Rubber and silicon O rings for group portafilter, steam wand, and lever groups.
EPDM stands for Ethylene Propylene Diene Monomer, which is a type of synthetic rubber made from the chemicals stated in its name.
FKM is an abbreviation of Fluorine Kautschuk Materia. It is commonly called fluorine rubber or fluoro-rubber. FKM is a family of fluorocarbon-based fluoroelastomer materials defined by ASTM International standard D1418, and ISO standard 1629.
The difference between silicone and rubber is that most of the rubbers contain polymer chains of carbon, however, silicone rubbers contain silicon in polymer chains instead of carbon.
Silicone is a Plastic Polymer, although it may be referred to as synthetic rubber. However, it's slightly more complicated than that. Silicone, often known as polysiloxane, is a polymer composed of siloxane. Colorless oils or rubber-like compounds are the most common.
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