Henkel Loctiter SI 5699 Grey RTV Silicone Flange Sealant for Transmission & Rigid Housing Gasket
Henkel Loctiter SI 5699™ is a one-component, oxime-type, grey thixotropic paste silicone sealant that cures at room temperature via moisture absorption (RTV), designed specifically for flange gasketing.
| Property | Value / Description |
|---|---|
| Technology | Silicone, Oxime type |
| Appearance (Uncured) | Grey Paste |
| Components | One component – no mixing required |
| Cure Mechanism | Room Temperature Vulcanizing (RTV) – moisture cure |
| Thixotropic | Yes – reduced migration after application |
| Specific Gravity @ 20°C | 1.45 |
| Extrusion Rate | ≥200 g/min @ 0.62 MPa, 15 s, 25°C |
| Tack Free Time @ 25°C / 50±5% RH | ≤30 min |
| Shore Hardness, ISO 868 (Durometer A) | 45 to 75 |
| Elongation, ISO 37 | ≥100 % |
| Tensile Strength, ISO 37 | ≥2.4 N/mm² (≥348 psi) |
| Lap Shear Strength – Grit Blasted Mild Steel | 1.3 to 2.1 N/mm² (189 to 305 psi) |
| Lap Shear Strength – Abraded Aluminum | 1.3 to 2.0 N/mm² (189 to 290 psi) |
| Surface / Volume Resistivity, IEC 60093 | 2*10¹⁵ Ω / 2*10¹⁵ Ω·cm |
| Dielectric Constant @ 100 Hz / 10 kHz / 10 MHz | 2.8 / 4.0 / 4.1 |
| Oil Resistance (Multigrade @ 120°C, 1000 h) | 90 % of initial strength retained |
| NSF Registration | Category P1 (non-food-contact areas) |
| Service Temperature Range* | -55 °C to +200 °C (-65 °F to +400 °F) |
| Recommended Storage | 8 °C to 21 °C, unopened, dry location |
Loctiter SI 5699™ cures to a tough, flexible rubber-like gasket (FIPG) with excellent resistance to engine oil, gear oil, ATF and water/glycol. It is non-corrosive, low-odor, tack-free in ≤30 min, and suitable for metal and some plastic flanges.
The product is thixotropic—it holds its shape on vertical surfaces without slump. The neutral oxime cure system is non-corrosive to Al, cast iron and steel, making it suitable near corrosion-sensitive electronic assemblies. NSF Category P1 registered (non-food-contact areas). Cured hardness: Shore A 45–75, elongation ≥100%, accommodating flange gaps and thermal cycling.
Commonly used as a formed-in-place gasket (FIPG) on oil- and water/glycol-resistant rigid or flexible flanges in automotive & industrial equipment:
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