Apple Routes Flexible Heat Pipe Through iPhone Duo Hinge to Cool 2nm A20 Pro

Apple engineered a flexible graphite pipe routed directly through the iPhone Duo's hinge to transfer heat between the two halves of the device, effectively doubling the surface area for heat dissipation when folded. The A20 Pro chip in the iPhone 18 Pro line is built on a 2nm process and connects to its vapor chamber using a custom "metal over foam" material designed for direct thermal and mechanically compliant coupling. The specific A20 Pro variant inside the iPhone Duo features a second display engine to run the inner and outer screens simultaneously, alongside support for an under-display FaceTime camera on the inner screen. "It’s a flexible material that needs to survive, as you can imagine, many hinge cycles while maintaining its thermal connectivity, and also its structural integrity throughout the product life cycle." — Banafsheh Barabadi.