber hose assembly, also known as a wetted rubber chemical hose assembly.