The amount of a material required to provide a coating can be estimated based on the item to be coated and the desired thickness of the coating.
There are 2 approaches to determine the volume required:
(1) calculate the surface area then multiply by the thickness of the coat
(2) calculate the volume of the object with and without the coating and then subtract the latter from the former
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Shape
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Formula for Area
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Variables
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rectangle (one side)
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a * b
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a, b = lengths of sides
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circle (one side)
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π * (R^2)
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R = radius
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volume required =
= (surface area) * (thickness of coat)
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Shape
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Formula for Volume
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Variables
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box
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a * b * c
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a, b, c = lengths of sides
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cylinder
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π * (R^2) * h
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R = radius of base
h = height or length
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sphere
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4/3 * π * (R^3)
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R = radius
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volume required =
= (volume of shape with coating) - (volume of shape without coating)
where:
• The sides of the box will increase by the 2 times the thickness of the coating.
• The volume required for a cylinder depends on whether the circular ends are to be covered.
