Typical Curing Properties Mix ratio Technical Datasheet Ideal for bonding composite materials Easy to apply High shear and peel strength Rapid cure speed High temperature resistance Colour matched for FRP bonding PERMABOND® ET5428 is a thixotropic two-part adhesive with excellent resistance to impact and vibration. The controlled flow properties as well as its ease of mixing and application, enables the adhesive to be used where gap filling is required. Permabond® ET5428 has been found to provide exceptional performance even at elevated temperatures. Permabond® ET5428 has been specifically formulated for use in applications requiring toughness and high strength and shows special benefits in the construction of composite assemblies. Physical Properties of Uncured Adhesive Typical Performance of Cured Adhesive Shear strength* (ISO4587) *Strength results will vary depending on the level of surface preparation and gap. **SF Denotes substrate failure. The information given and the recommendations made herein are based on our research and are believed to be accurate but no guarantee of their accuracy is made. In every case we urge and recommend that purchasers before using any product in full-scale production make their own tests to determine to their own satisfaction whether the product is of acceptable quality and is suitable for their particular purpose under their own operating conditions. THE PRODUCTS DISCLOSED HEREIN ARE SOLD WITHOUT ANY WARRANTY AS TO MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR ANY OTHER WARRANTY, EXPRESS OR IMPLIED. No representative of ours has any authority to waive or change the foregoing provisions but, subject to such provisions, our engineers are available to assist purchasers in adapting our products to their needs and to the circumstances prevailing in their business. Nothing contained herein shall be construed to imply the non-existence of any relevant patents or to constitute a permission, inducement or recommendation to practice any invention covered by any patent, without authority from the owner of this patent. We also expect purchasers to use our products in accordance with the guiding principles of the Chemical Manufacturers Association’s Responsible Care® program. Permabond ET5428 Global TDS Revision 9 6th May 2026 Page 1/2 FOR PROFESSIONAL OR INDUSTRIAL USE ONLY. KEEP OUT OF REACH OF CHILDREN

Surface Preparation Surfaces should be clean, dry and grease-free before applying the adhesive. Use a suitable solvent (such as acetone or isopropanol) for the degreasing of surfaces. Some metals such as aluminium, copper and its alloys will benefit from light abrasion with emery cloth (or similar), to remove the oxide layer. % Strength Retention Temperature (°C) “Hot strength” shear strength tests performed on mild steel. Fully cured specimens conditioned to pull temperature for 30 minutes before testing at temperature. ET5428 can withstand higher temperatures for brief periods (such as for...