Polypropylene and Polyethylene are still in the development and experimental stage (1963), but they will undoubtedly be introduced into the Royal Navy at some future date because they will float.
I Polypropylene kunye ne Polyethylene zisekwixesha lo mzekeliso (1963) kodwa ngokungathandabuzisiyo bayakwazisa kumkhosi wamanzi ngokungabi nankqubela kwixesha elizayo kuba bayakwumthunjala.