Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Polymer Name
- Technologies
- Product Families
Features & Benefits
- Materials Features
- Special Features
- Condensation-curing
- Heat resistant
- Low viscosity
- Two-component
Applications & Uses
- Markets
- Cure Method
- Plastics & Elastomers End Uses
- Applications
- Making molds for casting of low melting metal alloys.
- Reproduction Molding for Foundry, Arts and Handicrafts,
- Application Details
ELASTOSIL M 4470 is particularly suitable for molding applications in which high elongation and tear strength can be sacrificed in favor of excellent deformation resistance and thermal stability, e. g., for making molds of models of models with nor or only minor undercuts if good heat dissipation and high rigidity are required.
Typical applications are molds with:
- High rigidity for foaming resins (for foaming polyurethanes, it is advisable to use a barrier coat).
- High swelling resistance to components of casting resins, such as styrene in the case of polyesters.
- High thermal stability and heat dissipation for casting low-melting metal alloys.
Processing
- ELASTOSIL® M 4470 is cured by adding Catalyst T37 for long pot lives and curing times, or Catalyst T40 for short pot lives and curing times.
- Thin-walled molds are best suited for casting low-melting metal alloys (melting point: 300°C max.) and should be placed on a sheet of aluminum or other material with high thermal conductivity. Before the casting process, the old should be post-cured for a few hours at about 150 °C.
- In order to improve wetting by the molten metal, a thin layer of extremely fine silicon carbide, graphite powder or acetylene black should be applied to the mold surface.
- The first castings have normally to be discarded since the rubber still emits gasses, giving the surface of the casting a pockmarked appearance.
- The pot life is the period of time at 23°C, 50% relative humidity during which the catalyzed mix to attain a viscosity of 100,000 mPa s and still be just pourable.
Catalyst Paste T40
Pot Life, approx. [minutes]
Curing time (tack-free), approx.[h]
3% T37 90 20-40 2% T40 40 3-4
Properties
- Catalyst Properties
- Cured Properties
- Uncured Properties
- Properties
- Good flowability and self-deaeration
- High Shore A hardness
- Outstanding resistance to common casting resins
- Low viscosity
- Note
Catalyzed with 3 wt% Catalyst T 37, after 4 days at 23°C, 50% relative humidity for ctalyzed properties
| Value | Units | Test Method / Conditions | |
| Dynamic Viscosity (at 23°C) | 10000 | mPa·s | ISO 3219 |
| Value | Units | Test Method / Conditions | |
| Density (in water, at 23°C) | 1.44 | g/cm³ | ISO 2781 |
| Elongation (at break) | 120 | % | ISO 37 |
| Linear Shrinkage | 0.8 | % | — |
| Shore Hardness A | 60 | — | ISO 868 |
| Tear Strength | min. 4 | N/mm | ASTM D 624 B |
| Tensile Strength | 4.5 | N/mm² | ISO 37 |
| Value | Units | Test Method / Conditions | |
| Density (at 20°C, 1013 hPa) | approx. 1.44 | g/cm³ | DIN 53217 |
| Dynamic Viscosity (at 23°C, after stirring) | 15000 | mPa·s | ISO 3219 |
Regulatory & Compliance
- Certifications & Compliance
Safety & Health
- Safety Note
Being a condensation-curing silicone rubber, ELASTOSIL® M 4470 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 37 and T 40 contain a tetraorganotin compound, are flammable and may cause irritation in contact with eyes and skin. Adequate protective measures are required.
Packaging & Availability
- Country Availability
- Regional Availability