DOWSIL™ 1-4105 Conformal Coating

Harmonization Code : 3910.00.00.90 | Silicones in Primary Forms; Others

DOWSIL™ 1-4105 Conformal Coating

Main features

  • One-part, solventless silicone conformal coating
  • Cures to a soft, low-stress elastomer
  • Wide operating temperature range (-45°C to 200°C)

Product Description

DOWSIL™ 1-4105 Conformal Coating is a one-part, transparent silicone conformal coating designed to provide reliable mechanical and environmental protection for printed circuit boards and electronic assemblies. This solventless, heat-curable material features a low viscosity formulation that enables excellent flow and coverage across densely populated boards and tight geometries. Upon curing, it forms a soft, low-stress elastomer that protects sensitive components from mechanical and thermal stress while maintaining long-term reliability.


DOWSIL 1-4105 supports rapid and controlled heat cure processing at relatively low temperatures and offers a long working life at room temperature. The coating includes a UV indicator for automated inspection and quality control, ensuring consistent application in high-volume manufacturing. It is compatible with no-clean and lead-free soldering processes and provides strong adhesion to a wide range of PCB substrates.

Product Key Features

  • One-part, solventless silicone conformal coating
  • Heat cure system for controlled and rapid processing
  • Low viscosity for enhanced flow and gap 
  • Cures to a soft, low-stress elastomer
  • UV indicator for inspection and process control
  • High dielectric strength and electrical insulation performance
  • Compatible with no-clean and lead-free soldering processes
  • Long pot life for extended usability in production
  • Wide operating temperature range (-45°C to 200°C)
  • UL94 V-1 flammability rating

Applications

  • Conformal coating for printed circuit board (PCB) assemblies
  • Protection for rigid and flexible circuit boards
  • High-density and fine-pitch electronic assemblies
  • Automotive electronics and control systems
  • Industrial automation and control equipment
  • Consumer electronics requiring low-stress protection
Product Family

DOWSIL 1-4105

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Color
The color
Clear
Specific Gravity
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.
0.97
Physical Properties
Viscosity
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
450 mPa.s
Mechanical Properties
Elongation
Elongation is the process of lengthening something. It is a percentage that measures the initial, unstressed, length compared to the length of the material right before it breaks. It is commonly referred to as Ultimate Elongation or Tensile Elongation at break.
70 %
Electrical Properties
Dielectric Strength
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.
20 kV/mm

Additional Information

Frequently Asked Questions About DOWSIL™ 1-4105 Conformal Coating

What are typical applications for DOWSIL™ 1-4105?


DOWSIL™ 1-4105 is used to protect printed circuit boards and assemblies where low-stress protection and reliable environmental performance are required, including:

  • Automotive electronics
  • Industrial control systems
  • Consumer electronics
  • High-density PCB assemblies

Why choose DOWSIL™ 1-4105?

This coating provides excellent stress relief for delicate components due to its soft elastomeric properties. Its low viscosity ensures complete coverage in complex assemblies, while the heat cure system enables fast and controlled processing in production environments.

What is the curing method?

DOWSIL™ 1-4105 cures באמצעות heat at relatively low temperatures. Typical curing conditions are around 10 minutes at 105°C, depending on board mass and configuration.

What application methods are supported?

The coating supports spray, brush, dip, flow, and automated selective coating processes, making it suitable for both manual and high-volume manufacturing.

What surface preparation is required?

All substrates should be clean, dry, and free from contaminants such as oils, dust, or flux residues to ensure optimal adhesion and coating performance.

Is the coating repairable?

Yes, the coating can be removed mechanically or with solvents for repair and rework. After repair, the area can be recoated to restore full protection.

Learn More About DOWSIL™ 1-4105


DOWSIL™ 1-4105 Conformal Coating is designed for high-reliability electronics requiring low-stress protection and efficient processing. This heat-cure silicone conformal coating provides excellent flow, electrical insulation, and durability while supporting scalable manufacturing processes.


Main Advantages of DOWSIL 1-4105

low viscosity

Enhances flow and penetration into narrow gaps and densely populated assemblies for complete coverage.

low stress elastomer

Cures to a soft, flexible material that minimizes mechanical stress on sensitive electronic components.

heat cure efficiency

Enables rapid and controlled curing at relatively low temperatures, improving manufacturing throughput.

inspection ready

Integrated UV indicator supports automated inspection and consistent quality control.

How to Choose a Conformal Coating

  • ✔ Environmental exposure
  • ✔ Mechanical protection needs
  • ✔ Processing requirements
  • ✔ Repairability
  • ✔ Application method
  • ✔ Operating temperature

Compliance You Can Trust ✅

  • UL746E Recognized
  • UL94 V-1 Flammability Rating
  • Designed for high-reliability electronics applications

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