• Description for 3M 346

    A heavy duty natural colored flat stock paper tape for indoor and outdoor protection of many metals, plastics and materials in transit and features a heavy duty weather resistant backing.

    *See Terms of Use Below

    Application Type Bond
    1 Part or 2 Part 1 Part
    Material Form Protective Tape
    Substrate Copper, Brass, Metal, Plastics, Steel, Windows
    Industry Outdoor motors, Protection of aircraft windows, Protection of aircraft surfaces, Protection of boat deck surfaces, Protection of aircraft parts, Protection of aircraft wings
    Manufacturer 3M
    Chemistry Rubber
    Cure Method Pressure Sensitive
    Color Tan
  • Technical Data for 3M 346

    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 1 Part
    • Material Form
      • Tape - Protective Tape
    • Substrate
    • Industry
      • Marine - Protection of boat deck surfaces
      • Aerospace Window - Protection of aircraft windows
      • Aircraft - Protection of aircraft surfaces, Protection of aircraft wings, Protection of aircraft parts
      • Industrial
      • Motors - Outdoor motors
      • Other - Protection of interior cabin surfaces, Steel tank protection during fabrication/welding
    • Chemistry
      • Other - Rubber
    • Cure Method
      • Pressure Sensitive (min) - Pressure Sensitive
    • Color
      • Brown - Tan
    Cure Specs
    Application Temperature (°F) 60 to 100
    Bond Strength
    General Bond Strength (psi) 22 (oz./in.) Test Method
    Tensile Strength (psi) 28 (lbs./in.) Test Method
    Material Resistance
    Abrasion Resistance abrasion resistance
    Moisture/Humidity Resistance moisture resistant
    Elongation (%) 4 Test Method
    Business Information
    Shelf Life Details Storage: Store in a clean, dry environment between 60-80°F (15-27°C) and 40-50% relative humidity.
    Shelf Life Temperature (°F) 140 to 176
    Shelf Life Type From date of manufacture.
    Shelf Life (mon) 12
    Not Good For
    Don't Use For Not designed for paint masking or sand blast operations
  • Best Practices for 3M 346

    *See Terms of Use Below

    1. Surface Preparation

      The surface to which tape is to be applied should be clean and free of all traces of oil and moisture.

    2. Testing

      Test for clean removal on all anodized aluminum surfaces. Improper sealing of surface causes adhesive transfer

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Tensile Strength Test Methods
Tensile Strength Test Method
28 (lbs./in.) ASTM D-3759, width
General Bond Strength Test Methods
General Bond Strength Substrate Test Method
22 (oz./in.) Steel ASTM D-3330, width
Elongation Test Methods
Elongation Test Method
4 % D-3759 (at Break)