The definitive comparison of every screen-protector material type in 2026: tempered glass, PET film, TPU film, hydrogel, and UV liquid glass. Each scored against the others, recommended by use case, with the trade-offs we don't see other guides talking about. Independent. No paid placements.
For about 90% of buyers, the answer is simple: tempered glass. It gives you real impact protection, the touch feel closest to bare glass, and optical clarity that film can't match. The other 10% of buyers — owners of curved Samsung Galaxy screens, foldable phones, ultra-tight budgets, or specific edge cases like wet-environment use — should consider film. This guide explains why, and how to pick correctly in either category.
Skip ahead if you already know what you need: Tempered glass deep dive · PET and TPU film · Hydrogel · UV liquid glass · Side-by-side comparison · Which to buy, by use case
Tempered glass is what we recommend for the great majority of phones and tablets on the market. The construction is a thin layer of treated glass (typically 0.25-0.33mm), heat-treated and chemically strengthened so the surface resists scratches up to 9H on the Mohs hardness scale — the highest rating in the standard pencil hardness test, equivalent to mineral hardness around quartz. Keys, coins, sand, and the inside of your pocket don't scratch it.
What makes tempered glass good as a screen protector specifically: it's rigid, so it spreads impact force across its entire surface rather than concentrating it at the impact point. It feels like glass under your finger, because it is glass — touch response is the closest you can get to bare display. Optical clarity is excellent because the substrate is genuinely transparent rather than a polymer film with surface treatments. And when it does break, it breaks in a controlled way: the chemical strengthening makes it shatter into many small fragments rather than long sharp shards.
The downside, simply, is that tempered glass is brittle. Sharp impacts — corner drops on concrete, sliding into a metal countertop edge — will crack it. That's intentional. The protector is doing its job: it absorbed the force that would otherwise have shattered your $1,000 OLED. Replace and move on.
Glass can't follow curves. Edge-to-edge glass on the Samsung Galaxy S25 Ultra's slightly curved display will lift on the long edges within weeks. Glass on a foldable's inner display is structurally impossible. Glass on the Galaxy Z Flip's outer display is sometimes feasible, sometimes not depending on the model year. For these specific phones, film or UV liquid glass is the answer — covered below.
Film protectors come in two main polymer families: PET (polyethylene terephthalate) and TPU (thermoplastic polyurethane). PET is the older, harder, slightly cheaper film — it's the material that early-2000s screen protectors were made of, and you'll still find it. TPU is softer, more flexible, more forgiving of curves and folds, and is what most current "soft film" protectors are made of.
What films do well: they're flexible, so they conform to curved screens, edges that wrap, and the unusual geometry of foldables. They're thin (typically 0.15mm or less), so they affect touch sensitivity less than thick budget glass. They're cheap — multi-packs are common for under $10. And they're harder to "break" in the dramatic shattering way that glass breaks; a TPU film with a dent in it usually still functions.
What films don't do well: impact protection. A film over your phone screen when you drop the device face-first onto concrete will not save the screen. The film deforms; the screen behind it still cracks. PET is harder than TPU but neither material absorbs significant impact energy the way a 0.33mm sheet of tempered glass does. They protect against scratches — keys, coins, sand — not drops.
PET is harder, glossier, slightly more glass-like in feel, and slightly cheaper. Touch response is a bit better than TPU. It's the right film if you want a true budget protector and the device has a flat screen. Less forgiving of installation errors (creases stay creased).
TPU is softer, more flexible, more forgiving on curves, and is "self-healing" — minor surface scuffs disappear over hours as the polymer recovers its shape. Slightly tackier feel under finger, very slightly less optical clarity. Right film for curved Galaxy displays, the Galaxy Z Flip outer screen, and Galaxy Z Fold inner displays.
