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The performance of fluoroelastomers in aggressive chemicals depends on the nature of the base polymer and the compounding ingredients used for moulding the final products (e.g. O-rings, shaft seals). This performance can vary significantly when end-users purchase polymer-containing rubber goods from different sources.
FKM rubber is widely used in the watch strap industry due to its superior resistance to chemicals, extreme temperatures, and wear. It is commonly found in premium aftermarket watch straps, offering durability and a comfortable fit.
In addition, chemical compatibility refers to the container material being acceptable to store the chemical or for a tool or object that comes in contact with a chemical to not degrade. For example, when stirring a chemical, the stirrer must be stable in the chemical that is being stirred. Many companies publish chemical resistance charts.
Ethylene propylene rubber (EPR) Fluoroelastomer (FKM): noted for their very high resistance to heat and a wide variety of chemicals. Other key benefits include excellent resistance to aging and ozone, very low gas permeability, and the fact that the materials are self-extinguishing. Standard FKM materials have excellent resistance to mineral ...
This contributes to their non-stick and friction reducing properties. Also, they are stable due to the stability multiple carbon–fluorine bonds add to a chemical compound. Fluoropolymers may be mechanically characterized as thermosets or thermoplastics. Fluoropolymers can be homopolymers or Copolymer. [citation needed]
PFA offers high melt strength, stability at high processing temperatures, excellent crack and stress resistance and a low coefficient of friction. [1] Similarly enhanced processing properties are found in fluorinated ethylene propylene (FEP), the copolymer of tetrafluoroethylene and hexafluoropropylene . [ 5 ]
The chemical resistance of a material or surface can be determined in compliance with ISO 2812 Paints and varnishes – Determination of resistance to liquids – Part 1: Immersion in liquids other than water (ISO 2812-1:2007 [1]); German Version EN ISO 2812-1:2007 or Part 4: Spotting methods (ISO 2812-4:2007 [2]); German Version EN ISO 2812-4:2007.
It is nonflammable [14] and the heat resistance is up to 175 °C. [15] It has a low coefficient of thermal expansion. The glass transition temperature (T g) is around 45 °C. [1] PCTFE has one of the highest limiting oxygen index (LOI). [16] It has good chemical resistance. It also exhibits properties like zero moisture absorption and non ...