Protection to chemicals

Lead sheath

It is the best protective measure against chemicals, but is only used when strictly necessary because of its high weight.

Multi-layer sheath

It consists of a longitudinal (with overlap) plastic-coated aluminium foil, a high-density polyethylene sheath and an additional cover of polyamide.
The aluminium foil is bonded inside the overlap and to the inner surface of the high-density polyethylene sheath. In many cases, a multi-layer sheath can be an adequate alternative to lead sheath, with the advantage of having much lighter cables.