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The wetted parts are made of (German) 1.4571 stainless steel or PTFE material. Teflon high-performance specialty coatings are fluorocarbon coatings based on polytetrafluoroethylene as the matrix resin, with the English name Teflon. Teflon is divided into several basic types: PTFE, FEP, PFA, and ETFE. 1. Teflon PTFE: PTFE (polytetrafluoroethylene) non-stick coating can be used continuously at 260°C, with a maximum operating temperature of 290–300°C. It features an extremely low coefficient of friction, good wear resistance, and excellent chemical stability. 2 Teflon FEP: FEP (fluorinated ethylene propylene copolymer) non-stick coating melts and flows during baking to form a pore-free film; it boasts excellent chemical stability and outstanding non-stick properties, with a maximum operating temperature of 200°C. 3. Teflon PFA: PFA (perfluorohalogenated compound) non-stick coatings, like FEP, melt and flow during baking to form a pore-free film. The advantage of PFA is its higher continuous operating temperature of 260°C and greater stiffness, making it particularly suitable for applications requiring anti-sticking properties and chemical resistance in high-temperature conditions. 4 Teflon ETFE: ETFE is a copolymer of ethylene and tetrafluoroethylene; this resin is the toughest fluoropolymer, capable of forming a highly durable coating with excellent chemical resistance, and it can operate continuously at 150°C. After being coated with Teflon, it possesses the following properties: 1. Non-stickness: Almost no substance sticks to the Teflon coating. Very thin films also exhibit excellent non-adhesion properties. 2. Heat resistance: The Teflon coating possesses excellent heat and low-temperature resistance properties. It can withstand high temperatures of up to 300°C for a short period of time; it can generally be used continuously at temperatures between 240°C and 260°C. It possesses significant thermal stability – it remains intact at freezing temperatures without becoming brittle, and it does not melt at high temperatures. 3. Slippage: Teflon coatings have a low coefficient of friction. The friction coefficient changes as the load slides, but its value remains between 0.05 and 0.15. 4. Moisture resistance: The surface of the Teflon coating does not absorb water or oils, and it is also resistant to solutions during manufacturing processes. If a small amount of dirt adheres to it, it can be removed simply by wiping. Short downtime saves labor hours and improves work efficiency. 5. Wear resistance: It exhibits excellent wear resistance under high loads. Under certain loads, it offers the dual advantages of wear resistance and non-adhesion. 6. Corrosion resistance: Teflon is hardly affected by chemicals, allowing components to be protected from any type of chemical corrosion.

The direct translation using Kingsoft Dictionary is 1.4571 made of wet components or polytetrafluoroethylene

WETTED PART Parts in contact with moisture

The term “wetted parts” literally means parts that get wet, but I think translating it as parts in contact with the material is better