item

unit

standard

Test method

average

Basic weight

g/m²

50±1.5

ISO9073.1

Thickness

mm

≥0.20

ISO9073.2

Breaking Tenacity

MD  

N/50mm

≥180

ISO9073.3

CD  

≥82

Ultimate Elongation 

MD  

%

≥72

CD  

≥78

Flexibility

MD

mm

≤60

ISO9073.7

CD

mm

≤45

Ventilation Property 

L/m².s

    ≥1220

ISO9237

Hydrostatic Pressure 

 mmH2O

   ≥800

ISO811