Ship Hulls and Materials

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Ship Hulls and Materials

There is no ship-type-independent ranking of materials for ship hulls. The construction methods covered also depend on which vessel classes the relevant design and safety rules apply to. Lloyd’s Register’s current rules for Special Service Craft illustrate this distinction in practice.

Materials in the rules

Published on 1 July 2026, Lloyd’s Register’s rules for Special Service Craft apply to certain seagoing motor, sailing and auxiliary vessels. They list steel, aluminium alloys, composite materials and combinations of these materials. The rules cover, among other things, high-speed and light-displacement craft, multihull vessels and yachts 24 metres or more in length, each within the defined scope of the rules. This list describes the scope of these rules; it is not a general approval of every material for every ship.

Ship design is also governed by safety requirements relating to construction, structure, subdivision and stability. The International Maritime Organization (IMO) also identifies the testing and approval of designs and materials as part of its work on safe ship design. The choice and use of materials are therefore assessed in relation to a specific design and the rules that apply to it.

Consider the rules and vessel type together

For a technical comparison, the first thing to establish is which vessel class and scope of rules are meant. For example, the Lloyd’s Register rules for Special Service Craft limit their scope according to construction type and dimensions. Statements about materials should therefore be read in conjunction with the vessel type and the applicable rules. Technical ship classification refers to the rules of the relevant classification society.

Materials are considered in the design in relation to the particular hull and its method of construction. In sectional and block construction, individual assemblies are joined to form the hull. The terms cruise ship and passenger ship also describe different aspects of a vessel and help distinguish its type from the scope of the rules.