Applications

LOCTITE® 4981™ – Cyanoacrylate Adhesive – Medical device assembly, disposable products, heat and humidity resistant applications

  • Item Name: LOCTITE® 4981™
  • Manufacturer: Henkel
  • Product Category: Instant Adhesives
  • Technologies: Cyanoacrylate (Ethyl cyanoacrylate)
  • Applications: Bonding rubbers, plastics, and metals; suitable for medical device assembly
  • Color: Transparent, colorless to pale yellow
  • Cure Type: Humidity cure
  • Package Size: Contact Techniq VN for details
  • Shelf Life: Contact Techniq VN for details

1. Product Overview

  • Technology: Cyanoacrylate adhesive
  • Type: Ethyl cyanoacrylate
  • Appearance: Transparent, colorless to pale yellow liquid
  • Viscosity: Medium
  • Curing Method: Humidity-cured
  • Key Features:
    • General-purpose adhesive with heat resistance
    • Resists thermal cycling and humidity
    • Suitable for disposable medical devices (ISO 10993 certified)

2. Applications

  • Bonding rubbers, plastics, and metals
  • Suitable for medical device assembly
  • Provides strong adhesion to various substrates

3. Typical Properties

Uncured Properties
Property Value
Specific Gravity @ 25°C 1.1
Viscosity (mPa·s) 400 – 600
Curing Performance
Substrate Fixture Time (Seconds)
Steel (degreased) 20 – 30
Aluminum 2 – 10
ABS 5 – 10
Phenolic 10 – 20
Cured Properties (After 24 hours @ 22°C)
Property Value
Coefficient of Thermal Expansion (K⁻¹) 80×10⁻⁶
Thermal Conductivity (W/m·K) 0.1
Glass Transition Temperature (°C) 120
Volume Resistivity (Ω·cm) 10×10¹⁵
Dielectric Breakdown Strength (kV/mm) 25
Adhesion Strength
Substrate Lap Shear Strength (N/mm²)
Steel (grit blasted) 19 (2,755 psi)
Polycarbonate 10 (1,450 psi)
Phenolic 10 (1,450 psi)
Environmental Resistance
  • Maintains strength after heat exposure and sterilization
  • Resists steam autoclave for up to 1 cycle
  • Withstands EtO and Gamma Radiation sterilization

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