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#1
08-02-2006, 10:39 AM
 Unregistered Guest Posts: n/a
plastic thickness - mil/ mm/ gauge

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.
#2
09-11-2006, 03:25 AM
 Unregistered Guest Posts: n/a
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.
#3
09-11-2006, 11:53 AM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,467 Rep Power: 13
Re: plastic thickness - mil/ mm/ gauge

My research shows that for plastic film 1 gauge is equal to 0.01 mil, that would be 0.254 micron or 0.000254 millimeter.

guage * 0.01 = mil
mil / 0.01 = guage

mil * 0.0254 = millimeter
millimeter / 0.0254 = mil
#4
11-30-2006, 11:43 AM
 cst Guest Posts: n/a
Re: plastic thickness - mil/ mm/ gauge

I think the last 2 lines' operators should be backwards.
mil / 0.0254 = millimeter
millimeter * 0.0254 = mil

cheers
#5
11-30-2006, 09:12 PM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,467 Rep Power: 13
Re: plastic thickness - mil/ mm/ gauge

No they were right.

mil * 0.0254 = millimeter
millimeter / 0.0254 = mil

For example, if you have 100 mil:
100 mil * 0.0254 = 2.54 millimeter
#6
02-13-2007, 05:22 AM
 Unregistered Guest Posts: n/a
Re: plastic thickness - mil/ mm/ gauge

um sorry but what. I passed high school math barely. I'm tring to convert 13 "mil" to gauge. Sorry I don't understand the formula?
#7
02-14-2007, 11:01 PM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,467 Rep Power: 13
Re: plastic thickness - mil/ mm/ gauge

This is for plastic? Can you provide additional information?
#8
03-01-2007, 05:27 AM
 Confused Guest Posts: n/a
Re: plastic thickness - mil/ mm/ gauge

The conversion above seems confusing. I am just tring to convert mm to mil (film thickness). Would mil be the same as micron?
#9
03-01-2007, 10:06 AM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,467 Rep Power: 13
Re: plastic thickness - mil/ mm/ gauge

Quote:
 Originally Posted by Confused The conversion above seems confusing. I am just tring to convert mm to mil (film thickness). Would mil be the same as micron?
millimeter (mm) and mil are both units of length and can be converted easily on the Length conversion page.

1 millimeter = 39.3700787401575 mil

To do it by hand:

mm * 39.37 = mil
#10
08-15-2007, 05:51 PM
 Unregistered Guest Posts: n/a
Re: plastic thickness - mil/ mm/ gauge

does 20.3 mil strech wrap = 80 gauge ?

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