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Identification & Functionality
- Chemical Family
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Features & Benefits
- Materials Features
- Ready-to-Use Product Features
Applications & Uses
- Markets
- Cure Method
- Application Details
Encapsulation of electronic components for the automotive and power electronics industries.
Surface preparation
- All surfaces must be clean and free of contaminants that will inhibit the cure of SEMICOSIL® 917.
- 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
- SEMICOSIL 917 contains the crosslinker, ELASTOSIL CAT PT, PT-F, UV and SEMICOSIL 950 UV contains the catalyst. Even traces of the platinum catalyst may cause gelling of the component containing the crosslinker.
- Therefore tools (spatula, stirrers, etc.) used for handling the catalyst-containing component or the catalyzed compound must not come into contact with this component. The two components should be thoroughly mixed at a 10 : 1 ratio by weight or volume.
- To eliminate any air introduced during dispensing or trapped under components or devices a vacuum encapsulation is recommended.
Curing
- The system SEMICOSIL® 917 / ELASTOSIL® CAT UV (10:1) is activated by direct UV irradiation. UV irradiation should use emissions in the wavelength range between 250 and 350 nm. Typically D-bulbs (Fe-doped Hg-light sources) using ozone-free quartz should be used and are commercially available.
- H-bulbs with emissions below 250 nm are not recommended. Curing time of the UV-active system SEMICOSIL® 917 / ELASTOSIL® CAT UV (10:1) is highly dependent both on the intensity and dose of the UV light and the spectral intensity distribution.
- The curing is also dependent on the layer thickness, the optical properties of the substrate and temperature. Increase of the temperature will fasten curing reaction. SEMICOSIL® 917 / ELASTOSIL® CAT UV (10:1) will only cure in directly irradiated areas.
- The combination SEMICOSIL® 917 / SEMICOSIL® 950 UV B features same UV reactivity, but additionally ensures that the silicone also can be cured in shadow areas which are not directly irradiated with light. For fast cure a vented oven can be used.
Over Temperature 100 °C Curing time, 2mm
Catalyst PT 5 min Catalyst PT-F 2 min Catalyst UV # 0.5 - 5 min SEMICOSIL® 950 UV B # 0.5 - 5 min #Only UV irradiation at 23°C: UV dose 1.4 J/cm², 250-350nm
Properties
- Physical Form
- Catalyst Properties
- Cured Properties
- Uncured Properties
- Properties
- 10 : 1 mixing ratio
- Shear-thinning
- Fast curing at room temperature with Catalyst PT-F
- Long pot life at room temperature with Catalyst PT
- Extremely fast curing with Catalyst UV
- Shadow cure with SEMICOSIL® 950 UV B
- Low Hardness
- Pronounced tackiness
- Cured properties independent on catalyst
- UV tracer for automated visual inspection
- Note
- Mixing ratio (SEMICOSIL® 917 : catalyst) = 10:1 for catalyzed properties.
- Cured Properties are cured at 150°C for 30 min.
| Value | Units | Test Method / Conditions | |
| Dynamic Viscosity (catalyzed with ELASTOSIL® CAT UV, without UV-irradiation, at 25°C, Shear rate 0.5 s⁻¹) | 12000 | mPa·s | DIN 53019 |
| Dynamic Viscosity (catalyzed with ELASTOSIL® CAT UV, without UV-irradiation, at 25°C, Shear rate 100 s⁻¹) | 1700 | mPa·s | DIN 53019 |
| Gel Time (catalyzed with ELASTOSIL® CAT PT-F, at 23°C) | 15 | minutes | DIN 16945 |
| Gel Time (catalyzed with ELASTOSIL® CAT PT-F, at 50°C) | 3 | minutes | DIN 16945 |
| Gel Time (catalyzed with ELASTOSIL® CAT PT, at 23°C) | 4.5 | hours | DIN 16945 |
| Gel Time (catalyzed with ELASTOSIL® CAT PT, at 50°C) | 30 | minutes | DIN 16945 |
| Gel Time (catalyzed with ELASTOSIL® CAT UV, at 23°C ( UV dose: 1.4 J/cm², 250-350 nm (10 sec. at 140 mW/cm²), 1 cm thickness)) | max. 200 | seconds | DIN 16945 |
| Gel Time (catalyzed with SEMICOSIL® 950 UV B, at 120°C, without UV-irradiation) | 40 - 180 | seconds | DIN 16945 |
| Gel Time (catalyzed with SEMICOSIL® 950 UV B, at 23°C ( UV dose 1.4 J/cm², 250-350 nm (10 sec. at 140 mW/cm²), 1 cm thickness)) | max. 200 | seconds | DIN 16945 |
| Gel Time (catalyzed with SEMICOSIL® 950 UV B, at 23°C, without UV-irradiation) | 40 | minutes | DIN 16945 |
| Gel Time (catalyzed with SEMICOSIL® 950 UV B, at 50°C, without UV-irradiation) | max. 10 | minutes | DIN 16945 |
| Pot Life (at 23°C, catalyzed with ELASTOSIL® CAT PT-F) | 5 | minutes | — |
| Pot Life (at 23°C, catalyzed with ELASTOSIL® CAT PT) | 2 | hours | — |
| Pot Life (at 23°C, catalyzed with ELASTOSIL® CAT UV, without UV-irradiation) | min. 1 | days | — |
| Pot Life (at 23°C, catalyzed with SEMICOSIL® 950 UV B, without UV-irradiation) | 20 | minutes | — |
| Value | Units | Test Method / Conditions | |
| Density (at 23°C) | 0.98 | g/cm³ | DIN EN ISO 1183-1 A |
| Penetration (9.38g hollow cone, 5 sec) | 5.5 | mm | DIN ISO 2137 |
| Value | Units | Test Method / Conditions | |
| Density (at 23°C) | 0.98 | g/cm³ | DIN EN ISO 2811-1 |
| Dynamic Viscosity (at 25°C, Shear rate 0.5 s⁻¹) | 13000 | mPa·s | DIN 53019 |
| Dynamic Viscosity (at 25°C, Shear rate 100 s⁻¹) | 1700 | mPa·s | DIN 53019 |
Regulatory & Compliance
- Certifications & Compliance
Safety & Health
- Safety Note
According to the latest findings, the addition-curing silicone rubber SEMICOSIL® 917 contains neither toxic nor aggressive substances which would require special handling precautions. General industrial hygiene regulations should be observed.
Packaging & Availability
- Country Availability
- Regional Availability
Storage & Handling
- Storage Information
SEMICOSIL® 917 should be stored dry and cool in the tightly closed original container.