But, isn’t .048 inch 48 mils? Divide that by four and you get 12 mils.
If you were measuring 40 thicknesses, got a reading of .048, then divided by 40 you’d get 1.2 mils. I think.
The reading Lance got checks out, .003 inch, or three mils, for four layers, or .75 mil per layer.
Feel free to check my math guys!
- Isn’t math fun?
David, I have what looks to be the very same El Cheapo harbor freight digital calipers, which I got for ammo reloading. I was trying to read the thickness of my Frost King interior kit with it last night and I repeatedly got .002 inch, or 2 mils for one thickness of the material. I’m quite sure that is very wrong.
I gotta say that after checking this calipers I do not trust them one bit, especially for such small measurements. It's fine for overall cartridge length, maybe even bullet and bore diameter, but I don’t think that instrument is up to the Polycryo challenge!
By the by, the plastic sheeting alone from my Frost King interior 84” by 110” kit weighs exactly four ounces on an El Cheapo on-sale-at-wal-mart digital kitchen scale ( Not exactly NIST traceable ). I’d be curious to know the weight of the same size exterior kit.
Anyway, we can conclude that some folk use the thinner interior kits and some folk use the stouter exterior kits, and they all seem to work well enough?
Edited to add - I had two inches of fresh snow on my tarp this morning. It was sagging, but holding...
It will be interesting to see if it is still staying up tonight when I get home.
Also, I see the silver duct tape isn't recomended?
Why? It seems to be holding well enough on my tarp, so far anyway.