Issue link: https://iconnect007.uberflip.com/i/1361971
72 PCB007 MAGAZINE I APRIL 2021 Gay: Most definitely. Hunrath: It is also halogen-free and has a V0 UL fire retardant rating. It's got those boxes checked off as well. But based on the nature of the resin chemistry and its history in aerospace composites, it should outperform epoxy in ev- ery attribute. Gay: Yes. In this image (Figure 1), you can see the white lines are where the cracks are locat- ed. It's obviously drawn over the top of the cracks vs. actually showing the cracks because they're hard to see in the materials. Hunrath: Right. You'd see in the microscope the cracks would be a dark line or you'd see the fracture on the resin. Gay: Probably one of the standout features of the material is the fracture toughness. When you look at it from that perspective and the vi- bration that the product is going to see in dur- ing its life cycle, I think that's pretty important. But you know, maybe even under-the-hood applications on fuel powered cars as well. Hunrath: is just shows the thermal conduc- tivity. Resins are not only electrical insulators, they're also thermal insulators. But this res- in chemistry has a better ability to dissipate heat. Gay: Yes. It certainly increases the current car- rying capacity of the circuitry. And that means you're going to be able to increase how much power you've pushed through the system into the vehicle's battery. is kind of attribute is one of the things they were looking for during the development process. Johnson: Gentlemen, thank you for such a de- tailed discussion today. Gay: I appreciate the opportunity to talk with you. It's really great to do that. And having Chris on this call makes me feel a lot more comfortable because he's a very knowledge- able applications expert. Hunrath: anks. PCB007 Figure 1: Temperature cycling test (TCT) results are shown in this cross-section. Note the highlighted areas where cracks appear white in the FR-4 materials.