The present disclosure discloses a multi-layer co-extrusion stone plastic floor. The multi-layer co-extrusion stone plastic floor includes at least one co-extrusion stone layer, the co-extrusion stone plastic layer including a first stable layer, a stone plastic rigid layer, and a second stable layer successively. A size change rate of the first stable layer and the second stable layer is within a range of 0 to 0.12% within a temperature range of −15° C. to 80° C. At least one of the first stable layer, the stone plastic rigid layer, and the second stable layer includes composite particles of acrylate copolymer (ACR)/nano SiO.sub.2. The multi-layer co-extrusion stone plastic floor has improved strength, improved thermal stability and reduce thermal deformation by adding stable layers above/below the plastic rigid layer and adding the composite particles of ACR/nano SiO.sub.2.

A polymeric material having anisotropic properties, such as mechanical properties (e.g., modulus of elasticity), thermal properties, barrier properties (e.g., breathability), and so forth, is provided. The anisotropic properties can be achieved for a single, monolithic polymeric material through selective control over the manner in which the material is formed. For example, one or more zones of the polymeric material can be strained to create a unique network of pores within the strained zone(s). However, zones of the polymeric material that are not subjected to the same degree of deformational strain will not have the same pore volume, and in some cases, may even lack a porous network altogether.