Hydrogel screen protectors are essentially a marketing-driven branding of softened TPU film. The "hydrogel" name implies a water-based or moisture-active material; in reality, it's a softer, more pliable TPU formulation. The properties that distinguish hydrogel marketing claims — self-healing, fits curved screens, ultra-thin — are properties of TPU generally, not unique to hydrogel.
That doesn't mean hydrogel is bad. It's a fine choice for the use cases TPU film generally fits: curved screens, foldables, devices where impact protection is a lower priority than coverage. The "self-healing" claim is real but narrow: minor surface scuffs and small scratches recover over hours; deep scratches, dents, and cracks do not. Treat it as a slightly nicer-feeling TPU.
Hydrogel is most common on Chinese e-commerce platforms (AliExpress, Temu) and on Amazon under various unfamiliar brand names. Prices are low — multi-packs under $5 are typical. Quality varies enormously. If you want hydrogel, stick with brands that have actual consumer reputation; we've seen "no-name" hydrogel protectors that develop yellow tinting in weeks.
UV liquid glass is the most interesting recent innovation in the category. The construction: instead of an adhesive layer pre-applied to the back of a glass protector, you apply a UV-curing liquid adhesive to the screen at install time. The liquid flows under the glass, filling every microscopic gap between protector and screen — critically, including the curved edges of Samsung Galaxy S25 Ultra and Z Fold displays where conventional flat glass can't reach. After application, you shine a UV lamp (included in the kit) on the device for about three minutes, and the liquid cures into a permanent optical-grade bond.
The result is genuine edge-to-edge coverage on curved displays — something no conventional tempered glass can match. Whitestone Dome Glass is the leading consumer brand here, available for the Galaxy S series flagships and most Galaxy Z models. The fit is so good that fingerprint sensors under curved displays continue working without the issues you get with budget eftermarket curved-screen glass.
The trade-off is installation difficulty. UV liquid glass is a one-shot deal. If dust gets trapped under the protector during the liquid-flow stage, you cure it in place and you start over with a new kit (around $35-45). The kit includes good dust-removal tools and clear instructions, but installation is genuinely harder than dropping a Spigen into an alignment frame. For Galaxy S Ultra or Z Fold owners, the extra care is worth it. For flat-screen iPhones, it's overkill.
| Material | Impact protection | Scratch resistance | Touch feel | Optical clarity | Curved screen fit | Typical price |
|---|---|---|---|---|---|---|
| Tempered glass (9H, 0.33mm) | ★★★★★ | ★★★★★ | ★★★★★ | ★★★★★ | ★★ (lifts on curves) | $10-30 |
| Aluminosilicate glass (ESR Armorite, premium) | ★★★★★+ | ★★★★★ | ★★★★★ | ★★★★★ | ★★ (lifts on curves) | $12-25 |
| PET film | ★ | ★★★ | ★★★★ | ★★★★ | ★★★ | $5-10 |
| TPU film | ★ | ★★★ (self-healing minor) | ★★★ | ★★★ | ★★★★★ | $5-12 |
| Hydrogel (softened TPU) | ★ | ★★★ (self-healing minor) | ★★★ | ★★★ | ★★★★★ | $3-10 |
| UV liquid glass (Whitestone Dome) | ★★★★★ | ★★★★★ | ★★★★★ | ★★★★★ | ★★★★★ | $35-50 |
Buy tempered glass. Specifically: our iPhone hub picks Belkin UltraGlass 2 for the Pro models and Spigen GlasTR EZ Fit two-pack for everything else. No film, no liquid, no debate.
Buy tempered glass. Samsung's own official glass for the Galaxy S series flagships, Spigen EZ Fit for the A-series. See our Samsung hub for model-specific picks.
Three valid options. Samsung's own official protector is the safest mainstream pick — it's calibrated for the curved geometry and the under-display fingerprint sensor. Whitestone Dome Glass (UV liquid) gives the best edge-to-edge coverage but is the hardest to install. A high-quality TPU film conforms to the curves and is the cheapest option but offers minimal impact protection.
