Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Product Type
- Technologies
Features & Benefits
- Materials Features
- Ready-to-Use Product Features
- Special Features
- Condensation-curing
- Electrically insulating
- Non-slump
- Oil resistant
- Self-adhesive
- Shear thinning
- Thixotropic
- Two-component
- UV & weathering-resistant
Applications & Uses
- Applications
- Cure Method
- Application Details
- Special FIPG grade for the adhesive sealing of automotive assemblies with oil contact, e.g. engine housings, oil pans, gear boxes.
- Typical fields of application: automotive, mechanical engineering.
Processing
Surface Preparation:
ELASTOSIL® RT 779 shows primerless adhesion to many substrates and usually tolerates a multitude of surface contaminants. However, for an optimum bonding all surfaces must be clean and dry. Standardized industrial cleaning processes can be applied to remove dirt, rust, oil or grease. Additionally, and in complicated cases involving demanding substrates, the surfaces can either be roughened by sandblasting or activated by plasma, corona or laser treatments prior use.
Mixing and Curing:
- ELASTOSIL® RT 779 is processed in combination with WACKER® Catalyst T 79 as curing agent. Prior to application the two compounds must 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 779) to curing agent (WACKER® Catalyst T 79). 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 high temperature without damage. Cured ELASTOSIL® RT 779 usually shows good primerless adhesion to many substrates, even when continuously exposed to motor oil and lubricants.
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).
- Applications
- Formed-In-Place-Gaskets (Wet Type)
- Machine Building
Properties
- Physical Form
- Typical Properties
- Catalyst Properties
- Cured Properties
- Uncured Properties
- Properties
Uncured:
- Non-slump paste
- Fast curing at room temperature
- To be cured with WACKER® Catalyst T 79 (recommended mixing ratio: 10:1),
- Low risk of curing inhibition
Cured:
- Medium hardness
- Primerless adhesion to many substrates (glass, ceramics, metals, plastics and powder coatings), in particular to stainless steel, aluminum, cast iron and polyamide.
- Recommended service temperature range: -50 °C to +180 °C.
- Designed for FIPG applications
- Outstanding oil resistance
The performance of ELASTOSIL® RT 779 in regard to adhesive sealing of oil pans was proven by inpro.
- Note
- Cured properties are cured with WACKER Catalyst T 79, mixing ratio 10:1 (by weight).
- Curing Conditions: 14 days at 23 °C and 50 % rel. humidity, 2 mm sheet, no post-curing.
- Catalyzed properties are mixed with WACKER Catalyst T 79 (mixing ratio in parts by weight.
| Value | Units | Test Method / Conditions | |
| Recommended Service Temperature | -50 to +180 | °C | — |
| Value | Units | Test Method / Conditions | |
| Pot Life (10:1, at 23°C) | 7 - 10 | minutes | DIN EN ISO 3219 |
| Pot Life (12:1, at 23°C) | 10 - 15 | minutes | DIN EN ISO 3219 |
| Pot Life (8:1, at 23°C) | 5 - 8 | minutes | DIN EN ISO 3219 |
| Tack-Free Time (10:1, at 23°C) | approx. 45 | minutes | — |
| Tack-Free Time (12:1, at 23°C) | approx. 60 | minutes | — |
| Tack-Free Time (8:1, at 23°C) | approx. 30 | minutes | — |
| Viscosity (of the mixture (10: 1), at 25°C, Shear rate 0.5 s⁻¹) | approx. 500000 | mPa·s | DIN EN ISO 3219 |
| Viscosity (of the mixture (10: 1), at 25°C, Shear rate 25 s⁻¹) | approx. 75000 | mPa·s | DIN EN ISO 3219 |
| Value | Units | Test Method / Conditions | |
| Density (in water, at 23°C) | 1.32 | g/cm³ | DIN EN ISO 1183-1 A |
| Elongation (at break) | 250 | % | ISO 37 Type 1 |
| Shore Hardness A | 50 | — | ISO 1183-1 A |
| Tear Strength | 9.5 | N/mm | ASTM D 624 B |
| Tensile Strength | 2.8 | N/mm² | ISO 37 Type 1 |
| Value | Units | Test Method / Conditions | |
| Density (at 25°C) | 1.38 | g/cm³ | DIN 53217 |
| Dynamic Viscosity (at 25°C, Shear rate 0.5 s⁻¹) | 300000 | mPa·s | DIN EN ISO 3219 |
| Dynamic Viscosity (at 25°C, Shear rate 25 s⁻¹) | 150000 | mPa·s | DIN EN ISO 3219 |
Regulatory & Compliance
- Certifications & Compliance
Safety & Health
- Safety Note
While curing ELASTOSIL® RT 779 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.