ELASTOSIL® M 4511
Room Temperature Curing Silicone Rubber (RTV-2)
Pourable, condensation-curing, two-component silicone rubber that
vulcanizes at room temperature.
Main application: Making cost effective molds, specially suited for casting
PE and PU resins.
Properties
• very good flowability and self-deaeration
• very low Shore A hardness (approx. 12)
• high tear strength
• extremely high elongation and flexibility
• outstanding chemical resistance to attack by polyester and polyurethane resins, mold life is significantly extended
Specific features
• Condensation-curing
• Flowable
• Resistance against polyester
• Resistance against PU
• Two-component
Technical data
Applications
• Reproduction Molding
Application details
ELASTOSIL® M 4511 is a high-performance moldmaking compound, which is particularly suitable for the reproduction of
models with extensive undercuts. ELASTOSIL® M 4511 is especially suitable for the processing of polyester and
polyurethane resins.
Due to its very high extensibility and low flexural modulus, ELASTOSIL® M 4511 is best suited for the reproduction of fine or
fragile models, where the piece may be damaged by more rigid molding materials on demolding.
ELASTOSIL® M 4511 exhibits low hardness and high strength, plus excellent ink transfer characteristics. These make it a
perfect base material for the production of printing pads.
Processing
If molds for processing epoxy or polyurethane resins are to be made,
ELASTOSIL M 4511 is cured by adding 5 wt % Catalyst T 21.
For molds used to process other reproduction materials such as polyester resins, plaster, concrete, synthetic stone, wax or low-melting alloys, 5 wt % Catalyst T 51 should be used. Pot lifes and curing times of both catalysts may be accelerated, and thus adjusted to suit the individual application by blending with Catalyst T 47.
For faster curing either catalyst may be blended with Catalyst T 47. E.g. at a ratio of 95 : 5 (T51 : T47) the pot life decreases to about 30 min, and the mold needs only about 4 h to cure.
Further instructions on blending any catalyst with Catalyst T 47 may be found in our data-sheet: “WACKER® T-series catalysts”.
The pot life is the period of time at 23 °C / 50 % rel. humidity during which the catalyzed mix to attain a viscosity of 100,000 mPa s and still be just
pourable.
Please check also our brochures and info sheets.
Packaging and storage
Storage
The ‘Best use before end’ date of each batch is shown on the product label.
Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable. In this case
however, the properties required for the intended use must be checked for quality assurance reasons.
Safety notes
Being a condensation-curing silicone rubber, ELASTOSIL® M 4511 contains only constituents that over many years have
proved to be neither toxic nor aggressive. Special handling precautions are therefore not required, i.e., only the general
industrial hygiene regulations apply.
Catalysts T 21, T 51 and T 47 contain organotin compounds, are flammable (flash points 50 °C) and may cause irritation in
contact with eyes and skin. Adequate protective measures are required.
Comprehensive instructions are given in the corresponding Material Safety Data Sheets. They are available on request from
WACKER subsidiaries or may be printed via WACKER web site http://www.wacker.com.