Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Technologies
- Product Families
Features & Benefits
- Labeling Claims
- Ready-to-Use Product Features
- Special Features
- Condensation-curing
- Electrically insulating
- Heat resistant
- Low viscosity
- Self-adhesive
- Steam resistant
- Two-component
- UV & weathering-resistant
Applications & Uses
- Applications
- Application Area
- Cure Method
- Applications
- E-Drives (xEV/EV)
- Machine Building
- Small Appliances
- White Goods
- Application Details
- General purpose sealing and potting grade
- Typical fields of application: household appliances, automotive, mechanical engineering, electrical industry.
Processing
Mixing and curing:
- ELASTOSIL® RT 772 is processed in combination with a curing agent, such as WACKER® Catalyst T 77 or WACKER® Catalyst T 77 PLUS. Prior to application the two compounds should be thoroughly mixed, either manually or by automatic metering lines equipped with static or dynamic mixing devices.
- The recommended mixing ratio is 10:1 by weight. Potlife and curing speed can be modified within limits by adjusting the ratio of base compound (ELASTOSIL® RT 772) to curing agent (WACKER® Catalyst T 77 or WACKER® Catalyst T 77 PLUS).
- Varying the mixing ratio between 8:1 and 12:1 usually has a small effect on the properties of the cured rubber. However, if the mixing ratio differs substantially from the recommended scope, preliminary tests should be carried out to check the cured material’s suitability.
- General information about pot life and resulting curing times are given in the respective tables "Catalyzed". Moreover curing speed can be slightly accelerated by raising the temperature. Heating, however, must not exceed 60 °C before curing is completed.
- After completion of the vulcanization process the product may continuously be exposed to constantly changing climatic conditions, UV radiation and very high temperature without damage. Cured ELASTOSIL® RT 772 usually shows good primerless adhesion to many substrates, e.g. glass, ceramics, metals, plastics and powder coatings.
Removal:
If removal of the silicone from machines or dispensing equipment is necessary, white spirit or similar nonpolar solvents are recommended. However, cleaning ideally should take place before the silicone is fully vulcanized. Cured silicone needs to be removed mechanically, if necessary in combination with a swelling agent (solvent).
Properties
- Flame Rating
- Typical Properties
- Catalyst Properties
- Cured Properties
- Uncured Properties
- Properties
Uncured:
- High extrusion rate
- Flowable
- Medium to fast curing at room temperature
- To be cured with WACKER® Catalyst T 77 or WACKER® Catalyst T 77 PLUS (recommended mixing ratio: 10:1).
Cured:
- Medium hardness
- Primerless adhesion to many substrates (glass, ceramics, metals, plastics and powder coatings).
- Outstanding heat resistance
- recommended service temperature range: -50 °C to +230 °C
- UL 94 HB listed (when cured with WACKER® Catalyst T 77).
- Note
Cured with WACKER Catalyst T 77 or WACKER Catalyst T 77 PLUS, mixing ratio 10:1 (by weight). Curing Conditions: 14 days at 23 °C and 50 % rel. humidity, 2 mm sheet, no post-curing for cured properties.
| Value | Units | Test Method / Conditions | |
| Recommended Service Temperature | -50 to +230 | °C | — |
| Value | Units | Test Method / Conditions | |
| Pot Life (Mixed with WACKER Catalyst T 77, 10:1, at 23°C) | 10 - 15 | minutes | DIN EN ISO 3219 |
| Pot Life (Mixed with WACKER Catalyst T 77 PLUS, 10:1, at 23°C) | 5 - 8 | minutes | DIN EN ISO 3219 |
| Pot Life (Mixed with WACKER Catalyst T 77, 12:1, at 23°C) | 15 - 20 | minutes | DIN EN ISO 3219 |
| Pot Life (Mixed with WACKER Catalyst T 77 PLUS, 12:1, at 23°C) | 8 - 10 | minutes | DIN EN ISO 3219 |
| Pot Life (Mixed with WACKER Catalyst T 77 PLUS, 8:1, at 23°C) | 3 - 5 | minutes | DIN EN ISO 3219 |
| Pot Life (Mixed with WACKER Catalyst T 77, 8:1, at 23°C) | 5 - 10 | minutes | DIN EN ISO 3219 |
| Tack-Free Time (Mixed with WACKER Catalyst T 77 PLUS, 10:1, at 23°C) | approx. 45 | minutes | — |
| Tack-Free Time (Mixed with WACKER Catalyst T 77, 10:1, at 23°C) | approx. 90 | minutes | — |
| Tack-Free Time (Mixed with WACKER Catalyst T 77 PLUS, 12:1, at 23°C) | 75 | minutes | — |
| Tack-Free Time (Mixed with WACKER Catalyst T 77, 12:1, at 23°C) | approx. 120 | minutes | — |
| Tack-Free Time (Mixed with WACKER Catalyst T 77 PLUS, 8:1, at 23°C) | approx. 35 | minutes | — |
| Tack-Free Time (Mixed with WACKER Catalyst T 77, 8:1, at 23°C) | approx. 60 | minutes | — |
| Viscosity (of the mixture (10: 1), Mixed with WACKER Catalyst T 77, at 25°C, Shear rate 0.5 s⁻¹) | approx. 25000 | mPa·s | DIN EN ISO 3219 |
| Viscosity (of the mixture (10: 1), Mixed with WACKER Catalyst T 77 PLUS, at 25°C, Shear rate 0.5 s⁻¹) | approx. 25000 | mPa·s | DIN EN ISO 3219 |
| Viscosity (of the mixture (10: 1), Mixed with WACKER Catalyst T 77, at 25°C, Shear rate 25 s⁻¹) | approx. 15000 | mPa·s | DIN EN ISO 3219 |
| Viscosity (of the mixture (10: 1), Mixed with WACKER Catalyst T 77 PLUS, at 25°C, Shear rate 25 s⁻¹) | approx. 15000 | mPa·s | DIN EN ISO 3219 |
| Value | Units | Test Method / Conditions | |
| Density (in water, at 23°C) | 1.23 | g/cm³ | DIN EN ISO 1183-1 A |
| Elongation (at break) | 130 | % | ISO 37 Type 1 |
| Shore Hardness A | 32 | — | DIN ISO 48-4 |
| Tear Strength | 3.8 | N/mm | ASTM D 624 B |
| Tensile Strength | 2 | N/mm² | ISO 37 Type 1 |
| Value | Units | Test Method / Conditions | |
| Density (at 23°C) | 1.28 | g/cm³ | DIN EN ISO 2811-2 |
| Dynamic Viscosity | 20000 | mPa·s | Brookfield |
Regulatory & Compliance
- Certifications & Compliance
- Chemical Inventories
- Quality Standards
Safety & Health
- Safety Note
While curing ELASTOSIL® RT 772 releases a total of approx. 1.5 - 2 wt.% alcohol. These vapors should not be inhaled for long periods or in high concentrations. Hence ventilation of the work place is recommended.
Packaging & Availability
- Country Availability
- Regional Availability
Storage & Handling
- Storage Information
Store in a dry and cool place.