5. THE HISTORY OF PYKRETE
Invented by Max
Perutz??
It is named after
Geoffrey Pyke. He
proposed that the
Royal Navy make a
huge, unsinkable
aircraft carrier using
this material during
World War II
6. Interesting properties of pykrete
It has a slow melting rate due to low
thermal conductivity
It has an improved strength and
toughness over pure ice, it is actually
closer to concrete in strength
It is slightly harder to form than
concrete, because it expands while
freezing
7. A ship made of this material would be
unsinkable; torpedoes could hit it and do little
damage
It has a crush resistance of greater then
3,000 per square inch, so a one-inch column
could support the weight of a typical car
The wood pulp in the material makes it
extremely stable at high temperatures
If a .303 caliber bullet is fired at the material,
it will penetrate only 6.5 inches
8. Comparison of ice and pykrete
Ice-before Ice-after
Pykrete-before Pykrete-after
These photos were taken
on July 22, 2000 by J
Gordon Holley
Both the pykrete and ice
were frozen in 1 gallon
milk jugs for one week.
The pykrete was 10%
sawdust by weight
Both were shot with a .
243 rifle at 100 meters. A .
243 bullet fired form 300
meters can push a 1 lb
object for a distance of
1000 feet
9. Tests on Ice and Pykrete
The thickness of both sample are 9cm
Melting at temo
TEST PYKRETE ICE
Breaking point 17.690 kilograms 9.525 kilograms
Melting point 45 MIN 25 MIN
12. Pykrete is economy to wood andPykrete is economy to wood and
concreteconcrete
We use waste wood in pykreteWe use waste wood in pykrete
Pykrete is Bullet proof to the icePykrete is Bullet proof to the ice
On site manufacturingOn site manufacturing
Convert into countless shapeConvert into countless shape
Time savingTime saving
It is light weight as compare concreteIt is light weight as compare concrete
and woodand wood