3M™ Scotch-Weld™ Structural Epoxy Adhesive EC-9323 B/A is a two component epoxy paste adhesive which cures at room temperature or with mild heat to form a tough, impact resistant structural bond. It has an excellent adhesion to a wide variety of substrates such as metals, glass, ceramics and plastics, incl. GFRP and CFRP. Once cured it provides extremely high shear and peel strength over a wide temperature range, with outstanding resistance to harsh environments and chemicals commonly encountered in aerospace applications.
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Adhesive Type |
Epoxy
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Container Size (Imperial) |
0.26 gal, 1.06 qt, 5.28 qt, 21.13 gal |
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Container Size (Metric)
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1 L, 20 L
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Cure Rate
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7 Days
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Cure Temperature
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Room Temperature
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Too See 3M™ Scotch-Weld™ Paste Adhesive EC-9323 B/A technical data sheet (TDS) and the 3M™ Scotch-Weld™ Paste Adhesive EC-9323 B/A safety data sheet (SDS). Visit here
The standard mix ratio for EC-9323 B/A is 100:27 by weight (or 100:30 by volume). Once mixed, it offers a generous work life of approximately 150 minutes (for a 50g mass at 23°C), allowing for precision alignment of large or complex aerospace assemblies before the adhesive begins to set.
While it reaches handling strength in 4–5 hours, a full cure at room temperature (23°C) takes 14 days. However, the process can be significantly accelerated with mild heat: a full cure is achieved in just 2 hours at 65°C or 15 minutes at 100°C.
Yes, once cured, EC-9323 B/A provides exceptional resistance to harsh environments and chemicals commonly encountered in aviation, including Skydrol 500B hydraulic fluid, JP-4 jet fuel, engine oils, and salt spray, maintaining its bond integrity even under long-term exposure.
The "toughened" nature of EC-9323 B/A means it contains specialized agents that absorb energy and resist crack propagation. This results in superior peel strength and the ability to withstand high-vibration and high-impact flight conditions that might cause standard, brittle epoxies to fail.
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