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Processing of
Keratherm Sealing Compounds
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Notes/Precautions
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Silicone sealing compounds
are physiologically safe |
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No irritation to the respiratory
system when used in sealing compounds |
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Avoid contact with skin |
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Silicone hardeners/curing
agents are physiologically safe |
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We recommend the use of
protective industrial ointment |
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Pre-treatment:
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| The parts should
be dry, clean and grease-free. |
| Preparation: |
| The silicone sealer
compounds contain filler materials which may show sedimentation,
depending on the storage temperature. |
| Mixing: |
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Kerafol's silicone sealing
compounds and their silicone curing agents (component B)
must be mixed in the prescribed proportions. After intensive
mixing with a suitable stirrer, the compound is immediately
ready for use.
The use of cartridges is
not recommended, since mixing of the components by a static
mixer can no longer be performed. During the mixing process
ensure that no air is brought into the material. Avoid long
standby times. Pay attention to the specified processing
times. Silicone compounds are moisture-sensitive. After mixing,
sealing compounds should always be evacuated for a period
of at least 10 minutes at less than 100 mbar.
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| Application: |
| The processing
time ranges from approx. 25 minutes up to 3 hours! The viscosity
will increase slightly during this time, so you should only
prepare as much material as you can process within this time.
If the silicone sealing compound will be processed by means
of doping equipment, then it is possible to adjust the processing
time with the aid of accelerators. Processing of the compound
beyond this time should be avoided since the processing conditions
will continuously change due to the curing process. (viscosity
increase, viscidity of the sealing compound, etc.) |
| Curing
Conditions: |
| 48 hours at room
temperature or max.1/2 hour at 80°C; refer also to the
curing times specified on the datasheets. The heating regime
for room temperature onwards should not climb faster than
5 K/min. When tempering or post-curing incompletely cured
sealing compound, entrapped air can expand and cause smoke
formation. It is therefore important to ensure that no bubbles
are formed during dispensing. When curing at room temperature,
please note that heat treatment can change the hardness slightly.
Silicone sealing compounds that have been cured at room temperature
should not be stressed mechanically and electrically before
approx. 4 days waiting time. |
| Shelf
Life: |
| At least 6 months
in original packaging. When opened, the contents should be
used as soon as possible since, due to the influence of humidity,
the reactivity of the material can diminish. |
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