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LOCTITE® SI 5031™ – UV/visible light curable silicone adhesive – Disposable medical device assembly

  • Item Name: LOCTITE® SI 5031™
  • Manufacturer: Henkel Corporation
  • Product category: Silicone adhesive for potting, coating, and sealing
  • Technologies: One-component, flowable acetoxy silicone that cures via UV/visible light with a secondary moisture cure
  • Applications: Provides uniform cavity fill for automotive, electronic, military, and industrial components
  • Color: Light yellow, translucent liquid
  • Cure type: Ultraviolet (UV) / Visible light cure with secondary moisture cure
  • Package size: Contact to Techniq VN for details
  • Shelf life: Contact to Techniq VN for details

1. Product Overview

LOCTITE® SI 5031™ is a one-component, flowable UV and visible light-curable silicone adhesive designed for potting, coating, and sealing applications. It offers:

  • Technology: Acetoxy silicone
  • Appearance: Light yellow, translucent liquid
  • Cure Type: UV/Visible light with secondary moisture cure
  • Viscosity: Self-leveling liquid
  • Key Benefits:
    • Self-leveling for uniform cavity fill
    • Forms a medium-strength, flexible sealant
    • Suitable for automotive, electronic, military, and industrial applications

2. Applications

  • Potting, coating, and sealing of electronic and industrial components
  • Ideal for applications requiring UV/visible light cure with moisture cure for shadowed areas

3. Typical Properties

Property Value
Uncured State
Specific Gravity @ 25°C 1.01
Viscosity (Brookfield, 25°C, Spindle 3, 10 rpm) 5,800 mPa·s (cP)
Fluorescence Positive under UV light
Curing Performance
Skin Over Time @ 23°C, 50% RH 20 min
Tack-Free Time (UV 70 mW/cm² @ 365 nm) 20 sec
Depth of Cure (UV 70 mW/cm² @ 365 nm, 90 sec) 20 mm
Cured Properties
Lap Shear Strength (Glass-Aluminum) 2 N/mm² (290 psi)
Lap Shear Strength (Glass-Steel) 1 N/mm² (150 psi)
Lap Shear Strength (Glass-Polycarbonate) 0.4 N/mm² (60 psi)
Environmental Resistance
Heat Aging @ 177°C, 168 hrs (Tensile Strength Change) -6%
Heat Aging @ 233°C, 168 hrs (Tensile Strength Change) +61%
Ethylene Glycol/Water @ 100°C, 168 hrs (Tensile Strength Change) -43%
ASTM IRM 903 Oil @ 150°C, 70 hrs (Volume Swell) +47%
5W30 Oil @ 150°C, 168 hrs (Tensile Strength Change) -55%

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BERGQUIST microTIM mTIM 1028 is purpose built for riding cage assemblies in servers, switches, and routers, interfacing with electroless nickel plated copper or aluminum heat sinks. It ensures stable operation in high power transceiver modules while also extending applicability to liquid cooling components, heat pipes, and fin based dissipative structures.

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