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The thermal insulation wall of SunRain has patented technology. The insulation layer of SunRain tank uses Italian 360-degree fully automatic high-temperature and high-pressure foaming technology, and uses the green fluorine-free foam of Honeywell, a Fortune 500 company. Technology, after constant temperature treatment, energy saving and environmental protection. On the basis of fluorine-free foam insulation, it also uses the latest patented ceramic nano-Ramp; A insulation film technology, which provides longer-lasting heat, no heat loss, and an overall thermal insulation performance improvement of 50%. Those who have done scientific calculations on this cannot be wrong.