What are the options for outer tube material for immersion heaters- Zhejiang Shangguijuli Special Material Technology Co., Ltd.

There are various options for the outer tube materials of immersion heaters, and here are some common materials and their characteristics:

PFA Tube (Perfluoroalkoxy):
Characteristics: Operating temperature range: -200°C to 260°C.
Ageing resistance: Can withstand long-term exposure to ozone and sunlight without aging.
High transparency: Lowest refractive index among all plastics, allowing for clear observation of the flow of media inside the tube.
Corrosion resistance: Resistant to strong acids, strong oxidants, strong reducing agents, and various organic solvents, except molten alkali metals, fluorinated media, and temperatures exceeding 300°C.
Common applications: Plastic immersion heaters.

Ceramics and Industrial Glass:
Characteristics: Excellent chemical resistance. The cylindrical design allows for high power in limited spaces.
Applications: Often used for heating highly corrosive liquids to ensure stability in corrosive environments.

Metal Alloy Materials: Common materials include stainless steel (such as 304, 316L, 310S, etc.), nickel-chromium alloys, titanium alloys, etc.
Characteristics: Stainless steel liquid immersion heating tubes are corrosion-resistant, do not stain or change color, suitable for heating various liquids. Nickel-chromium alloy liquid immersion heating tubes have good thermal conductivity and high temperature oxidation resistance, suitable for high-temperature liquid heating. Titanium alloy liquid immersion heating tubes have excellent corrosion resistance and heating uniformity, suitable for use in highly corrosive liquids.

Other Materials: In800, In840, aluminum, copper, low carbon steel, etc., are also commonly used as outer tube materials for immersion heaters. The choice of material depends on specific usage environments, liquid properties (such as corrosiveness, temperature, pressure, etc.), and safety requirements to ensure stable operation and safety of the heater.