2 Inert gas technology
Components
Page
2 - 4
MB-20-G/MB-200G-W_MB-LABmaster_MB-200 MOD_TP700
Operating Manual - V5.0 - 04/2018 - STD
Specification:
Property Standard gloves
Temperature range -40 °C … +90 °C
Permeability (P) of Butyl: In units of
where “min” = minutes
O
2
5.86
H
2
O 495.00
Chemical resistance Suitable for use with acids and bases (for more inform-
ation, contact MBRAUN)
For higher temperature ranges, butyl gloves with a hypalon coating are available.
Permeability (P):
The time-dependent gas volume of a defined gas (the permeant) which diffuses
through a solid of thickness d with an exposed surface A, driven by a pressure gradient
∆p at a temperature of 25°C, depends on the constant P.
P = Permeation coefficient (= permeability)
V = gas volume, t = time, p = pressure, d = thickness, A = exposed surface of the ma-
terial
P depends on the gas (permeant) and the material
MBRAUN standard gloves are made of butyl rubber (IIR), size 8 1/2, thickness 0.3 mm.
Based on this data, and if the partial pressure inside is close to zero, the permeation volu-
metric flow for a new glove is as follows:
4
¡ H
2
O: 6.49 cm
3
h
-1
(H
2
O partial pressure of ambient atmosphere ∆p = 20 mbar at 25°C and 60% r. H.
Partial pressure inside is close to zero).
¡ O
2
: 0.78 cm
3
h
-1
(O
2
partial pressure of ambient atmosphere ∆p = 209 mbar. Partial pressure inside is
close to zero)
4
K. Koch, Calculation of Oxygen permeation through polymer materials, 2011
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