Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Polymer Name
- Technologies
- Product Families
Features & Benefits
- Materials Features
- Special Features
- Addition-curing
- BfR compliant
- FDA compliant
- Heat resistant
- Low viscosity
- No shrinkage
- Two-component
Applications & Uses
- Markets
- Cure Method
- Plastics & Elastomers End Uses
- Applications
- Silicone surface for printing rollers, making molds for casting low-melting metal alloys.
- Reproduction Molding
- Application Details
Being an addition-curing and thus a non-shrink vulcanizing rubber with high hardness, ELASTOSIL® M 4370 A/B is particularly suitable for molding applications in which high elongation and tear resistance can be sacrificed in favor of excellent deformation resistance and thermal stability, e. g., for making molds of models with nor or only minor undercuts if, in addition to absolute accuracy of reproduction, good heat dissipation and high rigidity are required.
Typical applications are molds with:
- High rigidity for foaming resins.
- 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
- Important note: The platinum catalyst is in component A.
- A and B components may only be used together if they have the same batch number.
- 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.
Properties
- Catalyst Properties
- Cured Properties
- Uncured Properties
- Properties
- Very good flowability and self-deaeration
- Fast and non-shrink cure at room temperature which can be accelerated considerably by the application of heat
- High hardness (Shore A approx. 55)
- Very good heat resistance
- Outstanding resistance to common casting resins
| Value | Units | Test Method / Conditions | |
| Curing Time (A+B, tack-free) | 6 | hours | — |
| Dynamic Viscosity (A+B, at 23°C) | 8000 | mPa·s | — |
| Mix Ratio (A:B) | 9:1 | parts by weight | — |
| Pot Life (A+B, up to 60,000 mPa.s) | 80 | minutes | — |
| Value | Units | Test Method / Conditions | |
| Density (at 23.0°C) | 1.43 | g/cm³ | ISO 2781 |
| Elongation (at break) | 130 | % | ISO 37 |
| Linear Shrinkage (after 24 hours, at 23°C) | max. 0.1 | % | — |
| Shore Hardness A | 55 | — | DIN ISO 48-4 |
| Tear Strength | min. 4 | N/mm | ASTM D 624 B |
| Tensile Strength | 3 | N/mm² | ISO 37 |
| Value | Units | Test Method / Conditions | |
| Density (at 23°C, Componenet A) | 1.5 | g/cm³ | — |
| Density (at 23°C, Componenet B) | 1.05 | g/cm³ | — |
| Dynamic Viscosity (Component A, after stirring) | 10000 | mPa·s | — |
| Dynamic Viscosity (Component B, after stirring) | 350 | mPa·s | — |
Regulatory & Compliance
- Certifications & Compliance
Safety & Health
- Safety Note
Components A and B of the addition-curing grade ELASTOSIL® M 4370 A/B contain 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.
Packaging & Availability
- Country Availability
- Regional Availability