GM-BL Glass Nano Heat-Insulation Coating
Targeted nano ATO + CWO solar control coating that blocks up to 95% of infrared heat and 99% of UV while keeping glass clear — room-temperature cure, 5H hardness, 3,000 h weathering.
Transparent Solar Control for Glass, Backed by Nano Engineering
GM-BL is a solvent-based two-component nano heat-insulation coating developed by Dalian Gomin Special Coating Co., Ltd. It combines ATO (antimony-doped tin oxide) nanoparticles — valued for their metallic electrical conductivity and high infrared emission — with CWO (cesium tungsten oxide) particles that deliver targeted near-infrared absorption with outstanding visible-light transparency. Surface modification of the ATO particles suppresses agglomeration, while finely milled CWO ensures a stable, uniform dispersion in a film-forming binder engineered for high transparency, high hardness, strong adhesion, and resistance to freeze-thaw cycles, water, acids and alkalis.
The result is a pale green/blue liquid that cures at room temperature into a nearly invisible functional layer on glass. Unlike tinted films, it never peels at the edges, never bubbles, and can be applied on-site with a simple brush, roller, squeegee or flow-coating process — making it a practical retrofit for existing building envelopes where replacing glazing or applying window film would be costly or prohibited.
Why Heat Rejection Works Best on the Outside
Solar heat is best stopped before it enters the glass. Applied on the exterior surface (face #2 of a single pane), GM-BL reflects and absorbs the majority of incoming infrared radiation, so less heat ever crosses into the interior. This is why the coating performs dramatically better outdoors than indoors — and why it also unlocks applications where films are simply not allowed, such as public transport glazing that must remain breakable for emergency escape.
Key Performance Advantages
High Heat Rejection
Infrared blocking rate above 90%: 93–95% measured on single coated panes.
High UV Blocking
200–380 nm ultraviolet band blocked at 90%+; up to 99% on coated glass.
Hardness ≥5H
Cured film reaches 5H pencil hardness with 500 g scratch resistance.
10,000 Scrub Cycles
Wet-abrasion test: 10,000 scrub cycles without exposing the substrate.
Grade 0 Adhesion
Cross-cut adhesion to glass substrate rated Grade 0 — the best rating.
Water & Weather Durable
Boiling-water resistant; nano ceramic particles keep insulation from fading.
Measured Optical Performance
Single-pane glass coated with GM-BL (film on face #2, counting from outside to inside) delivers the following typical optical values:
| Pane Thickness (mm) | Visible Light Transmittance | Infrared Blocking Rate | UV Blocking Rate | Solar Heat Gain Coeff. (SHGC) |
|---|
| 4 | 70% | 93% | 98% | 0.415 |
| 5 | 70% | 94% | 98% | 0.410 |
| 6 | 69% | 95% | 99% | 0.400 |
Typical laboratory values; actual performance may vary with application conditions.
Coated vs. Ordinary Glass at a Glance
| Optical Parameter | Ordinary Glass | GM-BL Coated Glass |
|---|
| Infrared blocking rate | 22% | 93% |
| Ultraviolet blocking rate | 20% | 99% |
| Visible light transmittance | 88% | 68% |
| Solar heat gain coefficient (SHGC) | 0.848 | 0.419 |
| Heat-transfer temperature differential (°C) | 15 | 0.8 |
Typical values measured with dedicated laboratory instruments; performance may fluctuate with real conditions.
