Applications

LOCTITE® EA M-121HP™ – Bonding dissimilar materials

Item Name: LOCTITE® EA M-121HP™
Manufacturer: Henkel
Technologies: Epoxy
Color: Resin – Off-white to beige, Hardener – Amber, Mixed – Amber-beige
Cure Type: Room temperature cure after mixing
Package Size: Contact to Avantek for details.
Shelf Life: Contact to Avantek for details.

1. Product Overview

LOCTITE® EA M-121HP™ is a two-component, medium-viscosity epoxy adhesive that cures at room temperature to form a tough, amber-beige bondline. It offers excellent resistance to peel, impact forces, and thermal shock. This adhesive is designed for bonding dissimilar materials such as metals, plastics, and ceramics and is suitable for medical device assembly.

2. Applications

  • High-impact and high-peel strength applications
  • Bonding dissimilar materials (e.g., aluminum, steel, plastics, ceramics)
  • Suitable for disposable medical device assembly
  • Offers excellent mechanical and electrical properties

3. Typical Properties

Uncured Properties

Property Resin Hardener
Appearance Off-white to beige liquid Amber liquid
Specific Gravity @ 25°C 1.1 1.0
Viscosity (mPa·s @ 25°C) 41,000 – 61,000 (Spindle 7, 50 rpm) 2,000 – 4,000 (Spindle 5, 50 rpm)
Mix Ratio (by weight) 100:46
Mix Ratio (by volume) 2:1

Mixed Properties

Property Value
Specific Gravity @ 25°C 1.07
Gel Time @ 100°C (seconds) 120 – 240
Working Life (minutes) 120
Tack-Free Time (minutes) 140

Cured Properties (@ 25°C, unless noted)

Property Value
Glass Transition Temperature (Tg) 90°C
Elongation (%) 10
Tensile Strength (N/mm²) 5,910
Shore Hardness (Durometer D) 76 – 90
Dielectric Breakdown Strength (kV/mm) 25.6

Adhesive Strength

Substrate Lap Shear Strength (N/mm²)
Steel (grit blasted) 29.4 (4,270 psi)
Aluminum (etched & abraded) 33.1 (4,800 psi)
Stainless Steel 23.1 (3,350 psi)
Polycarbonate 7.0 (1,010 psi)
Nylon 2.3 (330 psi)
PVC 11.7 (1,700 psi)
ABS 7.5 (1,090 psi)
Glass 22.7 (3,290 psi)

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