Enhanced TDS
Knowde-enriched technical product data sheet
Identification & Functionality
- Chemical Family
- Product Type
- Technologies
- Product Families
Features & Benefits
- Ready-to-Use Product Features
- Special Features
- Electrically insulating
- Heat resistant
- Low viscosity
- One-component
- Self-adhesive
- Steam resistant
- Thixotropic
- UV & weathering-resistant
Applications & Uses
- Markets
- Applications
- Application Area
- Cure Method
- Applications
Small Appliances
- Application Details
- Multipurpose potting and coating grade
- Surface adhesive
- Typical fields of application: household appliances, automotive, e-mobility and mechanical engineering.
Processing
- All surfaces must be clean and free of contaminants that will inhibit the cure of ELASTOSIL® RT 708. 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. To eliminate any air introduced during dispensing or trapped under components or devices a vacuum encapsulation is recommended. Alternatively, ELASTOSIL® RT 708 can be de-aerated prior to use; applying a vacuum of 25-50 mbar for 10-15 min is recommended.
Curing:
- ELASTOSIL® RT 708 is a one-part heat-curing silicone, the curing time of which is highly dependent on temperature and on both the size and the heat sink properties of the components being potted.
- ELASTOSIL® RT 708 is usually cured between 140 °C and 200 °C in order to secure a quick build-up of adhesion to the respective substrate. Recommended curing temperatures and resulting curing times are given in adjacent table.
Temperature Curing rate, 1cm
140 °C 10 min 200 °C 2 min 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 rubber needs to be rubbed off or removed mechanically, if necessary in combination with a swelling agent (solvent) or a chemical silicone remover.
Properties
- Typical Properties
Value Units Test Method / Conditions Recommended Service Temperature -50 to +230 °C - - Cured Properties
Value Units Test Method / Conditions Density (in water, at 23°C) 1.35 g/cm³ DIN EN ISO 1183-1 A Elongation (at break) 250 % ISO 37 Type 1 Shore Hardness A 42 - DIN ISO 48-4 Tear Strength 6.3 N/mm ASTM D 624 B Tensile Strength 4 N/mm² ISO 37 Type 1 - Uncured Properties
Value Units Test Method / Conditions Density (at 23°C) 1.36 g/cm³ DIN 53217 Dynamic Viscosity (at 25°C, Shear rate 0.5 s⁻¹) 75000 mPa·s DIN EN ISO 3219 Dynamic Viscosity (at 25°C, Shear rate 25 s⁻¹) 35000 mPa·s DIN EN ISO 3219 Pot Life (at 23°C) approx. 6 months - T90 (at 140°C) 2 minutes ISO 6502 - Properties
- High extrusion rate
- Self-leveling
- Suitable for silk-screen printing
- Fast curing at elevated temperature
- Equipped with an UV-active fluorescent tracer for optimized process control.
- Recommended service temperature range: -50 °C to +230 °C.
- Note
Curing conditions: 10 min. at 165 °C in a circulating air oven, 2 mm sheet, pressed, no post-curing for cured properties.
Regulatory & Compliance
- Certifications & Compliance
- Chemical Inventories
Safety & Health
- Safety Note
According to the latest findings, the addition-curing silicone rubber ELASTOSIL® RT 708 contains neither toxic or corrosive substances which would require special handling precautions.
Packaging & Availability
- Country Availability
- Regional Availability