Applications

LOCTITE® 4902 FL

  • Item Name: LOCTITE® 4902 FL
  • Manufacturer: Henkel
  • Product Category: Instant Adhesives
  • Technologies: Cyanoacrylate (Ethyl and Octyl Cyanoacrylate)
  • Applications: Assembly of flexible medical devices, bonding plastics, rubbers, and metals
  • Color: Clear, colorless
  • Cure Type: Humidity cure
  • Package Size: Contact Avantek for details
  • Shelf Life: Contact Avantek for details

1. Product Overview

LOCTITE® 4902 FL is a highly flexible, fluorescent cyanoacrylate adhesive designed for assembling flexible medical devices. It provides strong bonding performance for dissimilar and opaque substrates while maintaining fast curing, ease of use, and high strength. The product is ISO 10993 tested for biocompatibility in medical device applications.

2. Applications

  • Assembly of flexible medical devices
  • Bonding plastics, rubbers, and metals
  • Used in applications requiring strength in flexing bond lines and leak resistance

3. Typical Properties

Before Mixing (Uncured)
Property Value
Chemical Type Ethyl and octyl cyanoacrylate
Appearance Clear, colorless liquid
Fluorescence Positive under UV light
Specific Gravity (@ 25°C) 1.03
Viscosity (@ 25°C, 100 s⁻¹) 150 to 250 mPa·s (cP)
Curing Properties
Condition Fixture Time (seconds)
Aluminum ≤20
ABS 5 to 10
Acrylic 30 to 45
Neoprene 120 to 210
Nitrile 20 to 45
Polycarbonate 5 to 10
PVC 15 to 45
Steel 10 to 30
After Mixing (Cured Properties)
Property Value
Shore Hardness (ISO 868) Shore A 65
Tensile Modulus 400 N/mm² (57,900 psi)
Glass Transition Temperature (Tg) 50°C
Coefficient of Thermal Expansion Below Tg: 110×10⁻⁶ K⁻¹ / Above Tg: 425×10⁻⁶ K⁻¹
Electrical Properties
Property Value
Surface Resistivity (IEC 60093) 145×10¹⁵ ohms
Volume Resistivity (IEC 60093) 11×10¹⁵ ohm-cm
Dielectric Breakdown Strength 32 kV/mm
Dielectric Constant (1 kHz) 3.34
Adhesive Strength
Substrate Lap Shear Strength (N/mm²)
Grit-Blasted Mild Steel 12
Aluminum (Etched) 14
ABS 8
PMMA 4.3
Polycarbonate 7.9
PVC 5.8
Environmental Resistance
Environment 100h 500h 1000h 5000h
Motor Oil (40°C) 85% 70% 65% 60%
Unleaded Gasoline (22°C) 65% 10% 25% 0%
Water (22°C) 70% 65% 60% 45%
98% RH, 40°C 55% 50% 65% 50%

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