Product Information Electronics - polymer-g.com

1 Product Information Electronics Dow Corning 1-2577 Conformal Coating FEATURES & BENEFITS One-part, translucent medium viscosity conformal coating with Cures to a tough, elastoplastic, firm, abrasion resistant surface after cure resilient, abrasion resistant surface Solvent-borne resin coating APPLICATIONS. Room temperature cure, no ovens Dow Corning 1-2577 Conformal Coating is suitable for protective coating for required rigid and flexible circuit boards and for electronic Printed Wiring Board (PWB). Optional mild heat acceleration applications, particularly those requiring toughness and abrasion resistance. (after solvent flash-off) can speed in-line processing TYPICAL PROPERTIES.

2 UV indicator allows for automated Specification Writers: These values are not intended for use in preparing inspection specifications. Please contact your local Dow Corning sales office or your Global UL 94 V-0 flammability rating Dow Corning Connection before writing specifications on this Product . UL 746E Recognized IPC-CC-830, Amendment 1 Property Unit Result Approved One or Two-part - One Mil-I-46058C, Amendment 7. Approved Color (Cured) - Translucent (Clear). Good adhesion allows use with Viscosity cP 950. many low-solids (no clean) and mPa-sec 950. no-lead solders Pa-sec 1. COMPOSITION Specific Gravity (Uncured) - One part silicone resin solution Specific Gravity (Cured) - Tack-Free Time at 25 C minutes 7.

3 Tack-Free Time at 60 C/15% RH minutes Durometer Shore A - 80. Dielectric Strength volts/mil 400. kV/mm 16. Volume Resistivity ohm*cm 5E+13. Dielectric Constant at 100 Hz - Dielectric Constant at 100 kHz - Dissipation Factor at 100 Hz - Dissipation Factor at 100 kHz - < Agency Listing - IPC-CC-830, Amend. 1. UL746E. UL Flammability Classification NA 94 V-0. Mil Specification NA MIL-I-46058C, Amend. 7. NVC - Forced Draft Volatility % DESCRIPTION is recommended that the coatings be the solvent and how long the container Dow Corning brand RTV conformal applied to clean and dry substrates has been sitting in storage. The coatings have firm, dry surfaces for prior to application.

4 On certain coating should cure to a clear better handling and abrasion resistance difficult, low-surface energy surfaces, consistency regardless of this initial after cure. Various viscosity versions adhesion may be improved by priming appearance. Mild agitation can facilitate different application or by special surface treatment such as reconstitute the material so it is methods. They require atmospheric chemical or plasma etching. consistent in appearance and viscosity. moisture to cure (no ovens) and their Care should be taken if the Low VOC. cure rates can be accelerated by mild HANDLING versions are in bladder bags.

5 A gentle heat. They are supplied in solvent, PRECAUTIONS rolling of the pail should correct the with low-VOC versions available and problem and redistribute the solvent. Product SAFETY. have Mil spec, IPC-CC-830 and UL This should be performed 24 hours Information REQUIRED FOR. recognition. Conformal coatings are before use, so any induced bubbles SAFE USE IS NOT INCLUDED IN. materials applied in thin layers onto from the manual agitation or rolling THIS DOCUMENT. BEFORE. printed circuits or other electronic process have a chance to dissipate. HANDLING, READ Product . substrates. AND SAFETY DATA SHEETS. AND CONTAINER LABELS FOR USEFUL TEMPERATURE.

6 APPLICATION METHODS SAFE USE, PHYSICAL AND RANGES. Spray HEALTH HAZARD For most uses, silicone adhesives Brush Information . THE SAFETY should be operational over a Flow DATA SHEET IS AVAILABLE ON temperature range of -45 to 200 C. Dip THE DOW CORNING WEBSITE (-49 to 392 F) for long periods of Automated pattern coating AT , OR time. However, at both the low and FROM YOUR DOW CORNING high temperature ends of the SALES APPLICATION spectrum, behavior of the materials PROCESSING/CURING ENGINEER, OR DISTRIBUTOR, and performance in particular The time required to reach a tack-free OR BY CALLING applications can become more state can be reduced with heat.

7 When DOW CORNING CUSTOMER complex and require additional using heat for this purpose, allow SERVICE. considerations. For low-temperature adequate time for the solvent to performance, thermal cycling to evaporate prior to exposing to elevated USABLE LIFE AND conditions such as -55 C (-67 F) may temperatures in an air circulating STORAGE be possible but performance should be oven. A typical cure schedule for 3. verified for your parts or assemblies. mil (75 micron) coatings is 10 minutes Special precautions must be taken to Factors that may influence at room temperature, followed by 10 prevent moisture from contacting performance are configuration and minutes at 60 C.

8 If the coating blisters Dow Corning RTV conformal stress sensitivity of components, or contains bubbles, allow additional coatings. Containers should be kept cooling rates and hold times, and prior time at room temperature for the tightly closed and head or air space temperature history. At the high- solvent to flash off prior to oven cure. minimized. Partially filled containers temperature end, the durability of the should be purged with dry air or other cured silicone elastomer is time and POT LIFE AND CURE gases, such as nitrogen. The Product temperature dependent. As expected, should be stored in its original RATE packaging with the cover tightly the higher the temperature, the shorter The pot life of Dow Corning RTV the time the material will remain attached to avoid any contamination.

9 Conformal coatings is dependent on useable. Store in accordance with any special the application method chosen. To instructions listed on the Product label. extend pot life, minimize exposure to REPAIRABILITY. The Product should be used by its moisture by using dry air or dry In the manufacture of electronic Use Before date as indicated on the nitrogen blanketing whenever devices, it is often desirable to salvage Product label. possible. or reclaim damaged or defective units. In some cases depending on storage, Dow Corning RTV conformal ADHESION there may be a hazy appearance coatings offer excellent reparability With RTV cure coatings, adhesion noticed in the containers when first because they can be removed from typically lags behind cure and may opened, even though they are substrates and circuitry by scraping or take up to 72 hours to build in some considered clear conformal coatings.

10 It cutting, or by using solvents or coatings. Dow Corning RTV is normal for this to occur especially if stripping agents. If only one circuit conformal coatings are formulated to the container has been sitting stagnant component is to be replaced, a provide adhesion to most common for several days or weeks. This is due soldering iron may be applied directly electronic substrates and materials. It to the solubility of the phenyl resin in through the coating to remove the Dow Corning is a registered trademark of Dow Corning Corporation. The Corning portion of the Dow Corning trademark is a trademark of Corning, Incorporated, used under license.