Editing Plastic explosive (section)

===Composition C===
{{main article|Composition C|Composition C4}}
The British used a plastic explosive during World War II as a demolition charge. The specific explosive, Composition C, was 88.3% RDX and 11.7% non-oily, non-explosive plasticizer.<ref>{{cite web|url=https://maritime.org/doc/ordnance/index.htm |title=U.S. Explosive Ordnance, OP1664 |date=28 May 1947 |page=5 |publisher=San Francisco National Maritime Park Association |website=maritime.org |author=Department of the Navy, Bureau of Ordnance |access-date=12 June 2017}}</ref> The material was plastic between {{cvt|0|and(-)|40|C}}, but was brittle at colder temperatures and gummy at higher temperatures. Composition C was superseded by Composition C2, which used a mixture of 80% RDX and 20% plasticizer. Composition C2 had a wider temperature range at which it remained plastic, from {{cvt|−30|to|52|C}}. Composition C2 was replaced by Composition C3, which was a mixture of 77% RDX and 23% explosive plasticizer.<ref name="milex">{{cite book|title=Military Explosives|year=1989|url=https://books.google.com/books?id=ODYYAAAAYAAJ&q=plastic&pg=SA8-PA109}}</ref>{{rp|8–109}} C3 was effective but proved to be too brittle in cold weather and was replaced with C4. There are three classes of C4, with varying amounts of RDX and [[polyisobutylene]].<ref name="milex" />{{rp|8–111}}