I also took a few similar photos of the Z Fold8 to show that Samsung has fixed this error by making a shield for that door, minimizing the possibility of dust getting into the device.

Waterproof information of iPhone Duo and Galaxy Z Fold8:

iPhone Duo is IP68 rated, Samsung Galaxy Z Fold8 (and Z Fold8 Ultra) is IP48.

iPhone Duo

• IP68 (according to IEC 60529 standard).
• Dust (number 6): Dust-tight – completely dust-proof, no dust gets in under laboratory test conditions.
• Water (number 8): Immerse up to 6 meters for 30 minutes (same level as iPhone 18 Pro/Pro Max).

Apple clearly states: dust and water resistance

not permanent, may decrease over time due to normal wear and tear. Lab tests are usually performed in a static state (not folded/unfolded during testing).

In fact, tests (like JerryRigEverything) show that sand/dust can still get into the hinge when opened/closed many times, jamming the magnet and making it difficult to close the device.

Samsung Galaxy Z Fold8

• IP48.
• Dust (number 4): Only protects against solid objects larger than 1 mm. Does not protect against fine dust, sand, lint, lint... (Samsung and other companies also recommend avoiding dusty/sandy environments).
• Water (no. 8): Soak up to 1.5 meters for 30 minutes (fresh water, lab conditions).

Both the Z Fold8 and Z Fold8 Ultra use this level. The hinge is still a weak point for fine dust (iFixit and other tests have clearly demonstrated).

Close-up photos of two dusty areas of the two machines:

The small gap behind the bent screen is where dust will get in.

It can also enter from the direction when the screen is opened.

I took a closer photo so you can see this small slit. It's hard to see with your eyes, but there's a lot of sand and dust like this

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Samsung makes a small piece of plastic to cover this slot.

So when looking at this angle at this bend, it's not as beautiful as the iPhone Duo

But the problem is that we don't actually use it in this state.

When straightened out, the Samsung Z Fold8 screen will have a raised edge, which is the cover covering the dust door entering the device

While the iPhone is flat, there are still edges between the different components.

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The plastic of the Samsung Z Fold8 is thin and protruding, with carefully rounded corners and during normal use no one touches it.

Dust cover

No dust cover.