Polyethylene-polypropylene composite sheets are used to prevent moisture in insulated pipes

What type of waterproofing membrane should be used for low-temperature ethylene pipelines (-104°C)? What type of waterproofing membrane should be used for low-temperature liquid oxygen pipelines (-196°C)?

Polyethylene polypropylene composite sheeting (PE/PET) is a multi-layer composite material, typically formed by combining polyethylene (PE) and polypropylene (PET) fibers through heat pressing or bonding processes. This type of coil combines the waterproof and moisture-resistant properties of polyethylene with the strength and durability of polypropylene, making it an ideal choice for protecting pipes from moisture and corrosion. The characteristics of polyethylene-propylene composite membranes include: 1. Moisture and water resistance: The polyethylene layer provides the membrane with excellent moisture and water resistance. 2. High strength: The polypropylene layer enhances the mechanical strength and wear resistance of the membrane, helping to maintain its stability in various environments. 3. Chemical resistance: This composite material exhibits good resistance to most chemicals, making it suitable for various chemical processing environments. 4. Easy to install: In roll form, it is convenient for transportation and installation, and can be easily adapted to pipes of different shapes and sizes through methods such as cutting and winding. Used in insulated pipes, polyethylene-propylene composite sheets are primarily used to prevent dew formation on the pipe surface. Due to the low surface temperature of the insulated pipes, water vapor in the surrounding humid air condenses on the pipe surface to form dew, which over time can lead to pipe corrosion or reduce the insulating effectiveness of the insulation material. Using this composite coil material can effectively prevent this situation, extend the service life of the pipes, and ensure effective insulation. When in use, polyethylene-propylene composite sheets are generally wrapped tightly around the outside of pipes, and fixed to the outer layer of the insulation material through bonding or mechanical means, thereby forming a protective layer that prevents the penetration of water vapor. .