Unverified80% confidenceTradeoffTime unknown
PP外壁比不锈钢外壁轻约30%但保温性弱，两者保温核心都靠内胆真空层；纯PP无真空内胆的「保温饭盒」实为焖烧原理靠预热，需提前用开水烫盒5分钟
1
Sources
80%
Confidence
Long-term
Relevance
-
First Seen
Sources
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Unverified分格饭盒的保温本质是靠外层不锈钢真空层，真正达到6小时保温的产品需外壳标注316或304不锈钢+真空双层，塑料分格内胆本身几乎无保温能力，仅靠密封盖减缓散热81% similarUnverified保温饭盒的真空层是保温核心，316不锈钢内胆比304更耐盐分腐蚀，适合装酸辣咸食物，长期用不易生锈；纯保温不加热场景优先选真空双层结构80% similarUnverified纯物理保温饭盒（无插电）内胆需为304或316不锈钢+真空双层结构，真空款满装热食6小时后仍可保持50℃以上；单层塑料保温层款2-3小时即降至温热，不适合作为午餐保温80% similarUnverified真空保温饭盒的保温性能取决于内外双层真空层与瓶口密封，优质产品6小时内可维持食物60℃以上；宣称'保温'但无真空层的单层不锈钢盒实际保温能力有限80% similarUnverified双层隔热壁（真空或空气夹层）外壁温度可控制在40℃以下，单层不锈钢在煮沸时外壁可达70℃以上易烫伤，携带或桌面使用务必选双层结构79% similar
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