M69 incendiary M69 incendiary The M69 incendiary bomblet was used in air raids on Japan and China during World War II. They were nicknamed "Tokyo calling cards". The M69 was a plain steel pipe with a hexagonal cross section in diameter and long. It weighed about . The bomblet used napalm (jelled gasoline) as an incendiary filler, improving on earlier designs which used thermite or magnesium fillers that burned more intensely, but were less energy- and weight-efficient, and were easier to extinguish. In Germany they were filled with jellied oil and dropped in clusters of 36 in the non-aerodynamic M19 bomb. Over
Copper naphthenate adhesion promoters, lubricant additives, and catalysts where oil solubility is required. Naphthenic acid is a complex group of carboxylic acids with the general formula CHO where n indicates the carbon number and z specifies the hydrogen deficiency resulting from ring formation. Naphthenic acids occur naturally in crude oil at varying concentrations, and their composition varies with the crude oil composition and the conditions during refining. Crude oils with total acid number (TAN) as little as 0.5 mg KOH/g acid or petroleum fractions greater than about 1.0 mg KOH/g oil usually qualify as a high acid crude or oil. At the