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LOCTITE® SI 5399™ – Acetoxy silicone adhesive sealant – High temperature industrial gasketing and sealing

  • Item Name: LOCTITE® SI 5399™
  • Manufacturer: Henkel
  • Product Category: Bonding/Sealing Sealant
  • Technologies: Silicone (Acetoxy silicone)
  • Applications: Used for sealing, bonding, and high-temperature protection in industrial and heating equipment applications up to 350 °C.
  • Color: Red paste
  • Cure Type: Room temperature vulcanizing (RTV)
  • Package Size: Contact Techniq VN for details.
  • Shelf Life: Contact Techniq VN for details.

1. Product Overview

LOCTITE® SI 5399™ is a one-component acetoxy silicone sealant that cures at room temperature via exposure to atmospheric moisture. It is primarily used for sealing, bonding, and high-temperature protection in industrial applications. This product is suitable for use in environments up to 350°C.

2. Applications

  • Industrial bonding/sealing applications
  • Heating engineering and industrial ovens
  • Household electrical and industrial heating equipment

3. Typical Properties

Uncured Properties

Property Value
Specific Gravity @ 20°C 1.04
Extrusion Rate (3mm Nozzle, 0.6MPa, 25°C) 250 g/min
Thixotropic Yes (Reduced migration after application)
Surface Cure (Tack-Free Time) 5 min @ 23°C, 50% RH

Cured Properties (After 1 Week @ 25°C)

Property Value
Shore Hardness (A) 33
Elongation at Break (%) 500
Tensile Strength (N/mm²) 3.3 (475 psi)
Tensile Modulus (N/mm²) 0.8 (120 psi)

Electrical Properties

Property Value
Volume Resistivity (Ω·cm) 7.3×10¹⁵
Dielectric Strength (kV/mm) 23.3
Dielectric Constant (1MHz) 2.4

Adhesion Performance (After 14 Days @ 25°C, 1mm Bondline)

Substrate Lap Shear Strength (N/mm²) psi
AG3 Aluminum 2.5 360
AG3 Aluminum (1mm Gasket) 1.7 250
Alclad Aluminum (1mm Gasket) 1.6 230

Environmental Resistance (Aged @ 150°C for 70h in Engine Oil)

Property Value
Volume Swell (%) 21
Shore Hardness (A) 14
Tensile Modulus (N/mm²) 0.4 (60 psi)
Tensile Strength (N/mm²) 1.65 (240 psi)
Elongation at Break (%) 590

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