How to glue the protective glass on Xiaomi Redmi 9: detailed instructions with photos and tips

The protective glass on Xiaomi Redmi 9 is not a luxury, but a necessity: the screen of the smartphone with HD+ 1600×720 resolution and a diagonal of 6.53 inches is vulnerable to scratches, chips and even cracks when falling. However, many users face problems when installing: air bubbles, dust under the glass, improper positioning or rapid wear of protection. This article will help avoid all pitfalls and paste the glass perfectly the first time.

The Redmi 9 features slightly rounded edges and a drop-shaped cutout for the front camera, which requires a special approach: standard "universal" glasses are often not suitable, and improper installation can lead to detachment of the edges or discomfort when using. We will analyze not only the basic sticker technology, but also the choice of the optimal type of glass (2D, 2.5D, 3D), surface preparation with regard to the oleophobic coating of the screen, and how to fix defects if something goes wrong.

Important: the procedure requires patience and accuracy. Even a small speck of dust under the glass can ruin the result, and the rush often leads to distortions. If you have never glued the protection yourself, do not worry: following our recommendations, you will do as well as a professional.

1.What kind of security glass to choose for Xiaomi Redmi 9?

Not all glasses are equally useful. For Redmi 9, it's critical to consider three things: edge type, thickness, and oleophobic coating.

• 🔹 2D-glass: the simplest and cheapest, with straight edges, suitable if you don't plan to use a case with high sides.
• 🔹 2.5D-glass: slightly rounded edges (radius) ~2.5mm), which smoothly transition to the side edges of the screen, the optimal choice for the Redmi 9, as it repeats the shape of the original display.
• 🔹 3D-glass: full screen covering with bend on the ends, expensive, but provides maximum protection, requires precise installation - errors lead to detachment.
• 🔹 Black-framed glass: masks the edges of the display, visually zooming in on the screen, if your Redmi 9 already has chipped edges.

The thickness is optimal – 0.2-0.33 mm. Thinner glass (for example, 0.15 mm) is worse protection against impact, and thick (> 0.5 mm) can impair the sensitivity of the sensor. Note the hardness on the Mohs scale: minimum 9H (this means that the glass is resistant to scratches from keys or coins).

Tip: buy glass with oleophobic coating – it repels greasy finger marks and facilitates the care. Also included should be alcohol wipes, dust detector sticker and positioning sticker (more on this in the next section).

2. Preparation of the Xiaomi Redmi 9 screen for the sticker

This is the most important step! Even a perfectly matched glass won't lie flat if the screen is dirty. Redmi 9 often leaves traces of previous protection, greasy spots or microparticles of dust that are not visible to the naked eye.

What you need:

• 🧴 Alcohol wipes (or isopropyl alcohol) + rag-cloth).
• 🧲 Dust sticker (usually complete with glass).
• 💨 Compressed air cylinder (optional, to remove dust from speakers).
• 📏 Plastic card or mediator (for smoothing glass).

Step-by-step training:

1. Turn off the phone and remove it. SIM-Memory card (if they interfere with the).
2. Remove the old glass or film. If it's glued heavily, put a plastic card on the edge (not metal!).
3. Wipe the screen with an alcohol napkin in circular motions, paying attention to the edges and areas around the camera.
4. Let the alcohol evaporate (10-15 seconds) Don't blow on the screen, it will add saliva or dust!
5. Stick a dust-retardant sticker and carefully remove it - this will remove the microparticles.
6. Check the screen under bright light: If you see any swelling or villi, repeat the cleaning.

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If you have sticky traces of old glue on the screen, use Scotch tape: glue it to the problem area and abruptly tear it off. Repeat until the surface is perfectly clean.

⚠️ Warning: Do not use household chemicals (such as window washing products) - it can damage the oleophobic screen covering. Also avoid paper wipes: they leave the pile.

3. Step-by-step instruction: how to glue glass without bubbles

Now, to the most critical stage, the rule is, take your time and don't press on the glass, it has to lie down by itself under the action of the adhesive layer.

Step 1. Positioning the glass

• 📱 Take the glass by the edges (without touching the glue side!).
• 🔍 Combine the cutout under the camera and the edges of the screen.The kit often has a positioning sticker - stick it on the top of the phone to lock the glass.
• 🖼️ Carefully lower the glass onto the screen, starting at the top (camera side!

