能当量值（Energyequivalentvalue）定义为在制造一种产品（例如一种基本原料或一种成品）中所消耗的能和原料的总量，以每公斤兆焦耳为单位。制造常用塑料的能当量值如下：能当量值（yi／kg）低密度聚乙烯（高压法）69高密度聚乙烯（低压法）粉料70粒料72聚丙烯（气相法）73聚 Energy equivalence value is defined as the total amount of energy and feedstock consumed in the manufacture of a product, such as a base stock or a finished product, in joules per kilo. Energy equivalent values ​​for manufacturing common plastics are as follows: Energy equivalent (yi / kg) Low density polyethylene (high pressure) 69 High density polyethylene (low pressure) Powder 70 Pellets 72 Polypropylene (gas phase) 73 Poly