TPU film for the inner foldable display. Glass is structurally impossible on the inner display because it has to bend. The inner display already has a factory-applied film; your job is replacing that film with a high-quality TPU as it wears, or covering its scratches. Samsung sells official inner-display film replacements via authorized service centers. The Z Flip outer cover screen and Pixel Fold outer screen take normal tempered glass.
Tempered glass for most use. If you draw or take handwritten notes with an Apple Pencil or S Pen, consider a Paperlike-style matte film for paper-like friction. See our iPad guide and Android tablets guide.
amFilm or JETech tempered glass multi-packs. Better impact protection than budget film, and the 3-pack price typically beats single-pack film anyway. Don't go below this floor — sub-$5 unbranded glass on Amazon is rarely worth even the low price.
Belkin UltraGlass 2 for iPhone, Whitestone Dome for Samsung curved flagships. Belkin's ion-strengthened glass measurably outperforms standard tempered glass on edge-impact scenarios. Whitestone's edge-to-edge UV bond is uniquely good for curved Galaxy displays.
For flat-screen phones and tablets — the vast majority of devices on the market — tempered glass is better. It provides real impact protection, the touch feel closest to bare glass, and visual clarity that film can't match. Film (PET or TPU) is the better choice only for curved screens, foldables, or strict budget situations. About 90% of buyers should choose tempered glass.
9H refers to the Mohs hardness scale rating of the glass surface — the highest rating in the standard pencil hardness test, equivalent to mineral hardness around quartz. It means the surface won't be scratched by ordinary objects like keys, coins, or sand. Note: 9H is the hardness rating of the surface, not the entire protector. The glass itself can still shatter from impact, which is precisely what you want it to do — better the protector than your screen.
Film protects against scratches — keys, coins, sand. It does not provide meaningful impact protection. If your phone hits the floor face-first with TPU film, your screen will probably crack anyway because film deforms rather than absorbing energy. Film is the right choice when you specifically need its flexibility (curved screens, foldables) or strict budget priority, not when you want impact protection.
UV liquid glass — Whitestone Dome Glass is the leading example — uses a UV-curing liquid adhesive that flows under the glass, fills every gap with a curved screen, and cures under a UV lamp included in the kit. The result is true edge-to-edge bonding that conventional tempered glass can't match on curved Samsung Galaxy displays. Worth it for Galaxy S Ultra and Z Fold owners. Overkill (and harder to install) for flat-screen phones.
Hydrogel is fine for what it is — a flexible self-healing TPU variant marketed primarily for curved phone screens. It's not bad, but it doesn't outperform regular TPU significantly. The 'self-healing' claim refers to minor surface scuffs disappearing over hours, not to scratches or impacts. If you need a film, plain TPU or hydrogel both work — pick by price and brand reputation.
For tempered glass, anything over 0.4mm starts to interfere with touch sensitivity and under-display fingerprint sensors. Premium tempered glass typically runs 0.25-0.33mm. For film, thickness isn't really a quality marker — most films are 0.15mm or less by default. The Galaxy S series under-display fingerprint sensor is particularly sensitive to thickness; budget thick glass on these phones can fail the sensor entirely.
Clear tempered glass has virtually no impact on screen brightness — light transmission of 90-95% is standard, indistinguishable in practice. Privacy protectors are the exception: they intentionally narrow the viewing angle, which reduces effective brightness by 25-30% to the user. Matte anti-glare films also reduce brightness slightly. Standard clear glass and standard clear film have no perceptible brightness effect.
Yes — and this is the unsung benefit. Apple Ceramic Shield and Samsung's Gorilla Glass Victus are tough but rate around 6H on the Mohs scale. A quality 9H tempered glass protector is harder than the screen underneath, meaning your protector takes scratches your bare screen would also have taken. When the protector becomes too scratched, you replace it for $15. Without it, you'd be replacing the entire screen for $329-409 at Apple.
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