Kev tiv thaiv ib puag ncig hluav taws xob feem ntau xa mus rau cov cables uas tsis muaj cov hlau nyhav xws li cov hlau lead, cadmium, hexavalent chromium, mercury, thiab tsis muaj cov nplaim hluav taws kub nplaim. Nyob rau tib lub sijhawm, tsis muaj teeb meem halogen roj thiab cov roj corrosive tau tsim, thiab kub taub hau me me thaum sib sau, thiab kev kho mob tom qab tsis ua paug cov av thiab dej.







