Applications

LOCTITE® EA M-31CL™ – Medical Grade Epoxy Adhesive – Bonding, potting, staking, laminating applications

  • Item Name: LOCTITE® EA M-31CL™

  • Manufacturer: Henkel

  • Technologies: Epoxy, Two-component (Resin & Hardener)

  • Color: Ultra clear (mixed), resin and hardener clear to slightly yellow

  • Cure Type: Room temperature cure after mixing

  • Package Size: Contact to Techniq VN for details.

  • Shelf Life: Contact to Techniq VN for details.

1. Product Overview

LOCTITE® EA M-31CL™ is a two-part, medical-grade epoxy adhesive that cures at room temperature to form an ultra-clear, high-strength bondline with minimal shrinkage. It combines excellent impact resistance, dimensional stability, and resistance to chemicals and solvents, while maintaining optical clarity. Tested to ISO-10993 protocols, it is suitable for medical device assembly. The cured epoxy demonstrates outstanding structural, mechanical, and electrical insulating properties, with reliability across a wide temperature range.


2. Applications

  • Bonding of glass, ceramics, metals, optical fibers, and rigid plastics

  • Potting, staking, and laminating applications requiring optical clarity

  • Assembly of disposable medical devices

  • Structural bonding where high transparency and resistance to chemicals are essential

3. Typical Properties

Property Still Not Mixed (Resin / Hardener) After Mixed / Cured
Appearance Resin: Clear to slightly yellow liquid
Hardener: Clear to slightly yellow liquid
Ultra-clear adhesive
Mix Ratio (by weight / by volume) 100:46 (weight), 2:1 (volume)
Specific Gravity @ 25 °C Resin: 1.1
Hardener: 1.0
Mixed: 1.07
Viscosity @ 25 °C Resin: 9,000–12,000 mPa·s
Hardener: 1,500–9,000 mPa·s
Working Life 30 min @ 25 °C
Tack-Free Time 160 min (low humidity)
Gel Time @ 100 °C 90–150 s
Cure Method Room temp cure (24 h) or accelerated cure (2 h @ 65 °C / heat to 93 °C to speed up)
Tensile Strength 55.2 N/mm² (8,000 psi)
Elongation at Break 8%
Glass Transition Temperature 70 °C
Shore Hardness D 80–90 (after 16–18 h @ 22 °C + 2 h @ 65 °C)

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