Urea nitrate (UN) is known as an explosive material, but not used in practice.
Some sensitivity teats of UN were carried out. The friction sensitivity and the shock
sensitivity were low. The critical shock initiation pressure of UN (bulk density 0.68 )
was measured in card gap teat, and shown to be 2.2-2.6 GPa.
Detonation velocities of UN were measured in various cylindrical containers with
composition C-4 as a booster. It was clarified that the detonation velocity of UN
showed steady state detonation. Detonation velocity observed in a steel tube could be
over 5000 m/sec in adequate condition.
The effects of its density; diameter of charge and degree of confinement on
detonation velocity were proved. The properties of UN were shown to be explosive typeII
proposed by Donna Price.
硝酸尿素は，古くから爆発性化合物として知られているが，爆薬として実用化はされておらず，報告も少ない。そこで，感度や爆発性について調べたので報告する。
摩擦感度試験では JIS8 級，落槌感度試験では JIS7 級，衝撃起爆感度試験 (カードギャップ試験) においても最小起爆衝撃波圧力が 2.2〜2.6 GPa となり，感度はかなり低いことが明らかになった。
薬径や密度を変化させて爆速を測定したところ，いずれの条件においても一定爆速を示し，最大爆速は約5300 m/ｓ であった。密度効果や薬径効果から，硝酸尿素は Donna Price の提唱する �� 型の爆薬であると考えられる。