1) Composite material 2) Concrete
Found on
https://www.crosswordclues.com/clue/pykrete
Pykrete is a frozen composite material made of approximately 14 percent sawdust or some other form of wood pulp (such as paper) and 86 percent ice by weight (6 to 1 by weight). Its use was proposed during World War II by Geoffrey Pyke to the British Royal Navy as a candidate material for making a huge, unsinkable aircraft carrier. Pykrete has some...
Found on
http://en.wikipedia.org/wiki/Pykrete
No exact match found.
