Home » News » Do You Know the Interlaminar Bond Strength of Thermoset Composites

Delamination is one of the major areas of failure for laminated composite materials and ‘Interlaminar stresses’ are the source of this failure. These ‘stresses’ can be caused by a number of factors including (but not limited to): internal voids / volatiles that are not properly removed during the laminating process, improper curing of resin, and the environmental conditions in its final application. Understanding the bond between laminations and amongst the resin molecules of thermosetting materials is essential in understanding how these composites are tested, and what applications are best for each.

Perhaps the largest factor(s) when looking at bond strength characteristics of composites are the base material and the resin system that it is laminated with. As you can see in the table of composites, the interlaminar bond strength differs among each grade by material/resin composition. This is important in determining the correct material for your application. For instance; G7 is a phenomenal thermal insulator with a temperature index of (220 °C), however, it will not be the best material for an application where it will be exposed to extreme tensile stresses pulling the material apart.

Bond Strength of Grade Composites

Bond Strength of Grade Composites
Grade Test Method Material/ Resin Sample thickness Result
G7 ASTM D229 Glass/ Silicone 0.500″ 650 lbs.
G10 ASTM D229 Glass/ Epoxy 0.500″ 2,500 lbs.
G11 ASTM D229 Glass/ Epoxy 0.500″ 2,200 lbs.

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