![]() ![]() The mixture can be moulded into any shape and frozen, and it will be tough and durable, as long as it is kept at or below freezing temperature. However, it can be repaired and maintained using seawater as a raw material. Pykrete is slightly more difficult to form than concrete, as it expands during the freezing process. These physical properties can make the material comparable to concrete, as long as the material is kept frozen. Pykrete features unusual properties, including a relatively slow melting rate due to its low thermal conductivity, as well as a vastly improved strength and toughness compared to ordinary ice. Pykrete is a frozen ice composite, originally made of approximately 14% sawdust or some other form of wood pulp (such as paper) and 86% ice by weight (6 to 1 by weight).ĭuring World War II, Geoffrey Pyke proposed it as a candidate material for a supersized aircraft carrier for the British Royal Navy. Ice alloy containing sawdust or another form of wood pulp A slab of pykrete Pykrete is made of 14% sawdust and 86% water by mass. ![]()
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