MH-W – Waterproof Strontium Aluminate Photoluminescent Pigment
MH-W Series: Waterproof Photoluminescent Pigment
The MH-W Series is a range of encapsulated photoluminescent pigment based on strontium aluminate or calcium aluminate, featuring waterproofness, high luminosity and long afterglow.
Standard photoluminescent pigment is moisture-sensitive: when exposed to water or high-humidity environments, the crystal structure hydrolyzes and its luminance drops significantly. The MH-W series solves this by encapsulating the photoluminescent pigment with inorganic coating, giving the glow in the dark powder a protective barrier that maintains full luminance performance in water-based systems and outdoor applications.
MH-W waterproof photoluminescent pigment can be used directly in water-based paint, ink and coating systems. Suitable for outdoor or marine environments.
- ● Global Certifications: Non-toxic. Non-radioactive. Compliant with international standards, including EU REACH, RoHS, and ASTM regulations.
- ● Long Afterglow: After 10–20 minutes of light absorption, it can glow for more than 12 hours in the dark continuously.
- ● Long Service Life: Chemically stable and highly weatherproof. Shelf life exceeds 10 years under standard storage conditions.
Technical Specifications
Each color is offered in many models with different particle size and afterglow intensity to match your specific formulation or application requirements.All MH photoluminescent pigment grades are available in waterproof encapsulated versions, designated by the suffix "-W".
The table below shows the most used grades. For complete specifications by color, see individual product pages linked below or contact our technical team.
| Type | Model | Size (D50)μm | Afterglow intensity (mcd/㎡) | Glowing color (Night) | Appearance (Daytime) | |
|---|---|---|---|---|---|---|
| 10min | 60min | |||||
| MHG — Yellow-Green
Highest afterglow intensity Most widely used |
MHG-6CW | 60±5 | 600 | 88 |  |
 |
| MHG-6DEW | 30±3 | 450 | 65 | |||
| MHG-4CW | 60±5 | 550 | 80 | |||
| MHG-4DW | 40±3 | 500 | 70 | |||
| MHG-4EHW | 24±3 | 380 | 52 | |||
| MHG-2DEW | 30±3 | 370 | 45 | |||
| MHB — Blue-Green | MHB-4CW | 60±5 | 380 | 55 |  |
 |
| MHB-4DW | 40±3 | 320 | 45 | |||
| MHB-3DEW | 30±3 | 180 | 25 | |||
| MHSB — Sky-Blue | MHSB-9DW | 35±5 | 65 | 11 |  |
 |
| MHP — Purple | MHP-6DW | 35±5 | 18(2min) | 4(10min) |  |
 |
* Note: Afterglow intensity measured under D65 standard light source at 1,000 lux for 10 minutes excitation.
Need to test compatibility with your water-based system?
Share your product type and application details. We will recommend the most suitable MH-W model and arrange a free sample for you.
Why Source Your Photoluminescent Pigment with Minhui: China's Leading Photoluminescent Material Manufacturer
Founded in 2003, Zhejiang Minhui Luminous Technology Co., Ltd. is one of the largest and most established manufacturers of photoluminescent pigment and photoluminescent materials in China. With a 47,000 m² facility and a $15.8M USD investment, we provide unmatched capacity and technical expertise, delivering tailored glow in the dark solutions to customers across 50+ countries.
When you source glow in the dark powder from Minhui, you get direct access to:
● Verified Production Capacity: We operate 7 kiln lines and 70+ powder processing units, with a stable annual output of 500+ metric tons of photoluminescent pigment. No supply chain risk. No middlemen.
● Strong R&D Team: With 5 specialized laboratories, 200+ global patents, and annual R&D investment exceeding $500,000 USD, our technical team can develop custom photoluminescent pigment grades tailored to your specific luminance level, particle size and color.
● Industry Authority: We are a key contributor to 3 national and industry standards for photoluminescent products in China, a management member of the Photoluminescent Safety Products Association (PSPA), and a member of the China Rare Earth Association. We don't just manufacture to standards — we help write them.
● Quality You Can Certify: ISO 9001-certified quality management system. Full traceability from raw material to finished pigment. Trusted OEM/ODM supplier to globally recognized brands.
Ready to evaluate MH-W waterproof photoluminescent pigment for your application? Contact us for factory pricing, grade recommendations, and free samples.
Frequently Asked Questions (FAQ)
A: Yes. MH-W series is specifically engineered for direct dispersion in water-based paint and ink systems. No surface treatment or solvent pre-mixing is required.
A: MH series is standard strontium aluminate photoluminescent pigment: high luminance, suitable for solvent-based systems, plastics, and dry applications.
MH-W series photoluminescent pigment is the encapsulated waterproof version of MH, with identical glow performance but full resistance to water and humidity. Choose MH-W whenever moisture contact is expected.
A: Particle size directly affects both afterglow brightness and product quality. Here is a general guide based on application type:
| Application | Recommended Grade | D50 Particle Size | Notes |
|---|---|---|---|
| Screen printing | D grade | 40±3 μm | Balances brightness with printability |
| Spray painting | E grade | 24±3 μm | Finer particle prevents nozzle clogging |
| Coating (knife / roll) | C or D grade | 40–60 μm | Suitable for most coating lines |
Not sure which grade fits your system? Share your application details and we will recommend the most suitable MH-W model and send a sample your way.
A: After 10–30 minutes of exposure to visible light or UV light, MH-W waterproof photoluminescent pigment emits continuous afterglow for more than 12 hours (measured to 0.3 mcd/m²).
A: Yes. The encapsulation process used in MH-W series glow in the dark powder is specifically designed to withstand prolonged water immersion. It is suitable for marine safety products, outdoor signage, and installations subject to rain and condensation. Contact us to discuss your specific conditions.
A: Yes. MH-W series strontium aluminate pigment is non-toxic, non-radioactive, and skin safe. It is compliant with EU REACH, RoHS, and ASTM F963-16. It is suitable for consumer products and industrial applications.
A: Please contact us directly. We accommodate both sample requests and bulk orders, and can advise on the most suitable grade for your application.
A: Yes. We provide free samples for qualified buyers for evaluation. Please contact us with your application details and target system — we will recommend the most suitable grade and arrange shipment.