DAPCO™ 3301 is a clear, two-component, low viscosity silicone adhesive. The product cures at room temperature (70 ºF) and features:
  • Service temperature range from -65 ºF to 200 ºF
  • Bonds silicone rubber to a variety of substrates
  • Weatherability
  • Qualified to aircraft manufacturer specifications
  • No outgassing during cure
Unit of Measure


Adhesive Type

N/A Silicone

Shelf Life

N/A 6 months

Typical Properties

Part A Color

N/A Clear

Part B Color

N/A Clear

Mixed Color

N/A Clear

Part A Solids

N/A 55 %

Part B Solids

N/A 15 %

Mixed Solids

N/A 54 %

Part A Appearance

N/A Liquid

Part B Appearance

N/A Liquid

Mixed Appearance

N/A Liquid

Part A Viscosity at 72 Degree Fahrenheit (ºF) Temperature

N/A 2000 cP

Part B Viscosity at 72 Degree Fahrenheit (ºF) Temperature

N/A 7 cP

Mixed Viscosity at 72 Degree Fahrenheit (ºF) Temperature

N/A 1900 cP

Part A Density

N/A 9.0 lb/gal

Part B Density

N/A 7.0 lb/gal

Mixed Density

N/A 8.0 lb/gal


Recommended Mix Ratio by Weight (Part A/Part B)

N/A 100/3.3

Recommended Mix Ratio by Volume (Part A/Part B)

N/A 100/4.2

Note for Mix Ratio Weight

N/A When mixing, it is recommended that a clean glass or metal container be used. Weight or measure Part A and then carefully add Part B (excessive amounts of curing agent will reduce working life).

The presence of contaminants such as grease, oil, urethanes, epoxies, etc., will inhibit cure and may contribute to a tacky surface. Mix the two components until they are thoroughly blended.

Working Life

N/A After mixing, the adhesive is useable for periods up to three hours at room temperature (70 ºF). Solvent evaporation will reduce working life and increase viscosity significantly. Maximum working life is insured by covering the container when not being used. Material which has partially gelled should be discarded and a fresh mixture prepared.


N/A Apply a thin, continuous film of DAPCO™ 3300 to both substrates. Allow solvent to evaporate for 20 to 30 minutes at 70 ºF. Assemble substrates and apply moderate pressure to achieve intimate contact. To develop optimum adhesion, a seven day cure at room temperature (70 ºF) is recommended. Cure can be accelerated by an overnight gel period followed by exposure for 4 to 6 hours at 160 ºF.

Typical Cured Properties

Adhesion Strength for Bonding Silicone Rubber to Silicone Rubber

N/A 12 lb/in
Adhesion Strength for Bonding Silicone Rubber to Aluminum1 N/A 14 lb/in
Adhesion Strength for Bonding Silicone Rubber to Phenolic Substrates2 N/A 10 lb/in

Note for Typical Cured Properties

N/A When cured in accordance with the recommended schedule, the above typical properties are developed.

Surface Preparation

Surface Preparation

N/A The substrates must be free from contaminates, i.e, dirt, oil, grease, etc. Clean the surface by wiping with a suitable solvent/cleaning agent and dry thoroughly. In most cases, DAPCO™ 1-100 Primer should be used to improve adhesion to metal substrates. DAPCO™ 1-100 should not be applied to the silicone rubber surface. Allow 45 minutes for the primer to cure. The adhesive must be applied within 90 minutes after primer has cured. When circumstances prevent immediate application of DAPCO™ 3300, the surface must be thoroughly cleaned to remove the primer before repeating the entire process.

Storage and Handling

Storage and Handling

N/A Store in a cool, dry place at temperature below 80 ºF. Keep containers tightly sealed and take precautions to avoid solvent evaporation. When properly stored, the material is stable for a period of 6 months from the date of shipment.



N/A DAPCO™ 3300 contains flammable solvents. Keep away from excessive heat or any other source of ignition. Exercise good housekeeping practices. Material Safety Data Sheets available upon request.



N/A DAPCO™ 3301 demonstrates good adhesion when bonding silicone rubber sheet stock, extrusions, and RTV compounds to themselves as well as metal, glass and plastic substrates. DAPCO™ 3301 can be applied using a variety of methods develops a flexible bond whe



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 When used with DAPCO™ 1-100 Primer
  • 2 When used with DAPCO™ 1-100 Primer