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LOCTITE SI 5031

  • 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 Avantek for details
  • Shelf life: Contact to Avantek 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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Gasket sealing is a core part of many industrial assembly and maintenance operations — from automotive engine housings to HVAC covers and machinery flanges. When selecting a gasketing solution, you need something that forms reliably in place, resists movement and fluids, and simplifies application — which is where Henkel Loctite SI 5910 fits perfectly

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