Xiaomi in a metal case: what models are relevant and whether to buy them

In the world of mobile technology, body materials play a crucial role not only in aesthetics but also in the durability of the device. For a long time, Chinese giant Xiaomi has experimented with various composites, but it is models with an all-metal rear panel or aluminum frame that remain the benchmark of reliability. Users often look for Xiaomi in a metal case, wanting to get a device that not only looks expensive, but also effectively removes heat from a powerful processor.

There are many options on the market today, from budget solutions to the flagship Mi and Xiaomi series. It is important to understand that “metal” does not always mean “whole metal.” Modern technology allows you to combine a durable aluminum alloy of the 6000 or 7000 series with tempered glass or ceramics, creating hybrid designs.

In this article, we will discuss in detail which models received a monolithic body, how to distinguish a quality alloy from cheap plastic with spraying and what to look for when buying a used device. You will learn about the benefits of heat sink in aluminum sandwiches and understand why some flagships returned to metal after experimenting with glass.

Advantages and disadvantages of aluminum cases in smartphones

The use of aluminum in smartphone manufacturing is not just a tribute to fashion, but a technological necessity for certain classes of devices.The metal case provides excellent thermal conductivity, which is critical for gaming models and fast-charging devices. The heat from the processor is evenly distributed throughout the area of the back cover, preventing local overheating and trottling (decreased performance).

But metal has its own nuances to be aware of before buying, such as the metal back panel can affect wireless antennas if engineers don’t have special antenna inserts, and the metal cools faster in the cold, which can lead to faster discharge of lithium-polymer batteries in the winter.

In terms of aesthetics and tactile sensations, metal often beats plastic, but loses to ceramics in strength when struck. Aluminum tends to dent when dropped heavily, whereas glass can simply break. However, anodized aluminum is highly resistant to scratches and abrasion, retaining its presentation for years.

⚠️ Warning: Metal body can interfere with work NFC-antennas or wireless charging if the design is not properly designed. Always check for these modules in the specification of a particular model.

Also worth mentioning is the weight of the device: Metal-framed smartphones tend to be heavier than their plastic counterparts, but lighter than ceramic ones, which creates a “thing” feel in the hand, but for some users, the extra weight can be a drawback when used with one hand for long periods.

Xiaomi and Mi flagship series with metal elements

The company's flagship lineup has historically gravitated toward premium materials. Starting with the legendary Xiaomi Mi 4, which was made entirely of stainless steel, the company set the bar high. Later, in the era of the Mi 5 and Mi 6, it used a complex design: a metal frame and a glass or ceramic back panel. However, the all-metal flagships did not go anywhere.

Xiaomi 12S series models and some Xiaomi 13 versions use a high-strength aluminum alloy for the frame, which ensures stiffness of the design. At the same time, the Xiaomi Civi series, which is focused on style, often combines metal and glass, creating light and thin devices. A key element here is anodizing, which gives the metal a rich color and protection from oxidation.

If you’re looking for a classic metal body among recent flagships, it’s worth looking at special versions or models from previous years that are still relevant in performance.The company’s engineers are constantly improving the alloys by adding magnesium and titanium to increase strength without increasing weight.

Importantly, in the flagship segment, metal is often used in combination with other materials to create a unique design, such as textured metal or matte soft touch coating on an aluminum basis create a sense of premium that is difficult to reproduce with plastic.

Budget segment: Redmi Note and metal cases

In the low-end and mid-range, Redmi (a sub-brand of Xiaomi) has long been the king of metal cases. The Redmi Note series (especially the Note 3, Note 4, Note 5, Note 8 Pro) were famous for their all-metal "unisans" that allowed them to offer devices that looked more expensive than their price.

With the release of the Redmi Note 9 and newer versions, the trend has shifted towards plastic with a texture under glass or metal. However, many users still look for metal models, because they are perceived as more reliable. In the Redmi Note line, metal is often combined with plastic inserts for antennas, which can be visually almost invisible.

• 📱 Redmi Note 8 Pro is one of the last mass models with a full-fledged metal frame and glass back, but feels like a monolith.
• 🔩 Redmi Note 5 / 6 Pro – classic “metalists” with a single back cover made of aluminum alloy.
• ⚙️ Redmi Note 4X — legendary model, which became a symbol of the reliability of the metal case in the budget class.

