9D Tempered Glass for Samsung Galaxy A40 – Premium 9H Full Screen Protection
Looking for complete protection for your smartphone screen? The 9D 9H tempered glass screen protector for Samsung Galaxy A40 is a premium solution that will protect your device from unexpected drops, scratches and other everyday damage. This innovative protective glass is designed specifically for the Samsung Galaxy A40, which means it fits perfectly to the lines of your phone and covers the entire screen from edge to edge.
Thanks to advanced 9D technology and an exceptional 9H hardness, this tempered glass acts as an invisible shield that absorbs shocks while maintaining the original touchscreen responsiveness and crystal clear image. Forget about expensive repairs for cracked screens and enjoy worry-free use of your phone every day.
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Why choose 9D tempered glass for Samsung Galaxy A40?
The screen is the most sensitive and most frequently damaged part of a smartphone. Standard screen protectors often do not provide sufficient protection against heavy impacts, while regular glass does not cover the curved edges. Our 9D protective glass solves both problems at once. It is made of specially treated 0.3 mm thick clear glass, which is additionally reinforced for maximum impact absorption.
By purchasing this glass, you are not only investing in the aesthetics of your device, but you are actively extending its lifespan and maintaining its market value. Installation is quick and easy, and the end result is a perfectly smooth screen without annoying air bubbles.
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Key features and technical advantages

Superior 9H Hardness: Extremely resistant to scratches caused by keys, coins or other sharp objects in your pocket or purse.
Advanced 9D Technology: Ensures a perfect fit over the entire screen surface, including the rounded edges, preventing dust from accumulating on the edges.
Only 0.3 mm thick: Extremely thin glass that does not change the dimensions of your phone and ensures smooth operation of sensors and touch responsiveness.
100% Transparency without Haze: High light transmittance ensures sharp images, vibrant colors, and crystal clear display without the effect of surface haze.
Anti-reflective coating: Improves screen visibility in bright light or sunlight and reduces eye fatigue.
Easy, bubble-free installation: The glass adheres perfectly to the screen without creating air pockets, allowing for a professional-looking home installation.

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The main advantages of using 9D protective glass
1. Complete protection against drops and impacts
Specially treated tempered glass works by absorbing the force of a strong impact and distributing it across its surface. In the event of an extreme fall, the protective glass will crack, while the original screen of your Samsung Galaxy A40 will remain completely undamaged. Replacing the protective glass is quick and affordable, while replacing the entire screen is an extremely expensive process.
2. Maintaining impeccable appearance and functionality
The screen covered with this 9D glass is completely transparent. Unlike inferior screen protectors, this premium glass does not cause color distortion or reduce brightness. Your Samsung Galaxy A40 will function and look exactly as it was designed, with an added layer of security.
3. Easy maintenance and cleanliness
Thanks to the smooth surface of the tempered glass, cleaning fingerprints, dust and grease stains is extremely easy. With one swipe of a cloth, the screen will shine again in perfect cleanliness.
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Easy home installation instructions
You don't need any special tools or prior experience to install the 9D screen protector. Follow these simple steps:

Clean the screen: Use the included cleaning kit to thoroughly clean the screen of your Samsung Galaxy A40 to remove all traces of grease and fingerprints.
Remove dust: Use a dedicated sticker to remove micro dust particles, as these can cause bubbles under the glass.
Install the glass: Remove the protective film from the glass, align it precisely with the edges of the screen and the speaker, and gently lower it onto the screen.
Press to Adhere: Gently press on the center of the glass and watch as it automatically and evenly adheres to the entire surface without bubbles.

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Frequently Asked Questions (FAQ)
Does 9D glass affect the responsiveness of the touchscreen?
No. Due to the extremely thin (only 0.3 mm) and high quality 9H tempered glass, the touchscreen's responsiveness remains completely unchanged. Your phone will respond quickly and accurately, as if the glass were not there at all.
What does the 9D and 9H marking mean?
The 9H rating represents the hardness of the material on the Mohs scale, meaning that the glass is extremely resistant to scratches and impacts. The 9D rating means that the glass is designed to completely cover the entire front surface of the phone, including the rounded edges, ensuring an aesthetically pleasing appearance and maximum protection.
Is the glass compatible with phone cases?
Yes, the 9D tempered glass is designed to be compatible with most standard protective cases for the Samsung Galaxy A40. Although it covers the entire screen to the edges, there is a minimal gap at the edges, which prevents the case from lifting the protective glass.
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Don't risk damage and expensive repairs to your smartphone. Get the ultimate protection and keep your Samsung Galaxy A40 in pristine condition. Order your 9D 9H tempered glass screen protector today!


