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Posted by Terry on 10/3/2002, 1:01 am The area covered by any surface coating whether it is powder, solvent or waterborne is determined by four basic factors only: Knowing all these factors we can now determin the area covered (mileage) for any given surface coating. So what do you have to do? Statement: Colour has nothing to do with mileage because the manufacturer can add extra barium sulphate to any colour altering the specific gravity to whatever he desires. We await your comments
Dear Sir,
a) solids - this can be as high as 100% for powder or as low as 20% or even lower for liquids.
b) dry film weight in mils or microns -powder normally applied at 50-65 microns but can vary from 20-150 microns. Later technologies < 20 microns.
c) efficiency of application method - powder can be as high as 90% with a good recovery plant or <50% spraying to waste.liquid can vary with application i.e. air assisted spray 50%, dipping 75% even brushing a paint onto a substrate has losses.
The paint left in the can and on the brush all count towards the overall efficiency. Dipping -consider the paint build up on the tank walls and on the drip tray.
d)specific gravity.
To save time I have developed a "Universal Mileage Calculator" using "Microsoft Excel" which will calculate the area covered for any give product. This will be offered on a free no guarantee or warranty basis and is offered as seen. However we require a couple of people to evaluate the calculations and the ideas behind the programme. The modulator has offered to translate it into "Hindi" - any other offers?. We will include your name within the page (no payments) for this help.
Just enter four figures a solids content 1-100%, efficiency factor 1-100%, specific gravity and film weight applied or required in mils or microns.
Immediatly you are given the area coverage in sqft/lb, sqft/kilo, sqmt/kilo and if its liquid sq ft or sq mt per litre.
Low film weight powder is what is states - it will give good opacity at low film weights. Aplication techniques good or bad, low Kv, high Kv - spraying to waste or not are covered by the efficiency factor.
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