1. Halogen-free, low-smoke, flame-retardant, and fire-resistant.
2. Simply put, the former is an unsheathed cable, while the latter is a sheathed cable. The insulation is made of irradiated cross-linked polyethylene. The cables listed by the original poster are all low-smoke, halogen-free, environmentally friendly, and fire-resistant cables, and are considered clean cables.