Responsible persons:
r2invest - R2 Invest Sp. z o. o. ul. Mars. J. Piłsudskiego 74/320 50-020 Wrocław, Poland +48 713142604, biuro@r2invest.pl
Distributor for Slovenia: Haloorodje.si, Online Sales, Rok Groznik sp, Podturn 42, 8350 Dolenjske Toplice, info@haloorodje.si, +38669731944, Slovenia
Product origin: China

Instructions for using the product:
• Clean the screen of your device with a damp cloth and remove any smudges or dust.
• Use the provided dry cloth or microfiber to completely dry the screen and remove all moisture.
• Remove the protective film from the protective glass and check that the glass surface is completely clean and free of dust.
• Carefully place the protective glass on your device's screen so that it fits perfectly and leaves no gaps or openings.
• Gently press the center of the glass and push it down until it adheres to the screen.
• If necessary, remove any air bubbles that may appear during installation by pressing on the center of the glass and pushing the bubbles towards the edge.
• Once the glass is fully attached, gently push it across the entire screen to ensure full contact between the glass and the screen.

Useful tips:
• Before installation, make sure your device's screen is completely clean and dust-free to ensure a smooth and flawless installation.
• If air bubbles appear during installation, remove them by pressing in the center of the glass and gently pushing the bubbles towards the edge.
• After installation, allow the glass to dry completely and adhere to the screen before continuing to use the device.
• Check your protection status regularly

Warnings:
• Before installation, make sure you have a Samsung Galaxy A40.
• The Galaxy A40 has a 5.9-inch Super AMOLED display.
• The product is not intended for the Galaxy A41, A42 5G, A50 or A51 models, as they have different dimensions and screen shape.
• Check the exact model number of your phone before purchasing.
• When using a protective case, make sure it does not press against the edges of the glass.
• Cracked tempered glass may have sharp edges – be careful when removing.
• Do not attempt to repair or re-glue damaged glass.
• Do not use a knife or other sharp metal objects when removing.
• Tempered glass helps reduce the chance of screen damage, but does not provide complete protection in the event of a hard drop or impact.

Same summary

The 9D 9H tempered glass screen protector is designed for Samsung Galaxy A40 users who want increased screen protection from scratches and impacts during everyday or more active use of the phone. The glass maintains a natural touch feeling, does not interfere with basic use, and ensures a good fit to the screen due to its specific manufacturing for this model. For users who expect the thinnest or barely noticeable protection, the film would offer a less prominent solution, but tempered glass offers higher mechanical safety.

Recommendation source: Enaa guides and team experience.

User view

The product is a common choice for those who regularly use their phones in various environments - on the go, during sports, at school or at work, where the chances of falls or impacts are higher. Thanks to tempered glass, users are less likely to encounter screen damage, and at the same time they do not have to significantly change the way they use the phone and the feeling of touch. Such protection is also suitable for people who want to keep their Samsung Galaxy A40 flawless for a longer period of time.

Users often choose R2invest brand products because they trust their reputation in the segment of additional protection for phones.

Why buy at Enaa

At Enaa, it's easy to find a screen protector that's exactly right for your phone model, as you can quickly filter between different types and manufacturers. In addition, users can rely on our carefully vetted product descriptions, making it easier to make a decision in the flood of similar protectors.

Answers to frequently asked questions

Will this screen protector interfere with the touch screen sensitivity?

No, high-quality tempered glass, such as this 9D glass, does not reduce the sensitivity of the touchscreen, so the experience of using the Samsung Galaxy A40 remains unchanged.

How often is it recommended to change the protective glass?

Replace the glass when you notice scratches, cracks, or when it loses its grip, as damaged glass no longer provides optimal protection.

Does this glass cover the entire screen or just the middle part?

The 9D tempered glass is designed for maximum coverage and fits over most of the Samsung Galaxy A40's screen surface, including the slightly rounded edges.

Can I install the protective glass myself if I have no experience?

Yes, installation is usually easy, but it is important to thoroughly clean the screen beforehand to prevent bubbles or poor adhesion. The included instructions or installation kit can make the process easier.

Does the protective glass affect the visibility or colors of the screen?

The transparent tempered glass has minimal impact on visibility or color rendering, so the display on the screen remains clear and natural.

Description updated: April 2026