The Study on the Hardness of Ointment (III) -Influences of Power on the Apparent Logarithmic Hardness of Ointments-

연고제(軟膏劑)의 경도(硬度)에 관한 연구(硏究)(III) -수종(數種)의 분말약제(粉末藥劑)가 연고제(軟膏劑)의 대수경도(對數硬度)에 미치는 영향(影響)-

The relationship between powders and apparent logarithmic hardness of ointments were clearly demonstrated. The followings were obtained as the results. 1. Apparent logarithmic hardness of ointment were affected by the powders such as zinc oxide, salicylic acid, soluble starch. and talc. 2. The ointments which are added powder have different two slops, $k_1\;and\;k_2$. 3. The slopes, $k_1\;and\;k_2$ were directly correlated and the critical points, were proportional to $k_1\;and\;k_2$ values. 4. The slope, ka is at least $6{\sim}91$ times more sensitive, than the slope, $k_1$, and 25 times more sensitive in average. It was suggested from the results that the quantity of powers which is added to the ointment must be within the critical point.