United States Government Specification for Liquid Paint Drier
United States Government Specification for Liquid Paint Drier
United States Interdepartmental Committee On Pain
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Thoroughly clean a glass plate, finally washing with benzol and drying. Pour a portion of the mixture of linseed oil and drier over this plate and place the plate in a vertical position in a well- ventilated room, the atmosphere of which is free from products of combustion or laboratory fumes. Allow the remainder of the mixture to stand for 2 hours. No sediment or precipitate should appear. At i-hour intervals examine the film of oil on the plate by touching it lightly with the finger at points... not less than 2. 5 cm (i inch) from the edges. If the film still has the greasy feel of fresh linseed oil, it has not set to touch. If the film feels tacky and adheres to the finger, it is considered to have set to touch. If the finger can be drawn lightly across the film with- out the oil sticking to the finger or the surface being marred by this treatment, the oil is considered dry. In case the test shows time of setting to touch or drying greater than 8 and 18 hours, respectively, a second test shall be run on a different day and the average of the two tests taken.
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