Emplastrum Plumbi. Lead Plaster. This is lead oleate, and is sometimes called Diachylon Plaster. Lead Oxide, 3200, is boiled in water, and Olive Oil, 6000. When the mass has acquired a whitish color and is perfectly homogeneous, it is well kneaded to remove the Glycerin and divided into rolls of suitable size. 3PbO+ 3H2O+2(C3H5(C18H33O2)3)=3(Pb2(C18H33O2)2)+2(C3H5(OH)3).

Lead Oxide or its Plaster is contained in Emplastrum Ammoniaci cum Hydrargyro, Ferri, Hydrargyri, Opii, Resinae, and Saponis.