Dow 93-076-2 Aerospace Sealant Datasheet Dow 93-076-2 Aerospace Sealant

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  • Description for Dow 93-076-2 Aerospace Sealant

    Good tensile strength, bond strength, char characteristics, resistance to weathering, moisture and ozone; low thermal conductivity.

    Note: This material has been discontinued. Please view the Manufacturer's Recommended Replacement tab or call us at (262) 293-7970 for additional help.

    *See Terms of Use Below

    Application Type Bond, Coat, Seal
    1 Part or 2 Part 2-Part
    Material Form Paste, Silicone elastomer
    Substrate Aluminum , Glass, Metals, Plastics, Polyester, Cork, Stainless Steel, Titanium, Phenolic, Cured silicone rubber, Epoxy, Silicone resin laminates
    Industry Aerospace, Cable breakouts, Aircraft
    Manufacturer Dow
    Chemistry Silicone elastomer
    Cure Method Base/Catalyst
    Cure Temperature (°C) 20 to 25, 25, 85, 95
    Cure Time (min) 1,440, 240, 120
    Color Blue
    Ozone Resistance Good ozone resistance
    High Temperature Resistance (°C) 260
    Low Temperature Resistance (°C) -65, -68
    Volume Resistivity (O) 1e13 (ohms/cm)
    Density (g/cm³) 0.001

  • Technical Data for Dow 93-076-2 Aerospace Sealant

    *See Terms of Use Below

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 2-Part
    • Material Form
      • Elastomer - Silicone elastomer
      • Paste
    • Substrate
    • Industry
      • Aerospace
      • Aircraft
      • Industrial - Fabricating formed-in-placeseals, Terminations
      • Cable - Cable breakouts
    • Chemistry
    • Cure Method
      • 2-Part Cure - Base/Catalyst
    • Color
      • Blue
    Specifications
    Cure Specs
    Cure Temperature (°C) 20 to 25, 25, 85, 95
    Cure Time (min) 1,440, 240, 120
    Set Time (min) 1,440
    Tack Free Time (min) 240, 840 Test Method
    Work / Pot Time (min) 30, 120 Test Method
    Thixotropic Thixotropic
    Mix Ratio 10:1 (by volume), 10:1 (by weight)
    Bond Strength
    General Bond Strength (psi) High
    Peel Strength (piw) 12 (kN/m) Test Method
    Shear Strength (psi) 2.3 (Mpa) Test Method
    Tear Strength (piw) 25 (kN/m) Test Method
    Tensile Strength (psi) Good, 5.2 (Mpa) Test Method
    Material Resistance
    Ozone Resistance Good ozone resistance
    Environmental Resistance Good
    High Temperature Resistance (°C) 260
    Low Temperature Resistance (°C) -65, -68
    Moisture/Humidity Resistance Good
    Conductivity
    Dissipation Factor 0.01 (100 Hz), 0.01 (100 kHz) Test Method
    Dielectric Strength (V/mil) 16,000,000 Test Method
    Thermal Conductivity (W/m°K) Low
    Volume Resistivity (O) 1e13 (ohms/cm)
    Hardness
    Shore A Hardness 46 Test Method
    Elongation (%) 4 Test Method
    Other Properties
    Density (g/cm³) 0.001 Test Method
    Business Information
    Shelf Life Details When stored at or below 32°C in the original unopened containers, DOW CORNING 93-076 Aerospace Sealant has a usable life of 9 months from the date of production. After catalyst addition, the sealant will remain useable for about 2 weeks if stored immediately at -40°C or below. Since the catalyst is extremely sensitive to moisture, the container should be covered at all times. Also, container should be avoided. If catalyst becomes grainy or crystalline, it should not be used.frequent opening of the catalyst
    Shelf Life Type From date of production
    Shelf Life (mon) 9

  • Best Practices for Dow 93-076-2 Aerospace Sealant

    *See Terms of Use Below

    1. Surface Preparation

      DOW CORNING 93-076 Aerospace Sealant adheres well to primed surfaces of most materials used in the aerospace and aircraft industries. Typical materials include glass, cured silicone rubber, cork, phenolic, polyester, epoxy, silicone resin laminates and most metals including stainless steel, titanium and aluminum. It may not adhere well to polyethylene or certain plastics and organic materials (including rubber), which bleed or exude plasticisers. Stronger and more uniform bonds are obtained by preparing metal and plastic surfaces with DOW CORNING® 1204 Primer. For best results: Clean the surface with a chlorinated solvent (see Handling Precautions) and a slightly abrasive pad or a coarse lint-free cloth.

