Article 1 | Why “self-cleaning glass” isn’t necessarily truly self-cleaning?

Jan 21,2026

I. A question you may not have thought about carefully:
Why do some glasses, despite being “self-cleaning,” still appear dirty?


If you pay close attention, you’ll notice a very interesting phenomenon:
                Many glasses marketed as “self-cleaning”
It really does get cleaner after it rains.


         But once the sunny weather lasts for a while, dust still accumulates layer upon layer.
Once it hasn't rained for several days in a row.
The surface appears gray and dull.
Light transmittance decreases
Even dirtier-looking than ordinary glass.
This isn’t a construction issue, nor is it a case of the product “failing”—rather—
         Most traditional self-cleaning coatings were never designed for “rain-free environments” in the first place.

 

II. The True Logic Behind Traditional “Self-Cleaning”:
Essentially, it’s a “cleaning by waiting for rain” technique.


Let’s first clarify a concept that is often blurred:
                The vast majority of traditional self-cleaning glass rely on just one condition to function: rain.
        

Its working logic is as follows:
The glass surface is designed to... Hydrophilicity
When it rains, the rainwater doesn't form droplets.
Instead, it spreads out into a continuous layer of water film.
This layer of water film flows downward under the influence of gravity.
“Take away” the surface dust and stains together.

Sounds perfect, doesn't it?
                But the question is:
What if it doesn’t rain?
What if it’s just slight dampness, dew, or mist?
What if the environment is characterized by little rainfall, dryness, high winds, and a lot of dust?


The answer is simple:
👉 It won't clean itself.

 

3. The root of the problem isn't "the water"; rather, it lies in "how the dust got stuck in the first place."
This is the key point that most marketing campaigns deliberately avoid addressing.


We are usually told:
Dust = washed away by rainwater
But very few people ask:
                What initially causes dust to “stick” to glass?
The answer is two words:
👉 Static electricity

 

Four, dust doesn't "fall down"; rather, it's "sucked up."


In a real-world environment:
The glass surface, under the influence of sunlight, wind, and temperature differences,
         Extremely prone to static electricity accumulation.
Dust in the air, PM2.5, and mineral particles
It often carries an electric charge itself.
         Opposite charges attract each other.
So—
Dust doesn't "naturally settle"; rather, it is adsorbed onto surfaces.
        

This is also why:
Even in weather with almost no wind.
Even if the glass is installed vertically.
The dust will still stubbornly “cling” to it.


         Traditional self-cleaning coatings address:
👉 How the dust is washed away by water
         But it hasn't been resolved:
👉 Why does dust “stick so firmly”?

 

V. Thus, a fundamental contradiction emerged.
We can summarize the logical flaw in traditional self-cleaning coatings with a single sentence:


It assumes that “the dust is only temporarily lingering.”
However, it overlooks the fact that “dust is actively adsorbed.”


This leads to a real-world outcome:
                No rain → Static electricity persists → Dust continues to adhere
Even if the surface is hydrophilic.

                But without the participation of water, there is no “cleaning action.”

 

VI. The Real Breakthrough:
It’s not about “waiting for the rain,” but rather “preventing dust from sticking.”


This is precisely our product. Self-cleaning, dust-repellent, ultra-hydrophilic nano-coating
Compared to traditional products Fundamental difference 。


We’re not “optimizing cleaning efficiency during rain.”
But rather in Change the relationship between dust and glass. 。

 

7. Our core logic, explained in one sentence.
         Traditional self-cleaning:
It only gets clean when it rains.
         Our self-cleaning:
It doesn’t get dirty easily even when it’s not raining, and it’ll be even cleaner when it rains.


This isn’t an advertising slogan—it’s rather... A completely different technological approach 。

 

8. Breaking down our “self-cleaning without rain” principle into three steps
Step 1: Anti-static—Cutting off the primary driving force behind “dust attraction”


The coating is built on the glass surface. Stable low-static interface
Static electricity no longer continues to accumulate.
The dust loses the driving force of “being adsorbed.”


The result is:
Dust is easier to be blown away by the wind.
Even if it lands on the surface, it merely “rests” on top of it.

Step 2: Superhydrophilicity—transforming water from a “condition” into an “amplifier.”


We’re not simply being “hydrophilic”—rather, we’re... Stable, long-term superhydrophilicity ：
Air humidity
Nighttime dew formation
Tiny raindrops
Clean the residual water film
All can form a continuous water layer on the surface.
         Rather than scattered droplets

Step 3: Wind + Micro-water = Continuous “Passive Self-Cleaning”


In this state:
Wind → carries away loose dust
Trace amounts of water → Reduce friction and adhesion between dust and surfaces
Rainwater → Simply “Deep Cleaning Mode”


9. Use a relatable, everyday analogy to thoroughly explain the difference.


Imagine two desktops:
Desktop A:
The surface is prone to static electricity.
As soon as dust settles, it sticks.
You can only rely on “wiping with water.”
Desktop B:
Does not generate static electricity
The dust is gone with just a gentle blow.
Wipe it occasionally, and it’ll be exceptionally clean.


Traditional self-cleaning glass = Desktop A
Our product = Desktop B
The difference isn't whether it's wiped clean or not.
Rather, it’s about **“whether it gets dirty easily.”**

 

Ten, what does this mean?
A new “self-cleaning evaluation standard” is emerging.


In the past, self-cleaning had only one issue:
         Is it clean after the rain?


Now, we pose a more realistic question:
         Can it stay clean for a long time if it doesn't rain?


This is particularly critical for the following scenarios:
Photovoltaic glass
Curtain wall glass
Industrial factory skylight canopy
Rain-scarce, dry, and dusty region
High-altitude glass structures that are difficult to clean frequently.

 

XI. Summary of This Section
Traditional self-cleaning ≠ Always-on self-cleaning

The key isn't “water-washability”; it's “anti-adhesion capability.”

Anti-static + Superhydrophilic
This is the self-cleaning path that’s truly suited to real-world environments.
         What we’re addressing is:
                Even without rain, it “doesn’t get dirty easily.”

Previous： Article 2 | Why do glasses that are “more hydrophilic” sometimes get dirty more easily?

Next： [Industry Watch] When Photovoltaics Meet Nanotechnology: Hysense Mecre Redefines Power Generation Efficiency with “Smart Membranes”

Other Blogs