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People ask all the time about how waterproofing something is, how to waterproof clothing yourself or what exactly the numbers mean. Here is a short explanation (from what I know):
1. What does that number mean? Well, the number given, like 10,000 mm, is the size of molecule that can get through the material. The actual cloth of the jacket is woven together with a certain 'tightness'. The tighter weave and the stronger the material, the less will be able to get through the 'pores'. The number given is saying that any molecule or compound smaller than that number will be not able to get through, so to speak. So, if somethign is 10,000 mm, a 8,000 mm snow molecule will not get through. Crap, I have to go to class. In short, waterproofing something seals these pores in the jacket, creating no space for water to get through.
I dream of winter.
ok dude if u knew something thatd be real helpful but thats not since a 10,000mm water particle is also equal to a 10m one... which in most ppls mind is a a tank of water... so if that can get through then... well u see where im going with this. the #s have to do with the pressure of a column of water placed on the material... here to quote asp541 from ski gabber:
Waterproofing is measured in millimeters of pressure. Let's say you stretch out the fabric and place a large tube with water on top, then a fabric with a waterproofing of 5000 (mm) can withstand water from a tube that's 5 meters long (that's a little more than 5 yards for you non-metric morons).
Another thing is 'breathability':
Measured in 'gram per squaremeter per 24 hours'.
Let's say you get a one squaremeter piece of fabric. You stretch it out over a big container of water. You then measure the amount of grams of evaporated water over 24 hours. So if you have a breathability of 4000, it means that it will allow 4000 grams of water to evaporate in 24 hours (that's 4 liters). Usually fabric with a breathability of 2000 and above is 'breathable'.
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