      Rinse cleaned surface with acetone or methyl ethyl ketone.

      Apply a thin coat of primer by dipping, brushing or spraying.

      Allow the primer to dry for at least 1 hour, according to relative humidity.

      Silicone rubber surfaces should not normally be primed, but only roughened slightly with abrasive paper and rinsed with acetone.

    2. Mixing

      The catalyst is added in a ratio of 10 parts of base to 1 part catalyst by weight. For best results the base should be thoroughly de-aired in standard vacuum equipment for 2 hours at greater than 650mm of mercury vacuum. The catalyst may then be added to the base in an air free mixer, such as a Semco® Pressure Mixer, model S-1350 or S-1378. Hand mixing may also be used if, after mixing, the product is de-aired in vacuum for about 30 minutes.

    3. Curing

      DOW CORNING 93-076 Aerospace Sealant is specially compounded to assure deep section curing. Like all tin-catalysed silicone rubbers, DOW CORNING 93-076 Aerospace Sealant may depolymerise in thick section when overheated in total confinement. To minimise this effect, encapsulations which must operate for extended periods in total confinement at elevated temperatures must be given a graduated post cure to allow volatiles to escape. During the graduated post cure, the temperature should be increased approximately 25°C per hour, depending upon the thickness of the potted sections. A final bake of 4 hours at 50°C above the maximum operating temperature of the device is recommended. To eliminate all the possibilities of depolymerisation, contact Dow Corning for alternate product recommendations.

  • Manufacturer's Recommended Replacement Materials

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Tack Free Time Test Methods
Tack Free Time Test Method
240 min CTM 0095, 1/2 hour catalyst
840 min CTM 0095, 2 hour catalyst
Work / Pot Time Test Methods
Work / Pot Time Test Method
30 min CTM 0092A, 1/2 hour catalyst, Length of time that at least 15 grams per minute of sealant can be extruded through a 3mm orifice of a standard 6 oz sealant cartridge under 6.3 MPa pressure.
120 min CTM 0092A, 2 hour catalyst, Length of time that at least 15 grams per minute of sealant can be extruded through a 3mm orifice of a standard 6 oz sealant cartridge under 6.3 MPa pressure.
Peel Strength Test Methods
Peel Strength Substrate Test Method
12 (kN/m) 1.5mm glue, 6mm cold rolled steel CTM 0293
Tear Strength Test Methods
Tear Strength Test Method
25 (kN/m) CTM 0159A, ASTM D624, Die B
Tensile Strength Test Methods
Tensile Strength Test Method
Good
5.2 (Mpa) CTM 0137A, ASTM D412
Shear Strength Test Methods
Shear Strength Type Substrate Test Method
2.3 (Mpa) Lap shear strength Aluminum CTM 0293, For good adhesion, all substrates except silicone rubber, should be primed with DOW CORNING® 1204 primer. All bond strengths measured on ASTM-D-2024-T3 aluminium.
Dielectric Strength Test Methods
Dielectric Strength Test Method
16,000,000 V/mil Dielectric Strength Test Method
Dissipation Factor Test Methods
Dissipation Factor Test Method
0.01 (100 Hz) CTM 0112, ASTM D150
0.01 (100 kHz) CTM 0112, ASTM D150
Elongation Test Methods
Elongation Test Method
4 % CTM 0137A
Shore A Hardness Test Methods
Shore A Hardness Shore Hardness Test Method
46 CTM 0099, ASTM D2240
Density Test Methods
Density Temperature Test Method
0.001 g/cm³ 25°C CTM 0022