Applications

LOCTITE® SI 5055™ – Silicone adhesive sealant – Electronics and medical device assembly

  • Item Name: LOCTITE® SI 5055™
  • Manufacturer: Henkel
  • Product Category: Silicone Adhesive
  • Technologies: Alkoxy silicone, UV/Visible light curable
  • Applications: Ideal for bonding, potting, coating, and sealing in disposable medical device assembly.
  • Color: Light yellow, transparent liquid
  • Cure Type: Ultraviolet (UV) / Visible light cure
  • Package Size: Contact Techniq VN for details.
  • Shelf Life: Contact Techniq VN for details.

1. Product Overview

  • Technology: Silicone
  • Chemical Type: Alkoxy silicone
  • Appearance (Uncured): Light yellow, transparent liquid
  • Components: One-component (no mixing required)
  • Cure Method: Ultraviolet (UV) / Visible light
  • Application: Bonding, Potting, Coating, Sealing
  • Special Feature: Designed for disposable medical device assembly, cures to form a tough transparent silicone rubber
  • Biocompatibility: Tested per Henkel protocols based on ISO 10993

2. Applications

  • Medical device assembly
  • Bonding of various materials, including glass, metals, and plastics
  • Potting and encapsulation of electronic components
  • Coating and sealing applications requiring UV/visible light curing

3. Typical Properties

Uncured Material

Property Value
Specific Gravity 0.98
Viscosity (Brookfield RVT, 25°C, Spindle 2, 20 rpm) 200 to 850 mPa·s (cP)
Flash Point See SDS

Curing Performance

Property Value
Tack-Free Time (Zeta® 7200, 70 mW/cm² @ 365 nm) ≤30 seconds
Depth of Cure (60 sec, 70 mW/cm² @ 365 nm, Zeta® 7200) ≥4 mm

Cured Material

(Cured @ 70 mW/cm² @ 365 nm for 60 sec, followed by 24 hrs @ 22°C, 50±5% RH)

Property Value
Shore Hardness (ISO 868, Durometer A) 45 to 65
Elongation at Break (ISO 527-3) >80%
Tensile Strength (ISO 527-3) >6.0 N/mm² (870 psi)
Compression Set (ASTM D 395, Method B, 24 hrs @ 22°C) 7.9%
Dielectric Breakdown Strength (IEC 60243-1) 15.3 kV/mm
Volume Resistivity (IEC 60093) 1.10×10¹⁵ Ω·cm

Adhesive Properties

(Cured @ 70 mW/cm² @ 365 nm for 60 sec per side, plus 24 hrs @ 22°C, 50±5% RH)

Substrate Combination Lap Shear Strength (N/mm²)
Aluminum to Glass 2.4 (355 psi)
Steel to Glass 2.7 (400 psi)
Polycarbonate to Polycarbonate 4 (590 psi)
Polycarbonate to Aluminum 4.5 (650 psi)
Polycarbonate to Steel 2.6 (380 psi)
Polycarbonate to ABS 3.7 (540 psi)
Glass to PVC 2.3 (330 psi)
Glass to Nylon 1.3 (190 psi)

Environmental Resistance

Test Condition Change in Durometer (Points) Change in Tensile Strength (%) Change in Elongation (%)
Aged @ 177°C for 168 hrs -22 -64 -24
Aged @ 100°C for 168 hrs (Glycol/Water 50:50) -10 -14 -9
Aged @ 150°C for 168 hrs (5W30 oil) -38 -92 +21
Aged @ 150°C for 168 hrs (ATF) -57 -97 +16

Sterilization Resistance

  • 100% strength retention after sterilization by Gamma, ETO, and Autoclave (30kGy, 1 Cycle)

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