User Manual SERVOPRO PLASMA Trace N
2
Analyzer
APPENDIX 1 57
The following table gives some permeation factors of the most commonly used so-called
"plastic tubing".
PERMEABILITY (approx.) AT 25
O
C
TUBING
FORMULATION
TYPE
PERMEABILITY (approx.)
Units :
cc mm
cm cm Hg
x
−
− −
−
sec
2
10
10
O
2
N
2
Gum rubber 171-307 80-118
NORPRENE food 80 200
Nylon 2.0-5.4 0.2-1.1
PHARMED
®
80 200
Polyethylene 3.6 0.09
Polypropylene 25 4
Polyurethane 10.5 17.1
PTFE 1.0
PVC (BUBBLE
®
) 1345
Reinforced PVC 0.13-36
Reinf. silicone, platinum 7961 2763
Reinf. silicone, peroxide 7961 2763
Silicone, platinum-cured 7961 2763
Silicone, peroxide-cured 7961 2763
TYGON, food/beverage 30 60
TYGON, fuel/lubricant 12 22
TYGON, high-purity 135 45
TYGON, lab vacuum 40 80
TYGON, ultra-resistant 980 350
Vinyl 40 80
VITON 13-15 4.3
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