I found a conversion (mm/ gauge) for sheet metal (ferrous and nonferrous) but I can't seem to find a way to convert plastic thicknesses between "mil", "mm" and "gauge". Each brand seems to use their own unit - making it impossible to compare. Your help would be most appreciated.
plastic thickness - mil/ mm/ gauge
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Re: plastic thickness - mil/ mm/ gauge
Plastic gauge is expressed in microns (abreviation um or mym)
1 um = 0.0254mm.
If (as in USA) film thickness is 3mil (mm) then this is 3 divided by 0.0254 = 118.11um. As with most extrusion this is generally called 120um given manufacturing tolerance +/- 5%.
Most accurate gauge is calculated by weight i.e. specific gravity for LDPE is .92.
However in most cases nominal gauge is more than suitable for general use.
Yeild can be calculated for say plastic layflat tube (thats 2 thicknesses) by using width (mm) x gauge (um) x factor (LDPE = .00184 & HDPE = .00194) to give weight (kg) for 1000 lin. meters.
950mm x 80um x .00184 = 139.84kg/1000 mtr.
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Re: plastic thickness - mil/ mm/ gauge
Originally posted by ConfusedThe conversion above seems confusing. I am just tring to convert mm to mil (film thickness). Would mil be the same as micron?
1 millimeter = 39.3700787401575 mil
To do it by hand:
mm * 39.37 = mil
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Re: plastic thickness - mil/ mm/ gauge
A caution for thickness - in metric countires, "mil" is also a lazy way of saying "millimeter". Thus 2mil - 2mm. We don't use "mil" at all, we use "thou" as in 3thou = 3 thousanths of an inch. Check what it means where you come from.
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Re: plastic thickness - mil/ mm/ gauge
I'm having a similar issue. I'm in Mexico. Buying rolls of plastic sheeting everyone retail refers to gauge as between 6 to 16 with 10 and 12 being very common. I've been trying to buy some a bit thicker and went to a distributor in Mexico City where they sell rolls by the kilo in widths of about 4.5 feet. Suddenly they're talking about 150 and up to 500. They said they thought probably 200 was roughly equavalent to 22 gauge. To be more precise what units of measure do you think I need to be using to do a conversion from 22 gauge (called here calibre) to something in the low hundreds range.
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Re: plastic thickness - mil/ mm/ gauge
Originally posted by UnregisteredHow much would be 250 microns in guage ??
250 microns * 4 = 1,000 guage (give or take).
Not 100% certain, but pretty sure. Maybe someone can approve this?
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