Comparison between rubber-plastic cotton insulation and polyurethane foam insulation

-90°C. . . . . Standing firm, at such low temperatures

Polyurethane foam is better as it fits tightly to the equipment. The adhesion of rubber-plastic boards is inferior to that of in-situ foaming, and they tend to age easily.

Rubber-plastics are prone to aging, while polyurethane provides good contact and excellent sealing

Firstly, I think what you might want to ask about is the comparison between rubber-plastic materials and PIR materials, rather than a comparison between rubber-plastic materials and polyurethane materials, as polyurethane materials can generally only be used at temperatures above -80°C (as specified in standard GB50264-2013). Regarding rubber-plastic insulation materials, those most commonly used in China are the German brand Aloys and the Italian brand K-FLEX; both of these brands can withstand temperatures down to -200°C. Compared to PIR materials, they result in less heat loss and have a longer service life. What’s more, they are very easy to install and maintain, especially for complex-shaped components. However, their cost is higher than that of PIR materials. Currently, companies such as CNPC, Sinopec, China Resources, Honghua Gas, Huaqi Houpu, Chuan Kong, Hangyang, and Air Liquide use these materials. In terms of thermal conductivity comparison, the thermal conductivities of rubber-plastic and PIR materials are similar at various temperatures ； However, in terms of anti-aging performance, the service life of the rubber and plastic materials used by these two brands is significantly better than that of PIR materials. After being used for two to three years under normal conditions, the thermal conductivity of PIR materials increases considerably due to aging, which can lead to frosting or freezing in the pipes, as well as frequent pressure overloads. You can consult operators from LNG filling stations or air separation plants that you know in order to verify this; they are likely to have the most firsthand experience with this issue. It is advisable to avoid foaming PIR materials on-site, as the temperature, humidity, and other environmental conditions at the site will result in a shorter lifespan for such materials compared to those that are pre-foamed in a factory.