Specialty Materials for Electronic Assembly
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Item # 1-2620 RTV Coating, Silicone Dow Electronics Conformal Coatings


Silicone Dow® Electronics Conformal Coatings

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1-part, transparent, low-viscosity conformal coating with firm, abrasion resistant surface after cure




Specifications  · Features  · Potential Uses  · Application Methods  · Cure

Specifications

Type
RTV Elastoplastic Conformal Coatings

Product Form
1-part RTV cure

Color
Translucent

Viscosity
150 mPa/s

Durometer
25 D

Specific Gravity
1.007

Room Temperature Tack-Free Time
5 min

Room Temperature Cure Time
60 min

Heat Cure Time
2 min at 60 ºC/15 % RH

Flammability Classification
94 V-0

UL 746E Approval
Yes

Shelf Life from Date of Manufacture
36 months

Military Specification
MIL-I-46058C, Amend. 7

Type, Class, Group
Type SR, QPL

Dielectric Strength
550 V/mil
22 kV/mm

Dielectric Constant at 100 Hz
2.69

Dielectric Constant at 100 kHz
2.68

Dissipation Factor at 100 Hz
0.002

Dissipation Factor at 100 kHz
0.0003

Volume Resistivity
4.6E+13 O/cm


Features

Cures to tough, resilient, abrasion-resistant surface; solvent-borne resin coating; room-temperature cure with optional heat acceleration after solvent flash-off; UV indicator for inspection; UL V-0 flammability rating; Mil Spec 46058C tested


Potential Uses

Protective coating for rigid and flexible circuit boards. These one-part, self-priming coatings cure to flexible, transparent elastoplastic coatings ideally suited for electronic printed wiring board (PWB) applications, particularly those requiring toughness and abrasion resistance.


Application Methods

Applied by spray, brush, flow, dip or automated pattern coating. For spraying operations, solvent dilution of up to 60 % is recommended. For dip coating operations, material may be used as supplied or solvent diluted if a thinner film build is desired. Care should be taken to ensure the solvent is free from moisture and dip tanks should be covered when not in use. For dilution of low VOC coatings, Dow OS-20 Fluid is recommended.


Cure

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 80 °C. If the coating blisters or contains bubbles, allow additional time at room temperature for the solvent to flash off prior to oven cure.