5pcs stainless steel cabinet Air Vent 19mm-53mm decoration

Building materials are various materials used in construction projects. There are many kinds of building materials, which are roughly divided into: (1) Inorganic materials, which include metal materials (including ferrous metal materials and non-ferrous metal materials) and non-metal materials (such as natural stone, fired earth products, cement, concrete and silicate products) Wait). (2) Organic materials, which include plant materials, synthetic polymer materials (including plastics, coatings, adhesives) and asphalt materials. (3) Composite materials, which include asphalt concrete, polymer concrete, etc., are generally composed of inorganic non-metallic materials and organic materials. The scientific and authoritative definition of ecological building materials is still in the stage of research and determination. The concept of ecological building materials comes from ecological environment materials. The definition of eco-environmental materials is still under study. Its main features are, firstly, saving resources and energy; secondly, reducing environmental pollution, avoiding global warming and the destruction of the ozone layer; thirdly, being easy to recover and recycle. As an important branch of ecological environment materials, according to its meaning, ecological building materials should be coordinated with the ecological environment in the process of material production, use, disposal and recycling, to meet the minimum resource and energy consumption, minimum or no environmental pollution, and the most The best performance, the highest recycling rate requires the design and production of building materials. Obviously, such environmental coordination is a relative and developmental concept.