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DAPCO™ 2900 is a two-part, organo-modified silicone sealant with 500 ºF service temperature that can withstand 2000 ºF flame while providing adequate thermal insulation to substrates it is coated on. The product has good resistance to fluids found in the aviation environment, including phosphate ester hydraulic fluids and engine oils (MIL-L-7808, MIL-PRF-23699 HTS), and unlike conventional condensation curing silicone products will not degrade in these fluids at 150 ºF; it will retain its physical integrity after immersion in JRF Type VII, JP-4 and JET-A fuels. Additionally, DAPCO™ 2900 is formulated to be 'paint shop friendly' with no free silicone that can 'bleed out' of the cured material, in addition epoxy-based aerospace primers show excellent adhesion when applied to the sealant.
Unit of Measure

Physical and Mechanical Properties

Specific Gravity

 N/A 1.4 g/cm³

Cure Hardness

 N/A 65 Shore "A"

Tensile Strength

 N/A 450 psi

Elongation

 N/A 100 %

Test Method for Elongation

 N/A American Society for Testing and Materials (ASTM D412)

Flatwise Tensile Strength

 N/A 100 psi

Test Method for Flatwise Tensile Strength

 N/A American Society for Testing and Materials (ASTM D1002)

Peel Strength

 N/A 7.0 lb/in

Test Method for Peel Strength

 N/A American Society for Testing and Materials (ASTM 5127/1)

Lap Shear Strength for Stainless Steel

 N/A 400 psi

Lap Shear Strength for Titanium

 N/A 450 psi

Test Method for Lap Shear Strength

 N/A American Society for Testing and Materials (ASTM D1002)

Maximum Temperature Recorded

 N/A 750 ºF

Thermal Conductivity

 N/A 0.219 W/m·K

Note for Physical and Mechanical Properties

 N/A Thermal Insulation at 2000 ºF/15 minutes, 0.05 inch coating on epoxy-primed aluminum:

No flame penetration or ignition of the sealant when tested per AS5127/2 (15 minutes direct flame impingement at 2000 ºF)

Environmental Exposure

Absorption for BMS 3-11 at Room Temperature (RT)/48 Hours (h) Immersion

 N/A 12 %

Absorption for BMS 3-11 at 160 Degree Fahrenheit (ºF) Temperature/168 Hours (h) Immersion

 N/A 25 %

Absorption for JRF Type VII at Room Temperature (RT)/48 Hours (h) Immersion

 N/A 150 %

Absorption for JP-4 at Room Temperature (RT)/48 Hours (h) Immersion

 N/A 70 %

Absorption for at 120 Degree Fahrenheit (ºF) Temperature/168 Hours (h) Immersion

 N/A 70 %

Absorption for JET-A at Room Temperature (RT)/48 Hours (h) Immersion

 N/A 45 %

Absorption for MIL-PRF-23699 at Room Temperature (RT)/48 Hours (h) Immersion

 N/A 3 %

Hardness after Exposure for BMS 3-11 at Room Temperature (RT)/48 Hours (h) Immersion

 N/A 55 "A"

Hardness after Exposure for JP-4 at Room Temperature (RT)/48 Hours (h) Immersion

 N/A 60 "A"

Hardness after Exposure for JET-A at Room Temperature (RT)/48 Hours (h) Immersion

 N/A 65 "A"

Surface Preparation

Surface Preparation

 N/A The substrate must be free from contamination, i.e. dirt, oil grease, etc. Clean the surface by wiping with a suitable solvent/cleaning agent and dry thoroughly. DAPCO™ 1-100 Primer is required for adhesion to most metallic substrates.

Application and Curing Information

Application and Curing Information

 N/A DAPCO™ 2900 is a 2-part sealant supplied in standard aerospace injection kits; machine mixing of the kit is recommended for optimum performance. The mixed sealant is non-slumping and can be readily applied to vertical and overhead surfaces.

Application Life Time

 N/A 90 minutes

Cure To Tack-Free Time

 N/A 4 hour

Cure To Handle

 N/A Overnight

Full Cure Time at Room Temperature (RT)

 N/A 7 days
Accelerated Cure Time1 N/A 1 hour

Specifications

Shelf Life

 N/A 6 months

Color

 N/A Red

Storage and Handling

Storage and Handling

 N/A Shelf Life: 6 months from date of shipment at room temperature.
Store below 80 ºF in a dry place

Safety

Safety

 N/A Exercise good housekeeping practices. Material Safety Data Sheets available upon request.

Applications

Applications

 N/A
  • Sealing joints against passage of fluids, air, and flame
  • Sealing faying surfaces of mating parts
  • Aero smoothing on high temperature areas
  • Coating for insulating
  • Ablative heat shielding
  • Aircraft field repair over a variety of materials
  • High temperature sealing in painted areas

Note

Note

 N/A The information in this bulletin is believed to be reliable, however, when evaluating any product, the user should consider factors such as processing and environmental conditions, which may influence performance. Seller is not responsible for any commercial loss or damage arising from the use of this product. The user is responsible for determining the product's acceptability for a specific purpose and to establish safety precautions as may be required. No statements or recommendations contained in this bulletin are to be construed as inducements to infringe any relevant patent.
  • 1 At room temperature, followed by 2 hours at 160 ºF.