Protective conformal coating. Dow DOWSIL Q1-4010 Conformal Coating Clear is a one-component, heat-curing, solvent-free elastomer used as a protective coating for printed wiring boards, sensitive components, and flexible and rigid circuit boards. It offers medium viscosity, UV indicators for inspection, and mechanical and environmental protection.
How conformal coatings work. Conformal coatings are applied in thin layers, typically a few mils or microns, onto printed circuits or other substrates. They provide proven, cost-effective environmental and mechanical protection that can significantly extend the life of the components they cover, guarding against moisture, contaminants, and mechanical stress.
Cure and processing. Q1-4010 is a stress-relieving, no-solvent-added coating with rapid, versatile cure processing controlled by temperature. Time to cure depends on film thickness, oven type, and board population density; large, heavily populated boards can take longer because their greater thermal mass takes extra time to reach temperature.
Adhesion and recognition. Dow conformal coatings are formulated to adhere to most common substrates; on difficult, low-surface-energy surfaces, adhesion may be improved by priming or by surface treatment such as chemical or plasma etching. Q1-4010 is UL, IPC, and MIL recognized, and its good adhesion allows use with many low-solids (no-clean) and no-lead solders.
Recommended For
Protective coating of printed wiring boards
Protecting sensitive components
Flexible and rigid circuit boards
Applications needing UV-inspectable coatings
Environments requiring environmental and mechanical protection
Product Details
Product type: One-part silicone conformal coating
Color: Clear / transparent
Viscosity: Medium viscosity
Cure: Heat cure (temperature-controlled)
Solvent: Solvent-free / no solvent added
Inspection: UV indicators for inspection
Recognition: UL, IPC, and MIL recognized
Container size: 18.1 kg pail
Primary Industries
Electronics and PCB manufacturing
Aerospace and defense electronics
Industrial electronics
Communications equipment
Standards and Certifications
UL recognized
IPC recognized
MIL (military specification) recognized
FAQs
What is DOWSIL Q1-4010 used for?
It is a one-part silicone conformal coating applied in thin layers to printed wiring boards, sensitive components, and flexible or rigid circuit boards. It provides environmental and mechanical protection that helps extend component life, and its UV indicators let inspectors verify coverage under ultraviolet light after application.
Why does the coating contain UV indicators?
UV indicators make the otherwise clear coating fluoresce under ultraviolet light, so operators and automated optical inspection systems can confirm that every intended area is coated and spot any gaps or misses. This supports quality control on populated boards where a transparent coating would otherwise be hard to see.
Is Q1-4010 solvent-free?
Yes. Dow describes it as a solvent-free, no-solvent-added elastomer, which avoids the emissions and handling concerns associated with solvent-borne coatings. It is a stress-relieving, medium-viscosity coating, and because it adds no solvent, there is no solvent flash-off step required before the heat cure develops the film.
How is it cured?
Q1-4010 is heat-cured, with cure controlled by temperature. Time to cure depends on film thickness, oven type, and how densely the board is populated; large, heavy, or crowded boards take longer because their greater thermal mass needs extra time to reach the target temperature. Consult the datasheet for specifics.
Does the coating meet industry standards?
Dow states Q1-4010 is UL, IPC, and MIL recognized, making it suitable for applications that call for those recognitions. Because listings and revisions can change, users needing formal qualification for a specific standard or program should confirm the current recognition status for their exact grade and application.