Step 2. Smoothing

• 💳 Take a plastic card or a mediator, and from the center, move the air bubbles to the edges in a smooth way.
• 🌀 Move from the center to the edges with a Christmas tree – this will prevent the formation of new bubbles.
• 🔍 Check the result under bright light. Small bubbles (up to 1 mm) can disappear on their own in 12-24 hours.

Step 3 Final check

• 📱 Turn on your phone and check the sensor sensitivity (especially around the edges).
• 🔍 Make sure the glass does not interfere with the approach sensor (when ringing the screen should go out).
• 🛠️ If defects are found (large bubbles, dust), gently tuck the glass and repeat the procedure.

⚠️ Warning: If the glass is crooked, don't try to move it with your fingers, it will lead to bubbles.

4.Typical mistakes and how to avoid them

Even the most experienced users sometimes make mistakes, and here are the most common problems and solutions.

Another common problem is the rainbow effect, where you can see colored divorces from a certain angle, and it's because of:

• 🌈 Poor quality glue layer (especially in cheap glass).
• 💦 Moisture between the glass and the screen.
• 🔧 Incorrect pressure when smoothing.

If you get iridescent, try to heat the glass with a hair dryer (at minimum power!) to help spread the glue evenly, and if it doesn't work, you'll have to replace the glass.

5 How to care for a protective glass so that it lasts longer

The average life of glass is 6-12 months, but with proper care, it can last longer.

• 🧼 Cleaning: Use a microfiber cloth (as for glasses) and special wipes for electronics. avoid abrasives!
• 📱 Storage: Do not put your phone down on hard surfaces (tables, window sills). 9H-glass can be scratched by sand or metal objects.
• 💧 Moisture: If the glass gets wet (for example, in the rain), dry it naturally. Do not use a hair dryer or battery - this can deform the adhesive layer.
• 🔄 Replace: If the glass has deep scratches or chips, replace it – it no longer protects the screen at 100%.

Notice the oleophobic coating, which wears off over time and leaves greasy marks on the glass, and can be repaired with special liquids (like Liquid Oleophobic Coating), but it is easier to replace the glass.

⚠️ Warning: If you use a Xiaomi Redmi 9 with a case, make sure its edges don't press on the glass.This can cause perimeter protection to detach.

6. Alternatives to protective glass: should we consider?

Not everyone likes glass, which can add thickness to a phone or reduce the brightness of the screen.

• 📄 Hydrogel (liquid glass): Apply as a coating and freeze under a UV lamp. Pros: invisible, not felt on the screen. Cons: weak shock protection, lifespan ~3–6 months.
• 🧻 Film: Cheap, but it doesn't really protect you from chipping. It's fine if you're careful with your phone.
• 🛡️ Ceramic coating: Applying in service centers, expensive, but providing protection at glass level without increasing the thickness.

For the Redmi 9, we recommend a protective glass, which is optimal in terms of price/quality/protection, and a hydrogel is suitable if you change your phones often and do not want to waste time on a sticker.

7.Where to buy quality glass for Xiaomi Redmi 9?

The price of glass varies from 200 to 1000 rubles. Cheap options (up to 300 rubles.) often have poor glue or low hardness (8H instead of 9H). The optimal budget is 400-600 rubles. for glass with an oleophobic coating and a full set for installation.

Where to buy:

• 🛒 Official stores: Mi Store, Xiaomi Shop - glass certified for Redmi 9.
• 🌍 Marketplaces: Wildberries, Ozon, AliExpress. Look for sellers with a rating above 4.8 and reviews with photos.
• 🔧 Service centers: Many workshops sell glass and can install it professionally (cost of work — ~200-300 rubles.).

Before buying, check:

• 📋 Compatible with the model (Xiaomi Redmi 9, not Redmi Note 9!).
• 📦 Availability in the set of wipes, dust collector and instructions.
• ⭐ Rating and reviews (especially pay attention to photos of real customers).

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Don’t skimp on screen protection – repairing the display Xiaomi Redmi 9 will cost 5-10 times more than quality glass.

FAQ: Answers to Frequent Questions