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3M™ Scotch-Weld® EPX® DP105 – Fast-setting, flexible clear epoxy for bonding dissimilar surfaces with thermal expansion differences

• Item Name: 3M™ Scotch-Weld® EPX® DP105
• Manufacturer: 3M
• Technologies: Two-component, fast-curing, flexible epoxy adhesive
• Color: Clear
• Cure Type: Ambient temperature, 4–5 minutes work life, full strength in 48 hours
• Package Size: Contact to Techniq VN for details
• Shelf Life: 12 months

1. Product Overview

3M™ Scotch-Weld™ EPX™ DP105 is a two-part, fast-setting, flexible, clear epoxy adhesive/sealant. It features a 4-minute work life, cures to a clear appearance even in large masses, and provides high peel strength with excellent flexibility, making it ideal for bonding dissimilar substrates with different thermal expansion rates. It uses a 1:1 mix ratio for convenient dispensing and application.


2. Applications

  • Bonding of dissimilar materials (metals, plastics, glass, wood, composites)

  • Applications where flexibility and thermal expansion mismatch resistance are required

  • Transparent bonding applications where clarity retention is essential

  • General industrial assembly, repair, and sealing

3. Typical Properties

Unmixed Properties

Property Base Accelerator Mixed
Specific Gravity 1.11 1.15
Viscosity @ 27 °C (cP) 2,000 11,000
Mix Ratio (by weight) 100 97
Mix Ratio (by volume) 100 100
Colour Clear Clear Clear
Work Life (23 °C) 2 g: 5 min / 20 g: 4 min ~4–5 minutes
Tack-Free Time 10 minutes
Handling Strength 20 min @ 23 °C
Full Cure 48 hrs @ 23 °C (1 week for full performance)
Shelf Life 12 months (15–25 °C storage)

Cured Properties

Property Value
Colour Clear
Hardness (Shore D, ASTM D2240) 39
Elongation 120 %
Tensile Strength 4.2 N/mm²

Adhesion Strength (Lap Shear at 23 °C)

Substrate Shear Strength (N/mm²)
Etched Aluminium 14.0
Sanded Aluminium (60 Grit) 10.5
Cold Rolled Steel 9.1
Wood (Pine) 2.1
Glass (Borosilicate) 1.4
Glass + 3M 3901 Primer 1.7
Polycarbonate 2.8
Acrylic 1.7
GRP 9.8
ABS 2.1
PVC 3.6
Polypropylene 0.5

Temperature Performance (Etched Aluminium, Shear/Peel)

Temperature (°C) Shear Strength (N/mm²) Peel Strength (DaN/cm)
–55 24.6 6.25
21 14.1 0.89
49 2.8 0.35
65 1.8 0.18
82 1.0 0.10

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