A drop ball impact method have been applied for determining the sensitivity of oxidizer - red phosphorus contact mixtures. The direct impact of a sample by the ball gave lower 50% explosion height than other methods using indirect impact through a steel cylinder or striker etc. The energy (E₅₀) of 50% explosion probability for the sensitive composition was expressed by the E₅₀ for direct drop ball method and listed in the table.
Bromates, chlorates, or chlorites gave extremely sensitive contact mixtures with red phosphorus. Especially, silver chlorate - red phosphorus mixture showed the most sensitive in this work. The experimental of a series of metal peroxides - red phosphorus mixtures distinguished two distinct groups of different sensitivity. The mixture of sodium or potassium peroxide with red phosphorus was very highly sensitive, the second group included Zn, Ba, Ca, Sr, or Mg peroxide were observed forming less sensitive mixture and the energy (E₅₀) of impact explosion was 0.32-0.88 J. The mixture of perchlorates or iodates with red phosphorus gave comparable sensitivity to the explosives alone, namely, Pb(N₃)₂, DDNP, PETN, RDX, or HMX etc.
The E₅₀ was compared with the specified quantities of hazardous materials by the Japanese Fire Prevention Law and with the packing group of dangerous goods recommended by the United Nations.

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酸化剤一可燃物接触混合物の打撃感度を可変落球重量の落球式打撃感度試験機を用いて測定した.打撃感度は50％爆点における落高エネルギーE5。で表すことができた、酸化剤との接触混合物に使用した赤リン，硫黄，エチレングリコール，ケィカン石，アルミニウム，マグネシウム等の可燃物のうち，赤リンが最も高い打撃感度を示した．落球式打撃感度試験と落っい式打撃感度試験で得られたデータの相関関係式を導き，落つい式打撃感度試験で得られたデータを含め，多くの酸化剤呵燃物接触混合物の打撃感度の序列を得ることができた．

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Some reactive materials, such as oxidizing materials, become less hazardous when they are shaped. In this report, we tried some methods to evaluate burning and explosion hazards of the shaped materials.
To evaluate the hazard of shaped materials requires bigger sample size than that of powdery materials. So we made some preliminary experiments for the mixture of the high strength calcium hypochlorite (HCH) tablets and the mixture of the standard materials to avoid occurrence of burning or explosion accidents. The results of the experiments showed that the mixture of the HCH tablets and a fuel for the detonation propagation test had sufficient stability and the mixture for the burning rate test had no ability to propagate a detonation. And referring to the results, the mixing ratios of the standard materials and the fuel for the tests were decided.
The detonation propagation test showed that the sample mixture had no ability to propagate a detonation, and the burning rate test showed that the sample mixture did not sustain a burning.

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感度の高い酸化剤一赤リン接触混合物に落槌試験を適用してその混合物の落槌感度の序列を調べた、安全上の理由から，混合操作なしの小試料接触混合物を用いた。広範囲にわたる打撃感度を測定するためにいくつかの試料保持部分の集合体を工夫した， 酸化剤一赤リン混合物の感度を成分酸化剤の構成から分類することは困難であった．しかし，臭素酸塩，塩素酸塩，次亜塩素酸塩および過酸化ナトリウムを含む混合物がこの研究で試験した試料のなかでは高い感度を示した．試験した全混合物の感度をジュール単位の落槌のエネルギーで表して図示した．

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