Physical & Weathering Properties
| Property | Result |
|---|
| Film appearance | No abnormality |
| Surface dry time | < 0.5 h |
| Room-temperature cure adhesion (cross-cut, 1 mm) | Grade 0 |
| Pencil hardness | ≥ 5H |
| Scratch resistance | No scratch at 500 g load |
| Scrub resistance | 10,000 cycles, no substrate exposure |
| Water resistance | Indoor type 100 h / Outdoor type 500 h |
| Alkali resistance (5% saturated Ca(OH)2) | Indoor type 72 h / Outdoor type 300 h |
| Acid resistance (acetic acid solution) | Indoor type 72 h / Outdoor type 300 h |
| Boiling water resistance | 1 h at 80°C, no abnormality |
| Artificial weathering (3,000 h) | No blistering or wrinkling; gloss loss 0%; chalking Grade 0; adhesion Grade 0 |
Where GM-BL Delivers Value
- Building doors, windows & curtain walls — cut cooling loads on west- and south-facing glazing without replacing glass.
- Skylights and overhead glazing — exterior application gives the best heat rejection and a safer, faster workflow than indoor work at height.
- Public transport glazing — solar control where escape-breakable glass rules out film laminates.
- Transparent plastics, acrylic panels & optical panels — the same targeting chemistry extends beyond silica glass.
Application Guide
Tools You Need
GM-BL targeted glass insulation coating (A + B components), thinner, glass polishing powder, sponge brush, lint-free cloth, material tray, brush board, scouring pad and dropper.
Step-by-Step Process
- Mix: For each day’s planned usage, add component B into component A at a 1:1 ratio and shake for 1–2 minutes.
- Prepare the glass: Scrape off adhered matter with a scraper and mask the window frame with residue-free masking tape.
- Polish: Re-polish the glass surface with glass polishing powder — essential where oil contamination is heavy.
- Final clean: Wash with a dilute detergent solution, wipe dry and let the glass air-dry naturally.
- Coat: At 20–25 g/m², pour the mixed coating into the tray and apply evenly with a sponge brush, finishing top-down; allow to level and dry. Do not touch after application and keep the surface unwashed for 3–5 days so the film cures fully. Normal cleaning can resume afterwards.
Curing, Storage & Packaging
| Item | Requirement |
|---|
| Cure | Room-temperature curing; stable storage ≥ 1 year |
| Packaging | 1 kg per bottle; 25 kg per drum |
| Storage | Store in a cool, dry place |
Precautions
- For outdoor work, ensure no rain within 24 hours and apply in the early morning or evening; avoid hot weather that cures the coating too fast. Indoor application should keep ambient temperature below 30°C.
- Thinner is normally unnecessary. In ambient temperatures above 30°C, add thinner step by step at 10–50% — never exceed 50% of the total usage.
- Test compatibility on acrylic or polycarbonate substrates before full-scale application on transparent plastics.
Frequently Asked Questions
Will the coating make my windows look tinted?
The cured film is nearly invisible with only a very faint green-blue cast. Visible light transmittance remains about 68–70%, so interiors stay bright while 93%+ of infrared heat and 98–99% of UV are blocked.
Indoor or outdoor application — which is better?
Outdoor (exterior face) application is strongly recommended: the physics of solar heat rejection means GM-BL performs far better when solar energy is stopped before it penetrates the pane. Overhead glazing is also safer and faster to coat from outside.
How durable is the film?
Very. It passes 10,000 scrub cycles without breaking through, holds pencil hardness ≥5H with 500 g scratch resistance, shows Grade 0 cross-cut adhesion, and after 3,000 hours of artificial weathering shows zero gloss loss, zero chalking and Grade 0 adhesion. Outdoor-grade versions resist 500 h water and 300 h acid/alkali immersion.
Can it replace window films?
In most retrofit scenarios yes — and in some it is the only option. Public transport and emergency-escape glazing often prohibit film structures; a coating keeps the glass breakable while still providing solar control.
What is the coverage and shelf life?
Apply at 20–25 g per square meter. The liquid is stable for at least one year when stored in a cool, dry place. Once A and B are mixed at 1:1, use the batch the same day.
Ready to Cut Solar Heat Without Losing Daylight?
Contact Dalian Gomin Special Coating Co., Ltd. for GM-BL samples, technical data and project support.
Tel: +86 15134565556 | www.mescocoating.com
