密封物 meaning in Chinese

encapsulant
sealer

Packaging ; plastic closures for metal and plastic tubes
包装.金属及塑料软管用端口塑料密封物
Aluminium and aluminium alloys - rolled products for cans , closures and lids - specifications
铝和铝合金.金属盒密封物和盖子用轧制品规范
Standard specification for lubricant for installation of preformed compression seals in concrete pavements
混凝土铺面用预制压缩密封物安装用润滑剂的标准规范