LOCTITE STYCAST 4640 is an RTV condensation-cure silicone rubber syntactic foam designed for airborne potting, sealing, and caulking applications requiring low weight and excellent dielectric properties. It is a two-component, lightweight, and temperature-resistant material with a room-temperature cure capability.
| Property | LOCTITE STYCAST 4640 | LOCTITE CAT 50 AMB |
|---|---|---|
| Brookfield Viscosity (mPa·s) | 45,000 | 85 |
| Density (g/cm³) | 0.75 | – |
| Shelf Life (@18-25°C, days) | 180 | – |
| Property | LOCTITE STYCAST 4640 + CAT 50 AMB | LOCTITE STYCAST 4640 + CAT 50-2 AMB |
|---|---|---|
| Brookfield Viscosity (mPa·s) | 45,000 | 45,000 |
| Density (g/cm³) | 0.75 | – |
| Work Life @ 25°C (minutes) | 60 | – |
| Cure Schedule | LOCTITE STYCAST 4640 + CAT 50 AMB |
|---|---|
| Room Temperature Cure | 16-24 hours @ 25°C |
| Heat Cure | 2-4 hours @ 65°C |
| Post Cure (if above 125°C expected) | 1-2 hours @ incremental 25-30°C steps |
| Property | LOCTITE STYCAST 4640 + CAT 50 AMB | LOCTITE STYCAST 4640 + CAT 50-2 AMB |
|---|---|---|
| Hardness (Shore A) | 70 | 64 |
| Elongation (%) | 135 | 51 |
| Water Absorption (24-hr boil, %) | <0.1 | – |
| Glass Transition Temperature (°C) | – | ≤50 |
| Coefficient of Thermal Expansion (µm/m·°C) | – | 193 |
| Property | LOCTITE STYCAST 4640 + CAT 50 AMB | LOCTITE STYCAST 4640 + CAT 50-2 AMB |
|---|---|---|
| Volume Resistivity (ohms·cm) | >1×10¹⁴ | – |
| Dielectric Strength (V/mil) | 250 | – |
| Dielectric Constant / Dissipation Factor | 2.0 / 0.004 (@1 MHz) | 3.2 / 0.266 (@50 Hz), 2.3 / 0.086 (@1 kHz), 2.1 / 0.005 (@1 MHz) |
| Property | LOCTITE STYCAST 4640 + CAT 50 AMB | LOCTITE STYCAST 4640 + CAT 50-2 AMB |
|---|---|---|
| Tensile Strength (N/mm² / psi) | 1.4 / 200 | 1.96 / 284 |
| Tear Strength (kgf/cm) | – | 1,030 |
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