Applications

LOCTITE ABLESTIK NCA 3218 – UV curable epoxy adhesive – Automotive ADAS optical module bonding

  • Item Name: LOCTITE ABLESTIK NCA 3218
  • Manufacturer: Henkel
  • Product Category: Adhesive and Sealant
  • Technologies: UV-curable epoxy, Dual cure (UV + heat)
  • Applications: Automotive ADAS Optical Modules, lens barrel-to-housing, lens housing-to-circuit board
  • Color: Gray
  • Cure Type: UV cure (5s @ 500 mW/cm²) + Heat cure (60 min @ 100°C)
  • Package Size: Contact Techniq VN for details.
  • Shelf Life: 6 months

1. Product Overview

LOCTITE® ABLESTIK NCA 3218 is a UV-curable epoxy adhesive designed for automotive ADAS Optical Modules. It provides fast UV cure, high Tg (glass transition temperature), low CTE (coefficient of thermal expansion), and low shrinkage. It is CMR and SVHC-free and can be applied by dispensing.

2. Applications

  • ADAS Optical Modules
  • Lens barrel-to-housing bonding
  • Lens housing-to-circuit board bonding

3. Typical Properties

Uncured Properties

Property Value
Viscosity @ 25°C (19.2 s⁻¹), mPa∙s 25,000
Shear thinning index (0.5/5 s⁻¹) 5
Density @ 25°C, g/cm³ 1.7
Shelf Life (@ -25 to -18°C) 6 months

Curing Performance

Curing Method Conditions
UV Cure 365 nm, 500 mW/cm², 5 sec
Heat Cure 60 min @ 100°C

Cure depth depends on UV intensity, exposure time, and substrate properties.

Cured Properties

Property Value
Glass Transition Temperature (Tg), °C 215
CTE Below Tg, ppm/°C 25
E-modulus @ 25°C (DMA), MPa 9,000
Cure Shrinkage (Volume %) 1.4
Cure Depth (UV only), mm 1.7

Adhesion Strength (Die Shear, FR4 to FR4)

Condition Strength (N/mm²) Strength (psi)
After UV Cure 4.9 711
After Full Cure 19.7 2,860

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