How Samsung managed to waterproof the Galaxy Z Fold3 and Z Flip3, primarily using Armor Aluminum, tape, and goo, while adding S Pen support
Context & Ripple Effects
Samsung’s earlier Ultra Thin Glass design showed the core foldable trade-off: glass thin enough to bend still needed a plastic protective layer. The Fold3 and Flip3 engineering adds water resistance around that vulnerable form factor while extending the Fold3 with S Pen support.
The accompanying Fold3 launch positioned IPX8 water resistance and S Pen support as headline capabilities; subsequent Fold3 testing and Flip3 testing treated water resistance as a meaningful usability improvement, even as durability questions persisted.
First-order effects
- Samsung gives Galaxy Z Fold3 and Z Flip3 buyers water resistance through a combination of Armor Aluminum, tape, and sealing material, reducing a prominent practical concern around foldable-phone construction.
- Galaxy Z Fold3 gains S Pen support alongside its water-resistant design, making Samsung’s larger foldable more oriented toward multitasking and pen input.
Second-order effects
- Samsung’s foldable design team must carry the added sealing and reinforcement requirements into future hardware revisions, because reviewers still identified durability and device heft as unresolved constraints.
- The water-resistance baseline becomes more durable within Samsung’s own lineup: the later Galaxy Z Flip5 review also lists IPX8 protection, while continuing to flag uncertain long-term durability.
Third-order effects
- If Samsung can keep improving protection without sacrificing foldability, foldable phones shift from novelty hardware defined by fragility concerns toward a product category judged on the same everyday-use expectations as conventional phones.
- The remaining tension is architectural: mechanisms and flexible display layers require protection that can coexist with repeated bending, so materials and sealing engineering become a continuing differentiator for Galaxy Z devices.
The trend: Samsung’s Galaxy Z line is moving foldables toward mainstream-device durability expectations by treating flexible-display protection and water resistance as core product features.