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Rhodorsil® RTV-2's are two component room
temperature curing elastomers.
One wide range of RTV-2's is used
to produce moulds, together with polyurethane
elastomers, plasters, alginates and latex.
Another range is employed in healthcare, fully meeting the increasing
requirements of dentists, dental technicians, manufacturers of external breast prostheses and orthopedic soles. |
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RTV-2's have enabled new moulding techniques to be developed (e.g. very flexible sock moulds) and the moulding of very aggressive reproduction resins (polyurethanes, polyester, epoxies, etc.) access to translucent and transparent grades together with the appropriate mechanical properties have also enabled the development of vacuum prototype moulding.
This type of application covers a very broad ranging market, spanning from decorative moulding to industrial moulding. The Rhodorsil® RTV-2 range was developed with this in mind, to meet all these requirements.
Rhodorsil® RTV-2 silicone elastomers have specific properties which provide users with many advantages: |
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Flexibility |
simplified mould, gentle on model |
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Ease of Use |
no need for heavy equipment |
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Release Properties |
easy to demould |
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Tear strength |
thin section membranes,
complex shapes |
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Room temperature curing, no
heat
release |
no oven, gentle on model |
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Fine reproduction detail |
details to the nearest micron |
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Aging resistance |
reusing of stored moulds,
especially for polyaddition RTV-2's |
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Heat stability |
moulding of exothermic
reaction materials and low
melting point alloys |
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Dielectric properties |
use in HF moulding and
in galvanoplastics |
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Low shrinkage |
moulding accuracy |
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The Rhodorsil® RTV-2's have two different types. Each of these types has specific features which means it will be chosen according to the moulding technique and the user's requirements
1. Polycondensation type Rhodorsil® RTV-2; supplied as base and catalyst.
2. Polyaddition type Rhodorsil® RTV-2; supplied as part A and Part B. |
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POLYCONDENSATION (PC) |
POLYADDITION (PA) |
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Mixing Ratio |
100/2 to 100/10 |
100/10 to 100/100 |
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Safety precautions during mixing |
Requirements (glasses, gloves)
Preferably in a well ventilated area |
None |
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Pot life and
Demoulding time |
Variable depending on catalysis
Not heat accelerated |
Can be independent
Heat Accelerated |
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Risk of inhibition |
No |
Yes |
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Sensitive to reversion in
confined spaces |
Yes |
No |
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Shrinkage |
0.8 to 1.2% |
0.05 to 0.2% |
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Curing starts once the two components
are mixed at a rate that depends on the operating conditions.
The ideal conditions are:
- Temperature of 23°C
- Relative humidity of 50%
In order to comply with dimensions, it is preferable to use
- moderate temperatures 23 to 30°C and in any case no less than 20°C
- In and atmosphere that is not too dry (30%minimum)
- With the recommended catalyst dosage |
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