Dow 93-104 Ablative Material
Application Type Bond, Coat, Seal 1 Part or 2 Part 2-Part Material Form Liquid, Silicone elastomer Substrate Glass, Aluminium, Silicone resin laminates, Polyester, Primed steel foil, Cork, Stainless Steel, Titanium, Phenolic, Cured silicone rubber, Epoxy, Metals Industry Aerospace, Aircraft, Hyper-velocity vehicles Manufacturer Dow Chemistry Silicone elastomer Application Method Trowel Cure Method Base/Curing Agent Cure Temperature (°C) 150, 65, 65 Cure Time (min) 60, 60, 30 to 60 Viscosity (cPs) 200000 (mPa.s) Ozone Resistance Good Ozone resistance High Temperature Resistance (°C) 200 Low Temperature Resistance (°C) -65 Density (g/cm³) 0.001
Technical Data for Dow 93-104 Ablative Material
1 Part or 2 Part
- Elastomer - Silicone elastomer
- Silicone - Silicone elastomer
- Spatula/Trowel - Trowel
- 2-Part Cure - Base/Curing Agent
Cure Temperature (°C) 150, 65, 65 Test Method Cure Time (min) 60, 60, 30 to 60 Test Method Viscosity (cPs) 200000 (mPa.s) Test Method Work / Pot Time (min) 360 Test Method Mix Ratio 10:1 (by volume), 10:1 (by weight)
Peel Strength (piw) 2.6 (kN/m) Test Method Shear Strength (psi) 1.8 (Mpa) Test Method Tear Strength (piw) 10 (kN/m) Test Method Tensile Strength (psi) 1.8 (Mpa) Test Method
Ozone Resistance Good Ozone resistance Environmental Resistance Good High Temperature Resistance (°C) 200 Low Temperature Resistance (°C) -65 Moisture/Humidity Resistance Good
Thermal Conductivity (W/m°K) Low, 0.35 Test Method
Shore A Hardness 70 Test Method Elongation (%) 1 Test Method
Coefficient of Thermal Expansion (CTE) 7.5 (Volume (1/K)) Test Method Density (g/cm³) 0.001 Test Method
Shelf Life Details When stored at or below 32°C in the original unopened containers, this product has a usable life of 12 months from the date of production., Catalysed material can be stored for up to 2 weeks at temperatures between -40 and -65°C. Such materials should be brought to room temperature 15 minutes before use. Shelf Life Type from the date of production Shelf Life (mon) 12
Best Practices for Dow 93-104 Ablative Material
DOW CORNING 93104 Ablative material 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. With most surfaces, substantially stronger and more uniform bonds are obtained by preparing the surface with a primer. DOW CORNING® 1200 Primer or DOW CORNING® 92023 Primer are recommended for use with DOW CORNING 93104 Ablative Material. 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. In thin sections, a primer may be needed.
DOW CORNING 93104 Ablative Material can be applied directly by casting or coating or diluted for applications requiring a sprayon consistency. When using a spray method, dilute the base portion to the desired consistency using heptane or naptha (see Handling Precautions) with flash points of 10°C or 16°C to obtain the best results. Laboratory tests were conducted to determine the most effective spray equipment and pressures for a formulation of 70% solids. Coatings of 0.05mm are applied per pass. Smoothest coatings result by delaying 3 minutes between passes.
DOW CORNING 93104 Catalyst is added in a ratio of 1 part to 10 parts of DOW CORNING 93104 Base by weight. The base should be de-aired in standard vacuum equipment for 20 to 30 minutes, hand mixed with the catalyst for 2 to 5 minutes, then deaired an additional 5 to 10 minutes. The material may be mixed mechanically using equipment such as the Semco® Pressure Mixer, model S-1350 or S-1378. Slow speeds and low shear rates must be used to avoid changing the physical properties of the ablative material.
At normal room temperature, approximately 25°C, DOW CORNING 93104 Ablative Material remains workable for about 5 hours after catalyst addition. For complete cure the ablative must be heated. A coating 6mm thick will cure within 30 - 60 minutes if the temperature is maintained at 65°C. Cure will not be accelerated at the centre of the piece until the entire mass has reached the elevated temperature.
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Cure Temperature Test Methods
|Cure Temperature||Cure Time Test Method|
|150°C||As cured, after 1 hour at 150°C|
|65°C||A coating 6mm thick will cure within 30 - 60 minutes if the temperature is maintained at 65°C.|
Cure Time Test Methods
|Cure Time||Test Method|
|60 min||As cured, after 1 hour at 150°C|
|30 to 60 min||A coating 6mm thick will cure within 30 - 60 minutes if the temperature is maintained at 65°C.|
Viscosity Test Methods
Work / Pot Time Test Methods
|Work / Pot Time||Test Method||Temperature|
|360 min||CTM 0092A||25°C|
Peel Strength Test Methods
|Peel Strength||Cure Time||Cure Temperature||Substrate||Test Method|
|2.6 (kN/m)||60 min||25°C||Primed steel foil||CTM 0293, at 100% cohesive failure|
Tear Strength Test Methods
|Tear Strength||Cure Time||Cure Temperature||Test Method|
|10 (kN/m)||60 min||150°C||CTM 0159A, ASTM D 624, Die B|
Tensile Strength Test Methods
|Tensile Strength||Cure Time||Cure Temperature||Test Method|
|1.8 (Mpa)||60 min||150°C||CTM 0137A, ASTM D412|
Shear Strength Test Methods
|Shear Strength||Type||Cure Time||Cure Temperature||Test Method|
|1.8 (Mpa)||Lap shear strength||60 min||150°C||CTM 0293|
Thermal Conductivity Test Methods
|Thermal Conductivity||Temperature||Test Method|
|Low||25 to 100°C||Thermal Conductivity Test Method|
|0.35 W/m°K||As cured, after 1 hour at 150°C|
Elongation Test Methods
|1 %||CTM 0137A|
Shore A Hardness Test Methods
|Shore A Hardness||Shore Hardness Test Method||Hardness Temperature|
|70||CTM 0099, ASTM D2240, As cured, after 1 hour at 150°C||150°C|
Coefficient of Thermal Expansion (CTE) Test Methods
|Coefficient of Thermal Expansion (CTE)||CTE Temperature (°C)||CTE Time||CTE Test Method|
|7.5 (Volume (1/K))||150°C||60 min||As cured, after 1 hour at 150°C|
Density Test Methods
|0.001 g/cm³||25°C||CTM 0022, ASTM D792, As cured, after 1 hour at 150°C|