Technical Datasheet *Substrate failure was observed Typical fixture time (acrylic)* *The cure time depends on the power of the UV lamp, its spectral output, the distance between the lamp and the components, and the transmission characteristics of the substrates. Typical Curing PropertiesThermal Cycling The table below shows the shear strength retained after thermal cycling. Lap shear specimens were prepared and cured at 23°C, aged at the indicated temperature, and tested at 23°C. **LED UV lamps have a narrow range of spectral output. It is important to check suitability with Permabond in order to match the LED lamp's peak wavelength with that of the adhesive's photoinitiator to ensure optimal adhesive cure. *Substrate failure was observed. 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 UV643 Global TDS Revision 2 13th May 2026 Page 1/2 FOR PROFESSIONAL OR INDUSTRIAL USE ONL Y. KEEP OUT OF REACH OF CHILDREN

Other Products Available ■ Thread lockers ■ Thread sealants ■ Gasket makers ■ Sealants / retainers ■ For rapid bonding of metals, plastics, rubber and many other materials ■ Two-part room temperature cure adhesives ■ Single-part heat cure adhesives ■ Modified Technology (MT) flexible grades available ■ Single-part, moisture-curing, flexible sealants ■ Two-part room temperature curing adhesives Toughened Acrylics ■ Rapid curing, high strength structural adhesives UV Light Cured Adhesives ■ Glass / plastic bonding Additional Information This product is not recommended for use in contact with strong...