... ~40PU thickness: 50mm,75mm,100mm,120mm,150mm,200mm quality: highSliding door internal polyurethane foam overall.Application industry:Food, industrial, supermarket, warehousing ... ageing, long-term working temperature is -55°C~+135°C.door board:Using polyurethane foam with panel overall, exterior level off, insulation ... box shell, the more enhance the overall effect. cold storage door