Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Technologies
- Product Families
Features & Benefits
- Ready-to-Use Product Features
Applications & Uses
- Markets
- Cure Method
- Application Details
Encapsulation of sensitive electronic components such as hybrid elements with wire-bonded chips.
Processing
Surface preparation:
All surfaces must be clean and free of contaminants that will inhibit the cure of SEMICOSIL® 920 LT A/B. 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
Only components A and B with the same lot number may be processed together. Component A of SEMICOSIL® 920 LT A/B contains the platinum catalyst, component B the crosslinker. Even traces of the platinum catalyst may cause gelling of the component containing the crosslinker. To eliminate any air introduced during dispensing or trapped under components or devices a vacuum encapsulation is recommended.
Curing
The curing time of addition-curing silicone rubber is highly dependent on temperature, size and heat sink properties of the component being potted.
Temperature Curing time, thickness 10 mm
100 °C 30 min 130 °C 20 min 150 °C 10 min
Properties
- Physical Form
- Catalyst Properties
- Cured Properties
- Uncured Properties
- Properties
- Two-part, 1 : 1 mixing ratio
- Very low viscosity
- Fast cure
- Forms a soft gel on vulcanization
- Almost constant properties between -100 °C and +200 °C
- Low ion content
- Note
Cured properties are cured at 150 °C for 60 min. in a vented oven.
| Value | Units | Test Method / Conditions | |
| Dynamic Viscosity (A+B, at 25°C) | 420 | mPa·s | ISO 3219 |
| Gel Time (A+B, at 70°C) | 5 | minutes | EN ISO 9396 |
| Mix Ratio (A:B) | 1:1 | parts by weight | — |
| Platinum Catalyst in Component (A+B) | Component A | — | — |
| Pot Life (A+B, at 23°C, Viscosity up to 1.000 mPa.s (Brookfield)) | 20 | minutes | DIN EN ISO 2555 |
| Pot Life (A+B, at 23°C, Viscosity up to 20.000 mPa.s (Brookfield)) | min. 100 | minutes | DIN EN ISO 2555 |
| Value | Units | Test Method / Conditions | |
| Density (at 23°C) | 0.98 | g/cm³ | DIN EN ISO 1183-1 A |
| Penetration (quarter cone, 9.38g, 5sec) | 3 | mm | DIN ISO 2137 |
| Value | Units | Test Method / Conditions | |
| Density (at 23°C, Componenet A) | 0.98 | g/cm³ | DIN EN ISO 2811-1 |
| Density (at 23°C, Componenet B) | 0.98 | g/cm³ | DIN EN ISO 2811-1 |
| Dynamic Viscosity (at 25°C, Component A) | 500 | mPa·s | ISO 3219 |
| Dynamic Viscosity (at 25°C, Component B) | 400 | mPa·s | ISO 3219 |
Regulatory & Compliance
- Certifications & Compliance
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Packaging & Availability
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Storage & Handling
- Storage Information
SEMICOSIL® 920 LT A/B should be stored between 5 °C and 30 °C in the tightly closed original container.