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.
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.
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
| 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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