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LOCTITE® SI 5210™ – Alkoxy silicone RTV adhesive – Potting and sealing automotive electronics

  • Item Name: LOCTITE SI 5210™
  • Manufacturer: Henkel Corporation
  • Product category: RTV silicone potting adhesive
  • Technologies: One-component alkoxy silicone that cures via room temperature vulcanization with a fast surface cure and thixotropic properties
  • Applications: Ideal for potting, wire tacking, selective sealing, and vibration dampening on PCBs, especially in automotive electronics
  • Color: Translucent to opaque, slightly yellow to straw-colored paste
  • 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 5210™ is an ultra-fast curing, non-corrosive RTV silicone designed for potting, wire tacking, selective sealing, vibration dampening, and repair/rework applications on PCBs. It is ideal for high-volume manufacturing, particularly in automotive electronics and harsh environments. The product cures at room temperature with ambient humidity and has thixotropic properties that prevent migration after application.

2. Applications

  • Potting and encapsulation
  • Wire tacking
  • Selective sealing
  • Vibration dampening
  • PCB repair and rework
  • Automotive electronics and harsh environment applications

3. Typical Properties

Property Value
Uncured Properties
Specific Gravity (@ 25 °C) 1.05
Appearance Translucent to opaque, slightly yellow to straw color paste
Viscosity Thixotropic paste
Tack-Free Time (@ 22 °C / 50% RH) ≤5 min
Depth of Cure (4 hours) 2.0 mm
Depth of Cure (16 hours) 3.4 mm

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