Dow 3120 RTV Silicone Rubber w/ 1 Catalyst 5:1 Datasheet Dow 3120 RTV Silicone Rubber w/ 1 Catalyst 5:1

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  • Description for Dow 3120 RTV Silicone Rubber w/ 1 Catalyst 5:1

    Low tear strength, high durometer, excellent heat stability.

    *See Terms of Use Below

    Application Type Mold-Making, Pot, Encapsulate
    1 Part or 2 Part 2-Part
    Material Form Liquid
    Substrate Aluminum foil, Metal, Paper, Plastic, Polyesters
    Industry Electrical, Printed circuit boards, Transformers, Coils, Electronic
    Manufacturer Dow
    Chemistry Silicone rubber surfaces
    Cure Method Base/Catalyst
    Cure Temperature (°C) 20 to 25
    Cure Time (min) 360
    Viscosity (cPs) 28,000, Pourable
    Color Red
    High Temperature Resistance (°C) 300
    Low Temperature Resistance (°C) -55
    Other Resistance Radiation
    Volume Resistivity (O) 2.7e13 (ohms/cm)
    Key Specifications Mil-Spec (United States Military Standard): MIL-S-23586

  • Technical Data for Dow 3120 RTV Silicone Rubber w/ 1 Catalyst 5:1

    *See Terms of Use Below

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 2-Part
    • Material Form
      • Liquid
    • Substrate
    • Industry
      • Electronics - Electrical, Electronic
      • Printed Circuit Board (PCB) - Printed circuit boards
      • Transformers
      • Coils
    • Chemistry
    • Application Method
      • Dip
    • Cure Method
      • 2-Part Cure - Base/Catalyst
    • Color
      • Red
    • Key Specifications
      • Mil-Spec (United States Military Standard) : S-23586 - MIL-S-23586
    Specifications
    Cure Specs
    Cure Temperature (°C) 20 to 25
    Cure Time (min) 360
    Viscosity (cPs) 28,000, Pourable Test Method
    Work / Pot Time (min) 30
    Mix Ratio 5:1 (by volume), 5:1 (by weight)
    Bond Strength
    Tear Strength (piw) 40, Low
    Tensile Strength (psi) 900 Test Method
    Material Resistance
    Non-Corrosive Corrosion
    High Temperature Resistance (°C) 300
    Low Temperature Resistance (°C) -55
    Other Resistance Radiation
    Conductivity
    Dissipation Factor 0.07000, 0.01700 Test Method
    Dielectric Strength (V/mil) Good, 457 Test Method
    Dielectric Constant 4.19, 3.54 Test Method
    Thermal Conductivity (W/m°K) 0.31 Test Method
    Volume Resistivity (O) 2.7e13 (ohms/cm) Test Method
    Hardness
    Shore A Hardness 60 Test Method
    Elongation (%) 1 Test Method
    Flexibility Firm,Flexible
    Other Properties
    Specific Gravity 1.450 Test Method
    Flash Point (°F) 212.0
    Business Information
    Shelf Life Details Dow Corning 3110, 3112, and 3120 RTV Rubber bases and Dow Corning RTV Catalysts should be stored in closed containers. The shelf life of the bases and catalysts S, and 4 is 24 months from date of manufacture when stored in original, unopened containers at 23°C (73°F). The shelf life of F catalyst and 1 catalyst is 12 months from date of manufacture under the same storage conditions. In all cases, rubbers should be stored at temperatures below 32°C (90°F).;Shelf life information is subject to change. Refer to the Sales Specification for current shelf life information.
    Shelf Life Temperature (°F) 73
    Shelf Life Type from date of manufacture
    Shelf Life (mon) 24

  • Best Practices for Dow 3120 RTV Silicone Rubber w/ 1 Catalyst 5:1

    *See Terms of Use Below

    1. Surface Preparation

      To ensure maximum reliability and complete environmental protection, the following procedure should be followed: Clean assembly of all contaminants such as oil, grease, solder flux, moisture and dirt.

      For strong adhesion, dip, spray or brush surfaces with Dow Corning ® 1201 RTV Primer and allow to cure at least 30 minutes. Silicone rubber surfaces should not be primed, but should be abraded and cleaned.

    2. Application

      In potting with Dow Corning RTV Rubbers, the part or assembly to be packaged is placed in a form with clearance at all points when sealing is necessary. This form may be made of paper, aluminum foil, metal or plastic. A release agent may be used to aid in demolding. Where printed circuit boards and similar assemblies are to be dip coated, select the viscosity grade that will give the desired coating thickness. To apply Dow Corning RTV Rubbers as conformal coatings, immerse parts in the catalyzed compound, withdraw them slowly, pausing just before the part leaves the dip tank to minimize stringing, and hang on a rack to cure. Allow one to two hours between dips. Two dips in a low-viscosity-grade encapsulant are suggested for optimum protection. For maximum assurance of void-free potting, pour the silicone RTV rubber, then apply a vacuum of more than 28 inches of mercury to facilitate the removal of air.

