At present Middle Density Fiberboard (MDF) are applied on food outside package.The Urea-formaldehyde (UF) which has free formaldehyde was often used in MDF, so it does harm to the human health.

• 摘要目前中密度纤维板常常作为食品和礼品外包装材料，但中密度纤维板常常使用含有游离甲醛的脲醛树脂，从而对人体有一定的危害。