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Lead is a through drier & is always used as active or top drier. It promotes hard & through drying throughout the film. When lead is used with cobalt or Calcium Octoate it is advisable to add Calcium Octoate first to eliminate possibility of Lead Octoate to react with unreacted pthalic anhydride of alkyd resin, which could form Lead Pthalate. In exterior paints & floor finishes Lead is used along with Manganese to produce tough & hard film. It is also used in Polyurethane finishes as auxiliary drier. Lead drier improves the drying time of double boiled linseed oil.
Lead in combination with cobalt & calcium are suggested, particularly for long oil alkyds lead is the most important drier. However some of the problems connected with lead driers such as sulfur staining & reaction with polybasic acids are overcome by inclusion of calcium drier. As lead is toxic in nature its usage toys & edible film packaging is to be avoided.
|Products||Color||Metal Content %
|Non Volatile at 120°C/Hr
(+ / - 5)
|Specific Gravity at 30°C
(+/ - 0.03)
|Viscosity at 30°C
(+ / - 3)