Dow 93-104 Ablative Material Datasheet Dow 93-104 Ablative Material

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  • Description for Dow 93-104 Ablative Material

    Withstands high temperature extremes; good resistance to weathering, moisture and ozone; low thermal conductivity; tough tenacious char characteristics.

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    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, 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
  • Best Practices for Dow 93-104 Ablative Material

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    1. Surface Preparation

      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.

    2. Application

      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.

    3. Mixing

      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.

    4. Curing

      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
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
60 min
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
Viscosity Temperature
200000 (mPa.s) 25°C
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
Elongation Test Method
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
Density Temperature Test Method
0.001 g/cm³ 25°C CTM 0022, ASTM D792, As cured, after 1 hour at 150°C