Restoring the tightness and integrity of the Xiaomi Redmi Note 7 body is a task that requires not only accuracy, but also the right choice of consumables. This smartphone, despite its popularity and reliability, has a glass back panel that often peels off or breaks when it falls. If the glass is intact but is not strong, you will need a quality adhesive that can withstand temperature changes and mechanical stress.
Incorrectly selected composition can spoil the appearance of the device, leaving traces on the display or oxidizing the internal contacts. In this article, we will examine in detail the chemical properties of various adhesives, their compatibility with the materials of the case and provide a step-by-step algorithm for actions. You will learn why some popular brands are not suitable for this model and what method of fixation will ensure the longevity of the build.
To begin with, it's important to understand what materials we're working with. The Redmi Note 7 body is a combination of tempered glass and aluminum bezel. The adhesive seam must have a certain elasticity to compensate for the thermal expansion of materials when the processor is heated or charged. The use of rigid compounds can lead to re-detachment or even cracks in the glass.
Review of types of glue for smartphones
The market offers many options, but not all of them are suitable for repairing mobile equipment. The most common choice among craftsmen is a specialized glue based on silicone, often labeled as B-7000. This transparent gel of medium viscosity is ideal for gluing glass and metal without leaving yellow spots over time.
Its analogue is the T-7000 glue, which is black, designed for black-framed devices or for masking seams, but in the case of the Redmi Note 7, where the frame is often silver or gold, black glue can be noticeable when applied carelessly. Both compounds have good fluidity, filling micronervousness, and solidify into an elastic mass.
⚠️ Warning: Never use cyanacrylate adhesives (superglue, moment, and their analogues) to fix the lid, they release vapors that instantly settle on the camera and display, forming an ineluctable whitish film, and also make the glass brittle.
Another option is liquid polyurethane sealants, which are often used in the factory, which provide the highest degree of moisture protection, but require special equipment for application and heating for dismantling.
Why is the B-7000 glue better than the others?
Bilateral Scotch as an Alternative
Some service centers use special tapes instead of liquid glue. Double-sided electronics tape, often called 3M, is a thin film with an adhesive layer on both sides, a solution convenient because it eliminates the risk of glue entering the body and allows you to position the cover more accurately.
But there are some nuances to this method: the Redmi Note 7 requires that you cut the tape exactly along the frame, which takes time and a sharp scalpel. If you leave the gaps, the sealing will be broken, and the dust with moisture will penetrate the inside. In addition, the old residues of the factory glue will have to be carefully removed, otherwise the new tape will not lie flat.
The advantage of tape is that it's clean, so you don't have to wait for the glue to dry or use rubber harnesses to hold it for a long time, and you just have to press the lid tight enough, and it's ready to go, and this is especially true if you don't have time to dry it long enough.
- 🔹 High assembly speed and lack of time for polymerization.
- 🔹 Clean process without risk of staining the insides with glue.
- 🔹 Reopening without heating (in some cases).
Tools and training required
Before you start applying the adhesive, you need to prepare the workplace and tools. The quality of repair depends on how well you clean the surfaces of old glue. To work, you will need: a suction cup, a plastic spatula (mediator), tweezers, degreaser (alcohol or isopropyl alcohol) and lilace wipes.
Pay special attention to cleaning the frame. Old adhesive with Xiaomi Redmi Note 7 is quite difficult to remove, as it is often a viscous mass. Use a plastic blade to avoid scratching the aluminum frame, and abundantly wet the residues with alcohol. Metal tools are best not to use to avoid short circuit or damage to the plumes.
☑️ Preparation for bonding
After mechanical cleaning, be sure to degrease. Even the inconspicuous fingers can leave a fatty trace that drastically reduces the adhesion of the new adhesive. Rub the end of the frame and the inner surface of the glass with alcohol and let the surface dry for 1-2 minutes.
Glue application technology
The process of applying the adhesive requires patience and precision. A tube with a B-7000 or T-7000 adhesive has a thin nose, which allows you to squeeze the composition with a thin continuous thread. Apply the adhesive directly to the end of the aluminum frame, trying to hold the tube at an angle of 45 degrees. The layer should not be too thick, otherwise, when you press the lid, the excess will flow out.
It's important to leave small gaps in the plumes and modules if they are close to the edge, even though the Redmi Note 7 has the main plumes in the center. Don't put glue on the glass cover itself, it'll make it harder to control the thickness of the layer. A uniform thread around the frame is key to success.
| Type of glue | Drying time (min) | Complete polymerization | Colour |
|---|---|---|---|
| B-7000 | 3-5 minutes | 24 hours. | Transparent |
| T-7000 | 3-5 minutes | 24 hours. | Black. |
| E-8000 | 5-7 minutes | 48 hours. | Transparent |
After applying the layer, allow the glue to dry slightly for 1-2 minutes. It should stop being liquid and become slightly sticky like scotch. This will prevent it from spreading on initial contact. Then gently set the lid in place, starting on one side, and gradually lower it.
💡
Use a thin line or dental floss to remove excess glue until it is completely frozen, which is faster and safer than picking a frozen glue with a blade.
Fixing and time of polymerization
The most critical stage is fixation. Once the lid is installed, it must be pressed tightly around the perimeter, and special rubber harnesses are ideal for this, which often come with repair kits. If they are not available, you can use 3-4 wide stationery rubber bands crossed cross-cross.
Don't use too tight harnesses that can warp the display or squeeze the glue inside the body onto the camera. The pressure should be uniform and moderate. Leave the smartphone in this state for at least 30-60 minutes for initial grasp. Full polymerization of the adhesive, as indicated in the table above, takes up to 24 hours.
⚠️ Warning: Do not turn the phone on or charge it during the initial fixation. Vibration from the bell or heating from charging can displace the still-stiffened structure, and the leakage will be broken.
The waiting time has a direct effect on the strength of the connection. If you remove the harness in 10 minutes, the lid can go away in a week, let the chemical processes complete, during which time it is better to put the phone on a flat surface with a screen down (on soft fabric) or a screen up, so that the glue under the influence of gravity does not drain to one side.
💡
The quality of gluing is 90% dependent on the purity of the surfaces and the time of exposure under pressure, not the brand of the glue.
Removal of surpluses and finishing
After removing the harnesses, you can see that there's excess glue that's protruding around the edges, and until the glue is completely hardened (in the first couple of hours), you can gently remove it with a finger or a dry lilac wipe, rolling into the coils, and you need to move from edge to center or along the frame so that you don't smear the composition on the glass.
If the glue is already withered, it can be gently cut with a blade, but act extremely carefully so as not to scratch the glass or frame Xiaomi. For difficult cases, use a special liquid to remove the glue, but make sure it is safe for plastic and coatings. In most cases, mechanical removal with a finger after a light drying with a hair dryer works best.
Check all the buttons and sensors. Make sure the glue doesn't get into the charging connectors or speaker. Wipe the body with the final polishing wipe to remove the fingerprints. Now your Redmi Note 7 is back assembled and ready to go.