American Production
In August 1943, American experiments on the general problem of protection against shaped charges were initiated, and by October of that year a plastic armour much lighter than the steel armour required for the same amount of protection was found. This armour, made by the Flintkote Company, was improved through a series of tests, and a modified armour of pure quartz gravel in a mastic of pitch and wood flour was designated HCR2. Tests were also conducted to test plastic armour's ability to protect ships from torpedoes with shaped charge warheads, but this project was abandoned due to the low probability of these weapons becoming a serious threat, and protection of armoured fighting vehicles and concrete fortifications became the priorities.
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