• Description for 3M 235

    Permanent semiflexibility, thermal shock and impact resistance, good electrical and adhesion properties.

    *See Terms of Use Below

    Application Type Casting
    1 Part or 2 Part 2 Part
    Material Form Photographic Tape
    Substrate Metal, steel
    Industry General purpose camera applications, Repairing camera bellows.
    Manufacturer 3M
    Chemistry Rubber
    Cure Method Oven-curing
    Color Black
    High Temperature Resistance (°C) Thermal Shock Resistance
    Density (g/cm³) 1.150, 1.020
  • Technical Data for 3M 235

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 2 Part
    • Material Form
      • Tape - Photographic Tape
    • Substrate
    • Industry
      • Cameras - General purpose camera applications, Repairing camera bellows.
      • Industrial
      • Other - Masking out unwanted portions of negatives., Sealing film envelopes and metal film containers
    • Chemistry
      • Other - Rubber
    • Cure Method
      • Heat - Oven-curing
    • Color
      • Black
    Specifications
    Bond Strength
    General Bond Strength (psi) 23 (oz./in.) Test Method
    Compressive Strength (psi) 1,300 Test Method
    Flexural Strength (psi) 3,200 Test Method
    Tensile Strength (psi) 1,300, 22 (lbs./in.) Test Method
    Material Resistance
    High Temperature Resistance (°C) Thermal Shock Resistance
    Impact Resistance Impact Resistance
    Conductivity
    Dielectric Strength (V/mil) Good
    Hardness
    Elongation (%) 9 Test Method
    Flexibility Permanent semiflexibility
    Other Properties
    Specific Gravity 1.100 Test Method
    Coefficient of Thermal Expansion (CTE) 16e-5 (length/unit length/°C) Test Method
    Flash Point (°F) 401.0, 350.6
    Density (g/cm³) 1.150, 1.020
    Business Information
    Shelf Life Details Storage: Both parts of this resin system should be stored at temperatures between 20 to 30 degrees Celsius, and 30% to 60% relative humidity. When not in use, containers should be kept tightly closed. Storage at conditions outside those suggested may compromise the performance of the resin.
    Shelf Life Temperature (°F) 68 to 86
    Not Good For
    Don't Use For Not recommended for outdoor applications
  • Best Practices for 3M 235

    *See Terms of Use Below

    1. Application

      Pour the warm resin into the preheated 100ºC mold. If no mold is used, dip the preheated part into the resin. Heating the resin and mold aids impregnation. For maximum impregnation, evacuate for 5 to 15 minutes at 5 mm of mercury (Hg) absolute pressure, or pour under vacuum and hold for several minutes before releasing.

    2. Mixing

      Mix the separate parts before removing them from their containers. They may be warmed to 60ºC (140ºF) to aid mixing. Weigh the correct proportions of the separate parts to within 2% accuracy and combine them. Thoroughly blend the mixture until the color is absolutely uniform or a homogeneous mixture is obtained.

    3. Curing

      Where minimum stress and maximum thermal shock resistance are required, the lower temperature cure cycle is recommended. (See “Curing Guide” of Handling Properties section). Time should be added to the cure cycle to allow the resin to reach the curing temperature.

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Tensile Strength Test Methods
Tensile Strength Test Method
1,300 psi Fed. Std. No. 406, Method 1011, 1/8" x 1/2" Sample
22 (lbs./in.) ASTM D-3759, at Break, width
Compressive Strength Test Methods
Compressive Strength Test Method
1,300 psi Fed. Std. No. 406, Method 1021, 10% Compression
Flexural Strength Test Methods
Flexural Strength Test Method
3,200 psi Fed. Std. No. 406, Method 1031, (1/2" x 1/2" Sample)
General Bond Strength Test Methods
General Bond Strength Substrate Test Method
23 (oz./in.) Steel ASTM D-3330, width
Elongation Test Methods
Elongation Test Method
9 % D-3759 (at Break)
Coefficient of Thermal Expansion (CTE) Test Methods
Coefficient of Thermal Expansion (CTE) CTE Temperature (°C) CTE Test Method
16e-5 (length/unit length/°C) 23 to 113°C MIL-I-16923E, Linear
Specific Gravity Test Methods
Specific Gravity Test Method
1.100 Cured