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Description for Dow Dowsil 1-2577 Low VOC Conformal Coating
One-part, medium viscosity; ozone-safe, solvent-borne, elastoplastic silicone resin; excellent abrasion resistance; RTV or heat accelerable cure.Brand Dowsil Chemical Resistance Good Application Type Conformal Coating 1 Part or 2 Part 1-Part Material Form Liquid Industry Electronic Printed Wiring Board (PWB) applications, Smart Meters, E-Mobility Solutions, Smart Home Devices, Insulation, Headlamp assemblies, Flexible circuit boards, Rigid circuit boards, Electronic devices Manufacturer Dow Chemistry Silicone resin Cure Method RTV, Moisture, Heat Cure Temperature (°C) 25, 25, 25, 80, 60 Odor Details Much Lower Cure Time (min) 4,320, 10, 10, 10 Viscosity (cPs) Medium, 1,050 Color Transparent Ozone Resistance Ozone resistance High Temperature Resistance (°C) 200 Low Temperature Resistance (°C) -45 Volume Resistivity (O) 1.9e14 (ohms/cm) Key Specifications Mil-Spec (United States Military Standard): I-46058-C: Mil-I-46058C, Amendment 7 Approved, UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 94: UL94 V-0, IPC (Association Connecting Electronics Industries): IPC-CC-830 Amendment 1 Approved, UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 746E -
Technical Data for Dow Dowsil 1-2577 Low VOC 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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Industry
- Master Control Module
- Smart Meters
- Smart Home Devices
- E-Mobility Solutions
- Headlamp - Headlamp assemblies
- Electronics - Electronic Printed Wiring Board (PWB) applications, Flexible circuit boards, Rigid circuit boards, Electronic devices
- Insulation
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Chemistry
- Silicone - Silicone resin
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Application Method
- Dispenser - Robotic dispensing, Select coating
- Brush
- Spray
- Flow
- Dip
- Screen Print - Automated pattern coating
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Cure Method
- Moisture / Condensation Cure - Moisture
- Heat
- RTV (Room Temperature Vulcanization) - RTV
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Color
- Clear / Transparent - Transparent
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Key Specifications
- Mil-Spec (United States Military Standard) : I-46058-C : Amd. 7 - Mil-I-46058C, Amendment 7 Approved
- UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association) : UL 94 : V0 - UL94 V-0
- IPC (Association Connecting Electronics Industries) : CC-830 - IPC-CC-830 Amendment 1 Approved
- UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association) : 746E - UL 746E
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Brand
- Dowsil
Specifications
Cure Specs
Cure Temperature (°C) 25, 25, 25, 80, 60 Test Method Odor Details Much Lower Cure Time (min) 4,320, 10, 10, 10 Test Method Viscosity (cPs) Medium, 1,050 Work / Pot Time (min) >86,400 Test Method Bond Strength
General Bond Strength (psi) Good Material Resistance
Ozone Resistance Ozone resistance Abrasion Resistance Abrasion resistant UV Resistance UV resistance Environmental Resistance Environmental resistance High Temperature Resistance (°C) 200 Low Temperature Resistance (°C) -45 Conductivity
Dissipation Factor 0.00110, <0.00030 Test Method Dielectric Strength (V/mil) Durable Dielectric Constant 2.34, 2.33 Test Method Volume Resistivity (O) 1.9e14 (ohms/cm) Hardness
Shore A Hardness 85 Shore D Hardness 25 Flexibility Flexible Other Properties
Specific Gravity 0.880, 1.120 Test Method Flash Point (°F) 69.8 Business Information
Shelf Life Details The product should be used by its Use Before date as indicated on the product label. Shelf Life Temperature (°F) 77 Shelf Life Type From date of manufacture Shelf Life (mon) 36 -
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Best Practices for Dow Dowsil 1-2577 Low VOC Conformal Coating
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Curing
The time required to reach a tack-free state can be reduced with heat. When using heat for this purpose, allow adequate time for the solvent to evaporate prior to exposing to elevated temperatures in an air circulating oven. A typical cure schedule for 3 mil (75 micron) coatings is 10 minutes at room temperature, followed by 10 minutes at 60°C. If the coating blisters or contains bubbles, allow additional time at room temperature for the solvent to flash off prior to oven cure.
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Testing
If a substrate or material is questionable with respect to potentially causing inhibition of cure, it is recommended that a small scale compatibility test be run to ascertain suitability in a given application. The presence of liquid or uncured product at the interface between the questionable substrate and the cured gel indicates incompatibility and inhibition of cure.
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Comparable Materials for Dow Dowsil 1-2577 Low VOC Conformal Coating
Spec Engine® Results
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Cure Temperature Test Methods
Cure Temperature | Cure Time Test Method |
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25°C | Typical for a 5-mil thickness sample in 180° peel. |
25°C | |
25°C | A typical cure schedule for 3 mil (75 micron) |
80°C | A typical cure schedule for 3 mil (75 micron) |
60°C |
Cure Time Test Methods
Cure Time | Test Method |
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4,320 min | Typical for a 5-mil thickness sample in 180° peel. |
10 min | A typical cure schedule for 3 mil (75 micron) |
10 min | A typical cure schedule for 3 mil (75 micron) |
10 min |
Tack Free Time Test Methods
Tack Free Time | Tack Free Temperature | Test Method |
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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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2.34 | 100 Hz |
2.33 | 100 kHz |
Dissipation Factor Test Methods
Dissipation Factor | Test Method |
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0.00110 | 100 Hz |
<0.00030 | 100 kHz |
Specific Gravity Test Methods
Specific Gravity | Test Method |
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0.880 | Uncured |
1.120 | Cured |

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