The Five Basic Principles of Going Lighter ~ Cam "Swami" Honan of OZ
10 yes but at 20 I doubt anything goes through the fabric but I'm no expert on this.
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[QUOTE=T.S.Kobzol;2228243]Interesting.do you know what the number is for cuben fiber? Gore text jackets are usually around 10000mm and non breathable jackets around 20000mm
It depends on what type of Cuben Fiber ( now DCF) its used. There are dozens of different thicknesses and layer combinations.
There is a huge difference in the waterhead required for jackets compared with tents because the surface tension is compleately different.
An easy way to understand this is to think of the old canvass/cotton tents that kept water out as long as you do not touch the fabric itself from the inside. Once you do , they started dripping.
As mentioned, the EU standard for tent waterproofness is 1500mm, many well known brands have 1200mm for most of their LW shelters, some brands go as low as 800mm.
BTW, each type of material, say nylon,silnylon, polyester, silpoly,PTFE and so on, can have a very different waterhead rating.
So you can get silnylon rated at 800mm or so all the way up to over 5000mm. A common mistake is to equate weight with strength and or waterproofness.
The still popular Eureka Timberline, for example, 75 D polyester, at 6 lbs or so for a double , does have an advertised 800mm waterhead rating.
[QUOTE=T.S.Kobzol;2228243]Interesting.do you know what the number is for cuben fiber? Gore text jackets are usually around 10000mm and non breathable jackets around 20000mm
BTW, again, the tent posted by the OP is in polyester , not nylon.
75d polyester, in particular, can cost as little per square yard as 1/10th the cost of a decent 30d silnylon.