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Description for Dow Dowsil HC 1000 Gray Conformal Coating
One part, gray, fast tack free solventless conformal coating with controlled volatility, high viscosity and good flame resistance, Controlled volatility, High viscosity, Cures to soft, low stress elastomerBrand Dowsil Chemical Resistance Good Application Type Conformal Coating 1 Part or 2 Part 1-Part Material Form Liquid Industry Sensors, PCB system assemblies, Connectors, Smart Meters, E-Mobility Solutions, Smart Home Devices, Electronic components, PCB system appliances , Flexible circuit boards, Printed circuits substrates, Relays, Rigid circuit boards, Printed wiring board assemblies, Most delicate components, Interconnections Manufacturer Dow Chemistry Polydimethylsiloxane, Solventless Application Method Flow: Flow coating Cure Method RTV, Atmospheric moisture , Mild heat, Room Temperature cure Cure Temperature (°C) 20 to 25 Room Temperature Cure Time (min) 30 Viscosity (cPs) High, 12,000, Controlled volatility Color Gray, Translucent Ozone Resistance Ozone resistance High Temperature Resistance (°C) 200 Low Temperature Resistance (°C) -45, -55 Volume Resistivity (O) 2.0 E15 (ohm-cm) Stress Relief Low stress Elastomeric Elastomer Key Specifications UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 94: UL 94 V-0 flammability rating -
Technical Data for Dow Dowsil HC 1000 Gray Conformal Coating
Overview
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Chemical Resistance
- Chemical Resistance - Good
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Application Type
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1 Part or 2 Part
- 1-Part
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Material Form
- Liquid
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Substrate
- Other - Other substrates
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Industry
- Smart Meters
- Smart Home Devices
- E-Mobility Solutions
- Electronics - Electronic components, Flexible circuit boards, Relays, Rigid circuit boards, Printed wiring board assemblies, Most delicate components, Interconnections
- Sensors
- Printed Circuit Board (PCB) - PCB system appliances , PCB system assemblies, Printed circuits substrates
- Connectors
- Appliances
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Chemistry
- Solvent-Free - Solventless
- Silicone - Polydimethylsiloxane
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Application Method
- Dispenser - Robotic dispensing, Syringe dispensed, Select coating
- Brush
- Spray
- Flow : Flow Coat - Flow coating
- Dip
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Cure Method
- Room Temperature / Air Dry - Room Temperature cure
- Moisture / Condensation Cure - Atmospheric moisture
- Heat - Mild heat
- RTV (Room Temperature Vulcanization) - RTV
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Color
- Translucent
- Gray
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Key Specifications
- UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association) : UL 94 : V0 - UL 94 V-0 flammability rating
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Brand
- Dowsil
Specifications
Cure Specs
Cure Temperature (°C) 20 to 25 Room Temperature Test Method Cure Time (min) 30 Test Method Viscosity (cPs) High, 12,000, Controlled volatility Tack Free Time (min) Fast, 11 Test Method Work / Pot Time (min) >86,400 Test Method Bond Strength
General Bond Strength (psi) Good adhesion Material Resistance
Flame Resistance Good Ozone Resistance Ozone resistance UV Resistance UV resistance Environmental Resistance Protection from harsh operating environments High Temperature Resistance (°C) 200 Low Temperature Resistance (°C) -45, -55 Moisture/Humidity Resistance Protection from moisture Vibration Resistance/Shock Resistance Protection from vibration Conductivity
Dissipation Factor 0.00300 Test Method Dielectric Strength (V/mil) Dielectric insulation, 525 Test Method Dielectric Constant 3.20 Test Method Volume Resistivity (O) 2.0 E15 (ohm-cm) Test Method Hardness
Stress Relief Low stress Shore A Hardness 24 Test Method Elastomeric Elastomer Flexibility Soft Other Properties
Specific Gravity 1.070 Business Information
Shelf Life Details Storage conditions and shelf life (“Use by” date) are indicated on the product label. Shelf Life Type From date of manufacture Shelf Life (mon) 12 -
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Best Practices for Dow Dowsil HC 1000 Gray Conformal Coating
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Surface Preparation
It is recommended that the coatings be applied to clean and dry substrates prior to application. On certain difficult, low-surface energy surfaces, adhesion may be improved by priming or by special surface treatment such as chemical or plasma etching.
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Curing
Time to cure is dependent on several variables including the method of application, film thickness, temperature and humidity. Tack-free time in the data table gives an indication of typical times until surface is dry enough to handle. Cure time for full cure are indications of time needed to develop full physical properties such as durometer, tensile strength or adhesion. These times, including full cure time, can be significantly improved by introducing mild heat of 60°C or less.
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Comparable Materials for Dow Dowsil HC 1000 Gray Conformal Coating
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Cure Temperature Test Methods
Cure Temperature | Cure Time Test Method |
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20 to 25°C Room Temperature | Typical for a 5-mil thickness sample in 180° peel., 1.0 mm thickness, 20°C, 55% RH. |
Cure Time Test Methods
Cure Time | Test Method |
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30 min | Typical for a 5-mil thickness sample in 180° peel., 1.0 mm thickness, 20°C, 55% RH. |
Tack Free Time Test Methods
Tack Free Time | Tack Free Temperature |
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Fast | 20 to 25°C Room Temperature |
11 min | 25°C Room Temperature |
Work / Pot Time Test Methods
Work / Pot Time | Temperature |
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>86,400 min | <29°C |
Dielectric Constant Test Methods
Dielectric Constant | Test Method |
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3.20 | 1 MHz |
Dielectric Strength Test Methods
Dielectric Strength | Test Method |
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Dielectric insulation | |
525 V/mil | JIS K 6249 |
Dissipation Factor Test Methods
Dissipation Factor | Test Method |
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0.00300 | 1 MHz, JIS K 6249 |
Volume Resistivity Test Methods
Volume Resistivity | Test Method |
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2.0 E15 (ohm-cm) | JIS K 6249 |
Shore A Hardness Test Methods
Shore A Hardness | Shore Hardness Test Method |
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24 | Durometer |

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