When choosing a budget smartphone with a metal case, it is important to consider that sprayed plastic (NCVM) can externally mimic metal, but will differ by touch and thermal conductivity.

Poco gaming smartphones and metal strength

The performance-focused Poco brand also pays attention to the materials of the case. Gaming smartphones require efficient cooling, and metal is an ally here. The Poco X and Poco F series models often feature a metal frame that serves as a radiator to remove heat from the processor.

For example, the Poco X3 NFC and its successors have a plastic case, but with a reinforced design, while the Poco F3 and F4 have returned to using aluminum bezels and glass. However, if you look at purely gaming solutions, the metal frame inside is the de facto standard for protecting the motherboard from bends.

For gamers, the metal body is not just about aesthetics: In long sessions in demanding games (Genshin Impact, PUBG Mobile), the smartphone body heats up. Metal helps dissipate this energy, although it makes the device hot to the touch. It's a normal working situation for passive cooling.

It is worth noting that in game models, special graphite gaskets and copper tubes are often used, which contact the metal frame or internal metal plates, enhancing the effect of heat sink.

⚠️ Note: When using a smartphone in a metal case for games without additional cooling (cooler), the surface of the device can be heated to 45-50 Celsius, which is comfortable for heat removal, but unpleasant for the hands.

How to distinguish high-quality metal from plastic with spray

In today's technology market, manufacturers have learned to mimic metals. NCVM (Non-Conductive Vacuum Metallization) technology allows the thinnest layer of metal to be applied to plastics. Visually, it can be difficult to distinguish these materials, but there are several proven methods.

The first and easiest way is a temperature test, because metal is highly thermally conductive, and if you pick up a smartphone after you're in a cool room, the real metal will look cold and heat up quickly from the heat of your palm, and the plastic will stay warm or at room temperature and heat more slowly.

The second thing is the sound when you tap, you tap your nail carefully on the back, the metal makes a loud, high sound, whereas the plastic sounds blank, and you can also look at the antenna inserts, which are mandatory in all-metal cases and look like stripes, while in plastic simulations they may not be at all, or they are made decoratively.

Another method is to use a magnet (if the smartphone doesn't have speaker magnets next to the lid) and aluminum doesn't magnetize, but ferromagnetic steel (used in some older Xiaomi models) will react. Plastic is naturally inert to magnets, but this method is less reliable because of the internal components.

Comparative table of popular models with metal

For ease of choice, we have prepared a table comparing popular models of different years, which are distinguished by the use of metal elements in the design of the case, which will help to navigate the variety of proposals.

As you can see from the table, all-metal models (frame + rear) are becoming smaller, giving way to hybrid solutions. However, aluminum frame remains the standard for quality devices, providing the necessary rigidity and protection from bending.

Care for metal housing and protection from scratches

The metal body, despite its strength, requires proper maintenance. Anodized layer can wear off over time, especially on the faces where the smartphone most often comes into contact with surfaces. To maintain the appearance, it is recommended to use protective covers with a soft inner coating.

If you have micro scratches on the body, you can try to disguise them with special polishes for metal, but you need to do this with caution, so as not to damage the antenna inserts or logo. For deep dents, polishing will not help - the metal is deformed, and this can only be corrected by replacing the body.

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Use cases with raised sides not only for the screen but also for the camera.The metal frame around the camera lens is often scratched when you install the smartphone on the table.

It is also important to protect the smartphone from contact with salts and aggressive liquids. sweat of hands containing salts, with prolonged contact with poor-quality anodizing can cause corrosion. Regular cleaning of the case with a soft cloth will help to avoid stains and plaque.

Frequently Asked Questions (FAQ)

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Choosing Xiaomi in a metal case, you get better heat sink and durability, but you have to put up with the possible weight and features of signal reception in older models.

In conclusion, choosing a Xiaomi smartphone in a metal case is a matter of personal preference and priorities. If you care about tactile pleasantness, a sense of premium and effective cooling, models with aluminum elements will be a great choice. Despite the dominance of glass in the top segment, metal does not lose ground in the middle class and special series.