Heidolph Pump Heads - Manual (Page 69)

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69
Designation PharMed Silicone Viton
Advantages
Ideal for non-toxic and non-
haemolytic cell cultures and
tissues. Impervious to normal
light and UV radiation. The tube
can be welded, bonded and
formed. Very long life. Low gas
permeability.
Excellent bio-compatibility.
Practically no disassociation of
plasticizers and additives.
Neutral to smell and taste. Not
susceptible to mildew. Ideal for
low temperatures. Waterproof;
resistant to ozone, radiation and
sunlight. Does not warp. Silicon
peroxide; hot vulcanized.
Highly resistant to chemicals.
Excellent resistance to corrosive
media, solvents and oils at high
temperatures. Only slightly
pervious to gas.
Limitations
Additives may become
disassociated.
Unsuitable for concentrated
acids, solvents, oils, acids or
diluted caustic soda. Relatively
highly pervious to gas.
Limited life span.
Use with:
Acids
Lyes
Solvents
Pressure
Vacuum
Viscous media
Sterile media
good
good
unsuitable
good
excellent
good
excellent
under certain conditions
under certain conditions
unsuitable
satisfactory
good
satisfactory
excellent
excellent
excellent
varies, tests recommended
good
good
good
satisfactory
Temperature range -60 to +130 °C -50 to +230 °C -30 to +200 °C
Physical properties Thermoplastic elastomeron a
polypropylene basis with
plasticizers. Excellent tensile
strength. Opaque, beige.
Polydimethylsiloxane with sili-
ceous earth and silicone
additives. Translucent, white.
Excellent resistance to contact
pressure.
Fluorocarbon rubber, thermally
formed.
Viton B (67 fluorinated).
Opaque, black.
Complies with
standards
USP, Class VI
FDA21 CFR 177.2600
NSF (standard 51)
USP, Class VI
FDA21 CFR 177.2600
Permeability CO
2
H
2
O
2
N
2
450
-
75
29
20132
6579
7961
2763
76-79
-
13-15
4,3
Cleaning/sterilization Can be autoclaved without
ageing symptoms.
Can be cleaned with hot water
and suds. Use only soap
without oil additives; use no
synthetic detergents. Rinse
with distilled water. Can be
sterilized by autoclaving in a
moist atmosphere or with
gamma rays. Cannot be
sterilized with ethylene oxide.
Can be sterilized at 249°C in
16 hours in a circulating air
heating cabinet.
® ®