R502 is considered to be one refrigerant with good performance, but it will be forbidden to be used because its pollution to the ozonic atmosphere.
R 502被认为是一种性能良好的制冷剂，但由于其对臭氧层的污染即将被禁止使用。
2
Then ozonic-hydrogen peroxide bleaching were carried out and the results show that the higher of Kappa number, the poor of the delignification selectivity and the lower of brightness rising.