Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Polymer Name
- Technologies
- Product Families
Features & Benefits
- Materials Features
- Special Features
- Addition-curing
- Excellent mechanical properties
- No shrinkage
- Two-component
Applications & Uses
- Markets
- Compatible Polymers & Resins
- Cure Method
- Plastics & Elastomers End Uses
- Applications
- Making shrink-free molds with excellent reproduction accuracy.
- Reproduction Molding for Foundry, Arts and Handicrafts.
- Composite molding.
- Application Details
Due to its outstanding resistance to casting resins as well as its superior mechanical properties ELASTOSIL® M 4642 A/B is perfectly suitable for all molds of models with undercuts that are to be reproduced in casting resins, and a certain inherent rigidity of the molds is required.
As a medium-Shore addition-curing RTV-2 silicone rubber that cures without undergoing dimensional shrinkage, ELASTOSIL® M 4642 A/B is also extremely suitable for casting all other common reproduction materials, particularly if absolutely accurate copies of models with undercuts are required.
Processing
Important note:
- The platinum catalyst is in component B.
- A and B components may only be used together if they have the same batch number.
Properties
- Catalyst Properties
- Cured Properties
- Uncured Properties
- Properties
- Very good flow
- Fast and non-shrink cure at room temperature which can be accelerated considerably by the application of heat.
- Medium shore A hardness
- High tear strength
- Long-term stability of the vulcanizate’s mechanical properties.
- Outstanding resistance to common casting resins.
- Note
Vulcanizate after 24 h at 23°C for Cured Properties
| Value | Units | Test Method / Conditions | |
| Curing Time (tack-free) | 12 | hours | — |
| Dynamic Viscosity (at 23°C) | 15000 | mPa·s | ISO 3219 |
| Mix Ratio (A:B) | 10:1 | parts by weight | — |
| Pot Life (at 23°C, up to 60000 mPa.s) | 90 | minutes | — |
| Value | Units | Test Method / Conditions | |
| Density (in water, at 23°C) | 1.14 | g/cm³ | ISO 2781 |
| Elongation (at break) | 480 | % | ISO 37 |
| Linear Shrinkage | max. 0.1 | % | — |
| Shore Hardness A | 37 | — | ISO 868 |
| Tear Strength | min. 30 | N/mm | ASTM D 624 B |
| Tensile Strength | 7 | N/mm² | ISO 37 |
| Value | Units | Test Method / Conditions | |
| Density (at 23°C, Componenet A) | 1.15 | g/cm³ | — |
| Density (at 23°C, Componenet B) | 1 | g/cm³ | — |
| Dynamic Viscosity (Component A, at 23°C, after stirring) | 20000 | mPa·s | ISO 3219 |
| Dynamic Viscosity (Component B, at 23°C, after stirring) | 700 | mPa·s | ISO 3219 |
Regulatory & Compliance
- Certifications & Compliance
Safety & Health
- Safety Note
Components of the addition-curing grade ELASTOSIL M 4642 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