DOWSIL Q1-4010 CONFORMAL COATING
Harmonization Code : 3208.20.90 | Paints and varnishes that are dispersed or dissolved in a non aqueous medium
Main features
- One-Part, Solventless Silicone Coating
- Multiple Supported Application Methods
- UV-Aided Coating Inspection
Product Description
DOWSIL™ Q1-4010 Conformal Coating is a one-part, transparent silicone conformal coating for protecting rigid and flexible circuit boards, printed wiring boards, and assemblies containing sensitive components or fine-pitch designs. The medium-viscosity, solventless material can be applied by dip, spray, brush, flow, or automated pattern coating and uses temperature-controlled heat curing for rapid processing. After cure, it forms a soft, low-stress elastomer with electrical insulation properties. A built-in UV indicator supports visual or automated inspection of coating coverage. The product is listed to IPC-CC-830B and UL 746E, classified UL 94 V-1, and tested to MIL-I-46058C Amendment 7.
Key features
- Rapid heat cure: Typical cure time is 10 minutes after the coating reaches 100°C, with actual time dependent on film thickness, oven type, and board thermal mass.
- Soft silicone protection: Cures to a 33 Shore A, low-stress elastomer with a typical dielectric strength of 23 kV/mm.
- Inspection and qualification support: Contains a UV indicator and carries IPC-CC-830B, UL 746E, UL 94 V-1, and MIL-I-46058C Amendment 7 credentials.
Applications / Suitable for
- Rigid and flexible circuit boards
- Printed wiring boards
- Boards with sensitive components and fine-pitch designs
TDS, SDS & Technical Documents
Technical Specifications
Physical Properties
Viscosity
825 mPa.s
Viscosity is a measurement of a fluid’s resistance to flow.
Viscosity is commonly measured in centiPoise (cP). One cP is defined as
the viscosity of water and all other viscosities are derived from this base. MPa is another common unit with a 1:1 conversion to cP.
A product like honey would have a much higher viscosity -around 10,000 cPs-
compared to water. As a result, honey would flow much slower out of a tipped glass than
water would.
The viscosity of a material can be decreased with an increase in temperature in
order to better suit an application
General Properties
Specific Gravity
1
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume.
For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
Electrical Properties
Dielectric Strength
23 kV/mm
Dielectric strength is measured in kV per mm and is calculated by the Breakdown voltage divided by the thickness of the tested material.
Those two properties go hand in hand and while Breakdown voltage is always thickness dependent, dielectric strength is a general material property.
As an example, the dielectric strength of Polyimide is 236 kV/mm. If we place 1mm of Polyimide between two electrodes, it will act as an insulator until the voltage between the electrodes reaches 236 kV. At this point it will start acting as a good conductor, causing sparks, potential punctures and current flow.
Volume Resistivity
2.11 E14 Ohms⋅cm
Volume resistivity, also called volume resistance, bulk resistance or bulk resistivity is a thickness dependent measurement of the resistivity of a material perpendicular to the plane of the surface.
Thermal Properties
UL 94 Rating
V-1
Flammability rating classification.
It determines how fast a material burns or extinguishes once it is ignited.
HB: slow burning on a horizontal specimen; burning rate less than 76 mm/min for thickness less than 3 mm or burning stops before 100 mm
V-2: burning stops within 30 seconds on a vertical specimen; drips of flaming particles are allowed.
V-1: burning stops within 30 seconds on a vertical specimen; drips of particles allowed as long as they are not inflamed.
V-0: burning stops within 10 seconds on a vertical specimen; drips of particles allowed as long as they are not inflamed.
5VB: burning stops within 60 seconds on a vertical specimen; no drips allowed; plaque specimens may develop a hole.
5VA: burning stops within 60 seconds on a vertical specimen; no drips allowed; plaque specimens may not develop a hole
Additional Information
Technical properties
As-supplied / before-processing properties
Typical as-supplied properties; values are not intended for use in preparing specifications.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Product form | One-part liquid | — | As supplied |
| Color | Transparent | — | As supplied |
| Viscosity | 825 | mPa·s | Typical value; equivalent to 825 cP |
| Non-volatile content | 99 | % | Typical property |
| Shelf life | 12 | months | Stored at 5°C; observe the product-label use-before date |
Technical properties
After-processing / final-state properties
Typical cured-material properties; values are not intended for use in preparing specifications.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Heat-cure time | 10 | minutes | After the coating reaches 100°C; film thickness, oven type, and board thermal mass affect actual time |
| Specific gravity | 1.00 | — | Cured material |
| Hardness | 33 | Shore A | Cured material |
| Unprimed lap-shear adhesion | 130 / 0.9 / 9 | psi / MPa / kg/cm² | Aluminum substrate; unprimed lap-shear test |
| Dielectric strength | 575 / 23 | V/mil / kV/mm | Typical cured-material property; not a working-voltage rating |
| Volume resistivity | 2.11 × 1014 | Ω·cm | Typical cured-material property |
| Dielectric constant | 2.85 / 2.63 | — | At 100 Hz / 100 kHz, respectively |
| Dissipation factor | 0.00271 / 0.0003 | — | At 100 Hz / 100 kHz, respectively |
