Toughening Chemistry Helps Meet or Exceed Stringent Industry Standards
Structural adhesive toughening chemistry is a key ingredient to achieving high joint strength, structure stiffness and durable adhesion. It also plays an integral role in terms of up taking oil and dry lube that is present on metals when entering the body shop.
When reviewed in relation to t-peel strength, Henkel’s high crash-resistant structural adhesives can achieve approximately 12 N/mm, compared to OEM requirements of 4-8 N/mm, across cold-rolled steel, electrogalvanized steel, hot-dipped galvanized steel and aluminum. This demonstrates excellent plastic deformation of the substrate in a crash situation.
In terms of impact wedge peel, testing is activated down to temperatures as cold as -40 degrees Celsius and as high as 80 degrees Celsius - reflecting extremes that can happen in different parts of the world. Typically, epoxies are quite brittle at very cold temperatures, making it very difficult to meet crash standards. Toughening chemistries once again take on a key role here, helping the adhesive remain ductile down to extremely cold conditions.
As a result, Henkel’s high crash-resistant structural adhesives can achieve far higher impact wedge peel results than industry standard of 15 N/mm; reaching greater than 30 N/mm on 0.8 mm cold rolled steel and approximately 40 N/mm on 2.0 mm aluminum.