Pipe insulation materials are functional materials that are wrapped around the outside of pipes to reduce heat or cold loss, prevent burns and freezing, and stabilize the temperature of the medium. Their core principle is similar to a cotton coat or a thermos; they maintain the energy state inside the pipe by hindering heat conduction.
The main functions include: energy saving and consumption reduction, reducing temperature loss of steam, hot water, or refrigerant during transportation; safety protection, preventing burns from high-temperature pipes, condensation on low-temperature pipe surfaces, or freezing and cracking in winter; and ensuring the stability of industrial processes.
Based on their form and performance, common insulation materials can be divided into four categories:
- First, fibrous materials, such as rock wool and glass wool, are high-temperature resistant and non-combustible, suitable for steam pipes and applications with high fire protection requirements, but susceptible to moisture.
- Second, porous foam materials, such as rubber-plastic sponge and polyurethane, have a closed-cell structure that prevents water leakage and condensation, making them particularly suitable for central air conditioning chilled water pipes and hot water pipes.
- Third, granular or powdered materials, such as expanded perlite and aerogel felt, can withstand extremely high or low temperatures and are used in power plants or liquefied natural gas pipelines.
- Fourth, composite materials, such as nano-aerogel composite reflective layers, have extremely low thermal conductivity and are thin and lightweight, but are expensive and mostly used in aerospace or high-end industries.
When selecting insulation materials, several key indicators need to be considered:
The lower the thermal conductivity (λ value), the stronger the insulation performance; the operating temperature range must match the temperature of the pipeline medium; fire resistance ratings range from Class A (non-combustible) to Class B2 (combustible); and the moisture absorption rate is especially important for low-temperature pipelines, as water absorption will severely damage the insulation effect.
During installation, it typically consists of an insulation layer and a protective layer, such as aluminum cladding or PVC, to prevent water damage. Proper selection of pipe insulation materials can save energy costs and improve system safety and lifespan.