Mould-Making Compounds
Advantages
- excellent reproduction accuracy
- high elasticity
- excellent release properties
- easy to remove from the model
ELASTOSIL® M mould-making compounds from WACKER are room-temperature-vulcanizing silicone rubbers characterized by excellent reproduction accuracy. Thanks to their high elasticity and excellent release properties, vulcanizates made of ELASTOSIL® M are particularly easy to remove from the model. Depending on the curing system, ELASTOSIL® M mould-making compounds fall into two groups: condensation-curing silicones, which vulcanize with atmospheric moisture after a hardener is added, and addition-curing silicones, which vulcanize after a platinum catalyst is added.
RTV-2 condensation-curing
With condensation curing , component B (hardener) is added at a ratio of 2% to 5% of the corresponding component A. Curing releases a volatile alcohol compound as a by-product, which causes slight volume shrinkage.
Important: accelerating the cure by raising the temperature is not recommended. The vulcanizate may only be exposed to heat once the by-product has completely evaporated.
Advantages:
– No cure inhibition
– The vulcanization rate can be adjusted within a certain range by varying the amount of hardener or choosing a slow or fast hardener
– Excellent reproduction accuracy and outstanding release properties
Name*
Appearance
Colour
Hardness
[Shore A]
Linear shrinkage
(after 7 days) [%]
Elongation at break [%]
Viscosity before catalysing
(23 °C, Brookfield) [mPas]
RTV-2 addition-curing
For addition curing , a platinum-containing catalyst complex is required. Without releasing any by-product, it controls shrink-free vulcanization – contained in component A or B depending on the product. After processing, the curing rate can be accelerated considerably by applying heat.
Advantages:
– Reaction can be accelerated by raising the temperature
– Irreversible curing
– No weight loss during curing
– Sehr geringe Schrumpfungsrate (< 0,1 %)
– No release of by-products
– Excellent reproduction accuracy and outstanding release properties
Name*
Appearance
Colour
Hardness
[Shore A]
Elongation at break [%]
Viscosity
[mPa s]
Tear strength [N/mmA] [ASTM D 624]
ELASTOSIL® M 4615 A/B
pourable
translucent
13
700
7000
10
Downloads
WACKER product brochure “ELASTOSIL® M mould-making compounds made easy.” (German)
PDF, 2.1 MB | German
* These are typical properties; please refer to the technical data sheets for exact specifications.