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LOCTITE® SI 5421 – Silicone adhesive – Bonding automotive sensors and gasketing EMI/RF shielded enclosures with flexibility

  • Item Name: LOCTITE® SI 5421
  • Manufacturer: Henkel Corporation
  • Product category: Silicone Adhesive for Bonding/Gasketing
  • Technologies: Alkoxy Silicone Technology
  • Applications:
    • Automotive sensor bonding
    • Gasketing of EMI/RF shielded enclosures
    • Enhances load-bearing and shock-absorbing properties of the bond area
  • Color: Tan Paste (uncured)
  • Cure type: Room Temperature Vulcanizing (RTV)
  • Package size: Contact to Techniq VN for details.
  • Shelf life: Contact to Techniq VN for details.

1. Product Overview

LOCTITE SI 5421 is a one-component, alkoxy silicone adhesive that cures at room temperature via moisture exposure. It forms a flexible, electrically conductive bond and is primarily used for automotive sensor bonding and gasketing of EMI/RF shielded enclosures.

2. Applications

  • Automotive sensor bonding
  • EMI/RF shielded enclosure gasketing
  • Bonding applications requiring flexibility and electrical conductivity

3. Typical Properties

Uncured Properties
Property Value
Specific Gravity (@ 20°C) 3.05 – 3.3
Appearance Tan Paste
Flash Point See SDS
Curing Properties
Property Condition Value
Tack-free Time 23±2°C / 50±5% RH 1 hour
Full Cure Time 72 hours
Cured Properties (72 hours @ 25°C / 50±5% RH)
Property Standard Value
Tensile Strength ISO 37 ≥0.7 N/mm² (≥102 psi)
Elongation ISO 37 ≥40%
Shore Hardness (A) ISO 868 50 – 65
Electrical Properties (24 hours @ 25°C / 50±5% RH)
Property Standard Value
Volume Resistivity IEC 60093 ≤0.01 Ω·cm
Adhesive Performance (7 days @ 25°C / 50±5% RH)
Property Standard Value
Lap Shear Strength (Alclad to Alclad) ISO 4587 ≥0.4 N/mm² (≥58 psi)
EMI/RF Shielding Effectiveness

LOCTITE SI 5421 provides shielding across a wide frequency range, offering significant attenuation at 30% compression level.

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