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LOCTITE® SI 5421 – Alkoxy silicone RTV adhesive – Automotive sensor bonding, EMI/RF shielded enclosure gasketing

  • Item Name: LOCTITE SI 5421
  • Manufacturer: Henkel Corporation
  • Product category: Bonding/Gasketing Adhesive
  • Technologies: One-component alkoxy silicone (RTV)
  • Applications: Used for automotive sensor bonding and gasketing of EMI/RF shielded enclosures.
  • 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 (RTV) to form a flexible, electrically conductive bond. It is primarily used for automotive sensor bonding and gasketing of EMI/RF shielded enclosures.

2. Applications

  • Automotive sensor bonding
  • Gasketing for EMI/RF shielded enclosures
  • Forms a flexible, shock-absorbing bond

3. Typical Properties

Uncured Properties
Property Value
Specific Gravity @ 20°C 3.05 – 3.3
Flash Point Refer to SDS
Curing Performance
  • Surface Cure: Tack-free within 1 hour at 23±2°C / 50±5% RH
  • Full Cure: 72 hours at 25°C / 50±5% RH
Cured Properties
Property Value Standard
Tensile Strength ≥0.7 N/mm² (≥102 psi) ISO 37
Elongation ≥40% ISO 37
Shore Hardness (A) 50 – 65 ISO 868
Electrical Properties (After 24 hrs cure at 25°C / 50±5% RH)
Property Value Standard
Volume Resistivity ≤0.01 Ω·cm IEC 60093
Adhesive Properties (After 7 days cure at 25°C / 50±5% RH)
Property Value Standard
Lap Shear Strength (Alclad to Alclad) ≥0.4 N/mm² (≥58 psi) ISO 4587
EMI/RF Shielding Effectiveness (30% Compression Level)
  • Provides attenuation across a wide frequency range (10 MHz – 10 GHz).

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