SCHEDULE 10 REQUIREMENTS FOR LIFEBUOYS
PART II
1 Every lifebuoy shall be constructed of cork, evenly formed and securely plugged, or of other equally efficient buoyant material which shall not be adversely affected by oil or oil products, and shall be capable of floating in fresh water for at least 24 hours with 10·45 kilogrammes of iron suspended from it.
2 Every lifebuoy made of plastic or other synthetic compounds shall be capable of retaining its buoyant properties and durability in contact with sea water or oil products, or under variation of temperature or climatic changes prevailing in open sea voyages.
3 A lifebuoy shall not be filled with rushes, cork shavings, granulated cork or any loose granulated material, and its buoyancy shall not depend upon air compartments which require to be inflated.
4 The inside diameter of the lifebuoy shall be 355 millimetres and the outside diameter 610 millimetres. The major axis of the section shall be 125 millimetres and the minor axis from 89 to 100 millimetres.
5 Every lifebuoy shall be of a highly visible colour.
Rule 87