The PE used for children's foam floor mats is soft and waxy to the touch. Compared with the same plastic, it is light and transparent. The flame is blue when burning. It is non-toxic and harmless to human body. Commercially available high-density polyethylene (HDPE), density 0.945~0.96 g/cm3, melting point 125~137 ℃; Linear low density PE (LLDPE), density 0.925 g/cm3, melting point 120~125 ℃; High pressure low density PE (HP-LDPE), density 0.918 g/cm3, melting point 105~115 ℃