DowSil 3-6077 RTV Silicone Ablative

Harmonization Code : 3910.00.00.90 | Silicones in Primary Forms; Others

DowSil 3-6077 RTV Silicone Ablative

Main features

  • 0.035 mm/s Ablation Penetration Rate
  • 2 to 3-Hour Working Window
  • Spray or Trowel Application

Product Description

DOWSIL™ 3-6077 RTV Silicone Ablative is a two-part, non-slumping silicone elastomer developed for aerospace ablative protection. The room-temperature-curing system can be sprayed or trowelled for use as an ablative coating, thermal barrier, high-temperature pressurization sealant, or rocket liner. It combines low thermal conductivity with flexibility across temperature extremes and forms a moderately tough char that can be removed after exposure to support surface cleaning and recoating.

Key features

  • Ablative thermal protection: Provides a documented penetration rate of 0.035 mm/s under an oxy-acetylene torch exposure of 45 W/cm².
  • Room-temperature cure: Uses a 10:1 base-to-catalyst mix ratio by weight and cures in 24 hours at 25 °C.
  • Flexible application: Non-slumping material can be sprayed, trowelled, applied with a spatula, or dispensed from a pressure gun.

Applications / Suitable for

  • Protection of launch structures exposed to direct rocket blast
  • Ablative coatings and thermal barriers
  • High-temperature pressurization seals
  • Rocket liner applications
Product Family

DOWSIL 3-6077

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Color
The color
white/blue
Density
Volumetric mass per unit
1.58 kg/m3
Mix Ratio
The amount of a constituent divided by the total amount of all other constituents in a mixture
10:1
Physical Properties
Viscosity
Viscosity is a measurement of a fluid’s resistance to flow. Viscosity is commonly measured in centiPoise (cP). One cP is defined as the viscosity of water and all other viscosities are derived from this base. MPa is another common unit with a 1:1 conversion to cP. A product like honey would have a much higher viscosity -around 10,000 cPs- compared to water. As a result, honey would flow much slower out of a tipped glass than water would. The viscosity of a material can be decreased with an increase in temperature in order to better suit an application
1,9000,000 mPa.s
Mechanical Properties
Elongation
Elongation is the process of lengthening something. It is a percentage that measures the initial, unstressed, length compared to the length of the material right before it breaks. It is commonly referred to as Ultimate Elongation or Tensile Elongation at break.
50 %
Thermal Properties
Thermal Conductivity
Thermal conductivity describes the ability of a material to conduct heat. It is required by power packages in order to dissipate heat and maintain stable electrical performance. Thermal conductivity units are [W/(m K)] in the SI system and [Btu/(hr ft °F)] in the Imperial system.
0.29 W/m.K

Additional Information

Technical properties

As-supplied / before-processing properties

Typical uncured and processing properties of DOWSIL™ 3-6077 RTV Silicone Ablative. Typical technical data are not intended for specification purposes.

Property Value Unit Method / condition
Product form Two-part, non-slumping silicone elastomer — As supplied
Consistency Viscous liquid — As supplied
Color White base / blue catalyst — As supplied
Base viscosity 1,900,000 mPa·s CTM 0050 / ASTM D1084; at 25 °C
Mixing ratio 10 base : 1 catalyst by weight Catalyzed mixture
Relative density 1.58 — CTM 0022; mixed 10:1 by weight at 25 °C
Working time 2–3 hours After catalyst addition at approximately 25 °C
Cure time 24 hours At 25 °C
Usable life 12 months Original unopened containers stored at or below 32 °C

 

Technical properties

After-processing / final-state properties

Typical cured properties of DOWSIL™ 3-6077 RTV Silicone Ablative after seven days at room temperature, except where otherwise noted. Typical technical data are not intended for specification purposes.

Property Value Unit Method / condition
Tensile strength 4.2 MPa CTM 0137A / ASTM D412; cured 7 days at room temperature
Elongation at break 50 % CTM 0137A / ASTM D412; cured 7 days at room temperature
Durometer hardness 73 Shore A CTM 0099 / ASTM D2240; cured 7 days at room temperature
Deep-section cure Yes — 25 mm thickness
Thermal conductivity 0.29 W/(m·K) Cured material; test method not stated
Specific heat 1.04 kJ/(kg·K) At 25 °C; test method not stated
Ablation penetration rate 0.035 mm/s Oxy-acetylene torch exposure at 45 W/cm²
Char retention Fair — Oxy-acetylene torch exposure at 45 W/cm²

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