Application Type Bond, Coat, Sealant 1 Part or 2 Part 2 Part Material Form Paste, Silicone elastomer Substrate Epoxy, Phenolic, Glass, Aluminum, Metals, Titanium, Plastics, Polyester, Cured silicone rubber, Stainless Steel, Silicone resin laminates Industry Cable breakouts, Aerospace, 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 Beige, Beige Ozone Resistance Good ozone resistance High Temperature Resistance (°C) 260 Low Temperature Resistance (°C) -65, -68 Density (g/cm³) 0.001
Technical Data for Dow 93-076-1/2 Aerospace Sealant
1 Part or 2 Part
- 1 Part or 2 Part - 2 Part
- Elastomer - Silicone elastomer
- Silicone - Silicone elastomer
- 2-Part Cure - Base/Catalyst
- Brown - Beige
- Off-White - Beige
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)
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
Ozone Resistance Good ozone resistance Environmental Resistance Good, Weathering High Temperature Resistance (°C) 260 Low Temperature Resistance (°C) -65, -68 Moisture/Humidity Resistance Good
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)
Shore A Hardness 46 Test Method Elongation (%) 4 Test Method
Density (g/cm³) 0.001 Test Method
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 93-076-1/2 Aerospace Sealant
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.
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.
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.
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Tack Free Time Test Methods
|Tack Free Time||Test Method|
|240 min||CTM 0095, 1/2 hour cataly|
|840 min||CTM 0095, 2 hour catalyst|
Work / Pot Time Test Methods
|Work / Pot Time||Test Method|
|30 min||CTM 0092A,1/2|
|120 min||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.|
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.|
Tensile Strength Test Methods
|Tensile Strength||Test Method|
|5.2 (Mpa)||CTM 0137A, ASTM D412|
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|
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
|4 %||CTM 0137A|
Shore A Hardness Test Methods
|Shore A Hardness||Shore Hardness Test Method|
|46||CTM 0099, ASTM D2240|
Density Test Methods
|0.001 g/cm³||25°C||CTM 0022, ASTM D792|