Normally made from polyethylene outer skin and polyurethane foam inner core.
Cargo ships shall carry no less than the number or lifebuoys complying with the requirements of SOLAS described in the table below.
In compliance with requirements it is fitted with a buoyant lifeline.
When being in used for operating the quickrelease arrangement provided for the selfactivated smoke signals and selfigniting lights, the lifebuoy have a mass sufficient to operate the quickrelease arrangement or 4 kgs, whichever is the greater.