Samsung's Fold 8 hinge still isn't dustproof. The repair is the expensive half

iFixit's teardown of the Galaxy Z Fold 8 opens with a compliment and then wrecks it. "The Fold8 is the nicest foldable Samsung has made, right up until the hinge starts chewing grit." The passport-shaped $1,900 phone looks, in their telling, less like a folding demo and more like a normal expensive object. Then they put dust in it, because Samsung rates the thing IP48 and still warns owners to keep sand away from the hinge.

The 8 is the water. The 4 is the problem.

An IP48 rating means the Fold 8 can sit in 1.5 metres of fresh water for 30 minutes. It also means Samsung only certifies protection against solid objects a millimetre across or larger. Pocket lint, beach sand and the UV-reactive powder iFixit uses as a tracer all sit well below that line. Under the microscope, powder clumps measured around 0.04 mm. Even the smallest grains in a beach-sand sample came in a touch under 0.16 mm. Desert sand, iFixit notes, tends to be finer still.

Samsung's own caveats have barely moved in eight generations. In his Fold 8 durability test, Zach Nelson of JerryRigEverything read the same list he has been reciting since the original Fold: don't press the inner screen with a fingernail, don't close anything inside, don't peel the protector, keep it away from salt water. "The phone is not dust resistant." He opened this week's Fold 8 Ultra video the same way: "It's not dust resistant, only protected against fresh water."

iFixit's dust test is not an IP lab. The powder is finer than typical beach sand, chosen because it glows. After cycling the Fold 8 open and closed, Elizabeth Chamberlain's write-up says the hinge "started making truly awful crunching and grinding noises, and the phone stopped opening normally." On camera the line is blunter: "If your $2,000 phone sounds like it's chewing gravel, that's generally bad."

The teardown then split the phone into two stories. Batteries, cameras and boards were remarkably clean. The hinge was not. iFixit found the exposed mechanism packed with glowing powder, which made the crunching less mysterious. Samsung has previously sold the hinge and inner display as one replacement assembly. iFixit is scoring the Fold 8 on that assumption, which is why grit in the hinge is not a $50 clean-out.

Nelson runs a coarser, more theatrical version of the same idea. On the regular Fold 8 he dumped outdoor dirt around the hinge and came away relatively calm, saying it kept out the nitty-gritty about as well as last year's model. On the Fold 8 Ultra he piled on enough grit to stand in for a beach towel or a litter box. The hinge, he said, "does grind quite a bit when dust gets inside," but the inner screen stayed intact. The phone survived his test. The hinge still complained.

Those two results do not cancel each other. They describe two particle sizes hitting the same rating. iFixit's 0.04 mm powder wrecked the opening action. Nelson's chunkier mess made noise and left the display working. Neither tester is calling the Fold 8 dust-tight, because Samsung doesn't.

iFixit provisionally scored the Fold 8 4 out of 10. Some of that is earned: ordinary JIS and Phillips screws, a USB-C port on its own cable, and pull-tab jackets on two silicon-carbon cells totalling 18.68 watt-hours, an 8.8 percent bump over the Fold 7. Getting at one of those cells still means going through the outer display. The plastic bezel around the inner screen chipped apart during removal, and the flexible OLED did not survive the procedure.

Nelson priced the Ultra's inner-display replacement at $639 after he bent the taller phone until the panel flickered. iFixit's video puts a damaged hinge, sold with that inner screen, anywhere from a few hundred dollars to eight or nine hundred depending on the model. Official Fold 7 parts remain scarce a year on. At the time of filming, iFixit could not find a genuine Fold 8 cover display sold directly to US repairers.

Samsung did put metal under the crease. iFixit cut into the Flex Titanium stack and found a titanium-alloy film roughly a third the thickness of a human hair, plus a perforated support plate. Samsung says the film is 20 times stiffer than last year's polymer. Nelson, tearing down the Ultra, was less moved by the branding: the mesh under the crease looked to him like the supporting layer Samsung has used since the Fold 2 and Fold 3. Titanium in the display stack is not a dust seal.

The Verge's Jess Weatherbed, writing up the iFixit teardown, pointed at the comparison Samsung would rather skip. Google's Pixel 10 Pro Fold and Pixel 11 Pro Fold carry IP68. Honor's Magic V6, announced at MWC as the first foldable with both IP68 and IP69, is rated dust-tight and for high-pressure, high-temperature water jets. Android Central's Nicholas Sutrich later put a Magic V6 through mud and a dishwasher; the hinge sounded crunchy until the wash cycle, then the phone kept working. That is a stunt. It is also a rating Samsung still has not put on a $1,900 book-style Fold.

The Fold 8 is the nicest Samsung foldable iFixit has taken apart. The sealed guts stayed clean. The moving part that makes the phone a foldable did not. IP48 keeps freshwater out and leaves the hinge open to anything smaller than a millimetre, which is most of what lives in a pocket.