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LUMISIL® 903 A/B is a silicone for transparent potting in the lighting and electronics industry.
Processing
Surface preparation:
- All surfaces must be clean and free of contaminants that will inhibit the cure of LUMISIL® 903. Examples of inhibiting contaminants are sulfur containing materials, plasticizers, urethanes, amine containing materials and organometallic compounds – especially organotin compounds.
- If a substrate’s ability to inhibit cure is unknown, a small scale test should be run to determine compatibility.
Mixing:
- Component A of LUMISIL® 903 contains the platinum catalyst, component B the crosslinker. Even traces of the platinum catalyst may cause curing of the component containing the crosslinker. Therefore tools (spatula, stirrers, etc.) used for handling the platinum-containing component or the catalyzed compound must not come into contact with this component. The two components should be thoroughly mixed at a 1:1 ratio by weight.
- To eliminate any air introduced during mixing or trapped under components or devices a vacuum de-airing under a vacuum of 10-20 mm mercury for 5-10 min is recommended.
Curing:
Curing time of addition-curing silicone rubber is highly dependent on temperature, silicone amount, size and heat sink properties of the substrate the silicone is applied on. We recommend running preliminary tests to optimize conditions for the particular application.
Temperature Curing time, thickness 6 mm
100 °C <60 min 165 °C 15 min
Properties
- Catalyst Properties
- Cured Properties
- Uncured Properties
- Properties
- Two-part, 1 : 1 mixing ratio
- Flowable
- Rapid heat curing
- Forms a highly transparent rubber on vulcanization
- Note
Cured properties are cured for 15 min at 165 °C.
| Value | Units | Test Method / Conditions | |
| Dynamic Viscosity (A+B, at 25°C, Shear rate 1 s⁻¹) | 6500 | mPa·s | DIN EN ISO 3219 |
| Gel Time (A+B, at 70°C) | 10 | minutes | DIN 16945 |
| Mix Ratio (A:B) | 1:1 | parts by weight | — |
| Platinum Catalyst in Component (A+B) | Component A | — | — |
| Pot Life (A+B, at 23°C) | min. 1 | hours | — |
| Value | Units | Test Method / Conditions | |
| Density (at 23°C) | 1.02 | g/cm³ | DIN EN ISO 1183-1 A |
| Elongation (at break, 23°C, t=2mm) | 100 | % | ISO 37 Type 1 |
| Refractive Index (nD²⁵, at 25°C) | 1.41 | — | — |
| Shore Hardness A | 55 | — | DIN ISO 48-4 |
| Tear Strength | 6 | N/mm | ASTM D 624 B |
| Tensile Strength (at 23°C, t=2mm) | 5 | N/mm² | ISO 37 Type 1 |
| Transmission (at 450 - 800 nm) | min. 90 | % | — |
| Transmission (at 450 - 800 nm) | min. 95 | % | — |
| Value | Units | Test Method / Conditions | |
| Density (at 23°C, Componenet A) | 1.02 | g/cm³ | DIN EN ISO 2811-2 |
| Density (at 23°C, Componenet B) | 1.03 | g/cm³ | DIN EN ISO 2811-2 |
| Dynamic Viscosity (Component A, at 25°C, Shear rate 1 s⁻¹) | 9000 | mPa·s | DIN EN ISO 3219 |
| Dynamic Viscosity (Component B, at 25°C, Shear rate 1 s⁻¹) | 4500 | mPa·s | DIN EN ISO 3219 |
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