a sprayable polyurethane foam sealant that expands and hardens to fill gaps and cracks in construction and DIY projects

安装门窗时，工人会喷射发泡胶来密封缝隙。

expanded polystyrene (EPS), a lightweight plastic material used primarily for packaging, disposable containers, and thermal insulation

在香港，人们通常把这种白色的塑料包装称为发泡胶。