※ 引述《iceveil (so far so good)》之銘言：
: 查了一下
: 第一個PSI指的應該是防水程度 數字越大指可以承受的水壓越強
: Ret就大有來頭了 一個德國的測試中心訂出來的標準
: Hohenstein Institute www.hohenstein.de
: "resistance to water vapor transfer" (Ret) 主要是測試布料"阻止"水汽通過的能力
: 所以數值越低代表透氣度越好
: 大概的標準如下
: Ret less than or equal to 60 - Very Good
: Ret greater than 60 but less than or equal to 130 - Good
: Ret greater than 130 but less than or equal to 200 - Satisfactory
: Ret greater than 200 - Unsatisfactory
: CFM大概是防風能力 0就是完全抗風
: 如有錯誤 歡迎糾正囉~~~~
from www.marmot.com -> Technology -> Windproof Technology
How is windproofness measured?
The most common method is called the Fraser-o-meter or Fraser Air
Permeability Test. This measures the number of cubic feet of air
that can pass thru a square foot of fabric in one minute at a pressure
differential equal to 30 miles per hour wind speed. The results are
given in cfm – cubic feet per minute.
稍微翻譯一下, 就是我們最常用的測量防風的方法, 就是Fraser-o-meter法,
在一塊一平方呎的測量物體兩邊, 給予相當於每小時30英哩風速的氣壓差,
然後測量通過這塊測量材料的空氣量有多少, 單位是 立方英呎/分鐘 .
WindStopper 0 cfm
DriClime Windshirt 3-5 cfm
Power Shield 10-20 cfm
Wind Pro 60 cfm
200 weight Fleece 200 cfm
小馬
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