    3. Mixing

      Dow Corning 3110 RTV Rubber base should be stirred before using, since filler separation may occur upon prolonged standing. Catalysts can be added to the base material in its shipping container or any clean, dry container. If vacuum deairing is planned, the container should be no more than one-half full to allow for the expansion during the vacuum cycle. Either hand mixing or mechanical mixing is satisfactory. With either method, care should be taken not to whip large amounts of air into the mixture. Avoid vigorous mechanical mixing since sufficient frictional heat may be generated to accelerate the cure rate.

    4. Deairing/Degassing

      Vacuum deairing may not be necessary, particularly with Dow Corning 3110 RTV Rubber. When it is necessary, it should be done first in the mixing container. A vacuum of at least 28 inches of mercury should be held until most bubbling has ceased. For best results, the mixture should be vacuum deaired again after it has been poured in place, especially when densely packed circuit components are being potted. For impregnation of units such as coils or transformers, the vacuum cycle can be followed by the application of 10 to 50 psi air pressure.

    5. Curing

      Curing rate is a function of temperature and humidity. Curing time will increase at temperatures below 23°C (73°F). Although the RTV Rubbers are formulated to cure in dry atmospheres, exposure to high humidity will tend to decrease curing time.

      Dow Corning 3110, 3112, and 3120 RTV Rubbers may depolymerize when overheated in total confinement. To minimize this effect, pottings which must operate in total confinement at elevated temperatures must be given a graduated post cure which allows volatiles to escape. During the graduated post cure, the temperature should be increased approximately 25°C per hour depending upon thickness of potted section. A final bake of two to four hours at a temperature 50°C degrees above the maximum operating temperature of the device is recommended.

  • Comparable Materials for Dow 3120 RTV Silicone Rubber w/ 1 Catalyst 5:1

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Viscosity Test Methods
Viscosity Test Method Temperature
28,000 cPs ASTM D 1084B 25°C
Pourable
Tensile Strength Test Methods
Tensile Strength Test Method
900 psi ASTM D 412
Dielectric Constant Test Methods
Dielectric Constant Temperature Test Method
4.19 25°C Dielectric constant, 100 Hz, ASTM D 150, Using Dow Corning RTV Catalyst F or S at 10:1 base to catalyst ratio. Wide departures from normal 10:1 ratio may slightly alter physical properties such as hardness and elongation
3.54 25°C Dielectric constant, 100 KHz, ASTM D 150, Using Dow Corning RTV Catalyst F or S at 10:1 base to catalyst ratio. Wide departures from normal 10:1 ratio may slightly alter physical properties such as hardness and elongation
Dielectric Strength Test Methods
Dielectric Strength Test Method
Good Dielectric Strength Test Method
457 V/mil ASTM D 149, Using Dow Corning RTV Catalyst F or S at 10:1 base to catalyst ratio. Wide departures from normal 10:1 ratio may slightly alter physical properties such as hardness and elongation., 1/16” sample
Dissipation Factor Test Methods
Dissipation Factor Temperature Test Method
0.07000 25°C Dissipation factor, 100 Hz, ASTM D 150, Using Dow Corning RTV Catalyst F or S at 10:1 base to catalyst ratio. Wide departures from normal 10:1 ratio may slightly alter physical properties such as hardness and elongation.
0.01700 25°C Dissipation factor, 100 KHz, ASTM D 150, Using Dow Corning RTV Catalyst F or S at 10:1 base to catalyst ratio. Wide departures from normal 10:1 ratio may slightly alter physical properties such as hardness and elongation.
Thermal Conductivity Test Methods
Thermal Conductivity Temperature Test Method
0.31 W/m°K 25 to 100°C ASTM D 2214
Volume Resistivity Test Methods
Volume Resistivity Test Method
2.7e13 (ohms/cm) ASTM D 257, Using Dow Corning RTV Catalyst F or S at 10:1 base to catalyst ratio. Wide departures from normal 10:1 ratio may slightly alter physical properties such as hardness and elongation.
Elongation Test Methods
Elongation Test Method
1 % ASTM D 412
Shore A Hardness Test Methods
Shore A Hardness Shore Hardness Test Method
60 ASTM D 2240
Specific Gravity Test Methods
Specific Gravity Temperature Test Method
1.450 25°C ASTM D 792A