M888 Water-Based Conformal Coating
Product Applications:
M888 is a one-component, water-based polyurethane conformal coating formulated with waterborne polyurethane resin, functional additives, and deionized water. It is designed to protect printed circuit boards (PCBs), electronic assemblies, and compatible components while supporting low-odor coating operations.
This water-based conformal coating offers a high-gloss finish, strong adhesion, good flexibility, and excellent solvent resistance. Its self-crosslinking formulation dries under ambient conditions, while heat curing is recommended to support efficient drying and coating performance in production environments.
M888 is suitable for application by brushing and dipping, making it a practical solution for PCB protection, electronic moisture protection, and manual or batch coating processes. The product is non-fluorescent, making it suitable for applications where fluorescent materials are not desired.
With its water-based formulation, extremely low odor, and non-flammable, non-explosive characteristics, M888 is an effective conformal-coating option for electronic manufacturing environments seeking a lower-odor alternative to conventional solvent-based coatings.
- Description
- Technical Data
- FAQ
Description
Product Features:
· Eco-Friendly & Safe
Water-based polyurethane formula. Ultra-low odor, non-flammable, non-explosive, and halogen-free. No fluorescent agents. Designed with the latest environmental protection concept.
· Superior Film Performance
High-gloss finish with excellent adhesion, flexibility, and solvent resistance. Delivers durable, reliable protection for your PCBs and components.
· Flexible Application
Single-component, self-crosslinking cure. Air-dry capable with enhanced performance when baked. Suitable for both brushing and dipping processes.
Physical Properties：
| Color / Appearance | Translucent liquid | |
| Viscosity | 120±30CP | |
| Thinner | Deionized water | |
| Drying Time | 25℃ | Tack-free: 60 min; best at RT: 7 days |
| 80℃ | Tack-free: ≤10 min; full dry: 3-5 h | |
| Recommended cure | 80℃ 3-10 min + RT standing | |
| Non-Volatile Content (%) | 30±2 | |
Electrical Properties:
| Dielectric Withstand Voltage | >1500V |
| Dielectric Constant | 2.6 |
Chemical Properties:
| Insulation Resistance (MIL-46058C) | >2*1012Ω |
| Moisture Resistance (MIL-46058C) | >5*109Ω |
Data above measured in lab after 7 days at RT, for reference only. In practice, rely on actual tests per specific product requirements.
Process & Precautions：
· Cleaning: the surface to be coated must be cleaned to remove dust, oil and post-solder residues, which effectively improves adhesion and prevents corrosion of components and solder joints.
· M888 is suitable for brushing and dipping processes. Users can adjust viscosity and film thickness with deionized water to achieve the best results for their own process requirements.
· M888 cures by self-crosslinking; do not pour used product back into the original pail, so as not to affect product stability.
· Performance tests must be conducted after the film is completely dry; room-temperature drying requires 7 days.
Note: when used on circuit boards, clean the board first and then apply the coating, so as not to affect adhesion and wetting performance.
Packaging, Storage/Transport & Shelf Life：
· Packaging: metal pails, 4 KG/pail, 20 KG/pail
· Storage & transport: flammable chemical — keep away from fire and heat; handle per regulations; store cool (RT), dark and dry.
· Shelf life: stored sealed, 6 months at 5-25℃.
Frequently Asked Questions
What is the minimum order quantity (MOQ) for M888?
The standard MOQ for M888 is one 4 kg pail. For trial quantities below the standard MOQ, please contact us for sample availability and a customized quotation.
What packaging options are available?
M888 is available in the following standard packaging options:
- 4 kg per pail
- 20 kg per pail
Please contact us for bulk-order pricing, customized packaging, or OEM labeling requirements.
Can I request a sample before placing a bulk order?
Yes. Free samples are available for quality evaluation and application testing. Please contact us to confirm sample availability and quantity. The customer is responsible for shipping costs.
What is M888 used for?
M888 is a one-component water-based polyurethane conformal coating designed for the protection of printed circuit boards (PCBs), electronic assemblies, and compatible electronic components. It is suitable for applications requiring low-odor coating operations and a non-fluorescent protective film.
What application methods are suitable for M888?
M888 is suitable for brushing and dipping. Application settings, coating thickness, and drying conditions should be adjusted according to the substrate, equipment, and production requirements.
How does M888 dry and cure?
M888 dries under ambient conditions through a self-crosslinking mechanism. Heat curing or baking is recommended to support faster drying and consistent coating performance in production applications. Actual drying and curing time depend on coating thickness, temperature, humidity, airflow, and the curing process.
Is M888 a low-odor and water-based conformal coating?
Yes. M888 is formulated with water-based polyurethane resin and deionized water, providing an extremely low-odor alternative to conventional solvent-based conformal coatings.
Is M888 fluorescent?
No. M888 is a non-fluorescent conformal coating, making it suitable for applications where fluorescent materials are not desired.
What properties does the cured coating provide?
After curing, M888 forms a high-gloss protective film with strong adhesion, good flexibility, and excellent solvent resistance. Please refer to the Technical Data Sheet (TDS) for verified electrical, mechanical, and environmental performance data.
How should M888 be stored?
Store M888 in a cool, dry place away from direct sunlight and excessive heat. Keep the pail tightly closed when not in use. Protect the product from freezing during storage and transportation. Please refer to the TDS and SDS for detailed storage and handling instructions.
How should tools and equipment be cleaned?
Cleaning recommendations depend on whether the coating has cured. Please contact our technical team for the recommended cleaning method for brushes, dipping equipment, and production tools.
What is the shelf life?
The shelf life is 6 months shelf life if unopened when stored under recommended conditions. Please check the product label or contact us for batch-specific information.
Does M888 meet environmental compliance requirements?
M888 complies with applicable RoHS, REACH, and halogen-free requirements. Technical and compliance documents, including TDS, SDS, COA, and available declarations, can be provided upon request.
Do you offer technical support?
Yes. Our technical team can assist with coating selection, PCB compatibility testing, brushing or dipping processes, drying and baking recommendations, and customized packaging requirements.