• Description for 3M 78ET

    Industrial grade, versatile bulk spray adhesive formulated for specific substrates and market needs (soft foams - polystyrene foams). The adhesive is packaged in convenient, portable, no maintenance aerosol cylinders.

    *See Terms of Use Below

    Application Type Bond
    1 Part or 2 Part 1 Part
    Material Form Liquid, Synthetic elastomer
    Substrate Acrylic, Aluminum, FRP (Fiber Reinforced Plastic), Fabrics, Glass, Metal, Heavy papers, Most plastics, Polypropylene, Wood, Concrete, Polystyrene foams, Polyethylene, Galvanized, Soft foams, ABS, Birch, Polystyrene foams
    Industry Refrigerators, Motor homes, Store displays, HVAC
    Manufacturer 3M
    Chemistry Synthetic elastomer, Non Flammable Solvent
    Cure Method Solvent
    Cure Time (min) Fast, 1.00 to 2.00
    Color Green, Clear, Translucent
    High Temperature Resistance (°C) High temperature resistance
    Density (g/cm³) 6.12 (lbs/gal)
  • Technical Data for 3M 78ET

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 1 Part
    • Material Form
      • Elastomer - Synthetic elastomer
      • Liquid
    • Substrate
    • Industry
      • Recreational Vehicles - Motor homes
      • Electronics - Refrigerators
      • Displays - Store displays
      • Industrial
      • HVAC
      • Appliances
      • Construction
      • Other - Tub surrounds, Insulation to walls, Attach insulation to pipes and ductwork
    • Chemistry
      • Non-flammable - Non Flammable Solvent
      • Other - Synthetic elastomer
    • Application Method
      • Dispenser - Applicator
      • Spray - Lace
    • Cure Method
      • Solvent
    • Color
      • Translucent
      • Clear / Transparent - Clear
      • Green
    Specifications
    Cure Specs
    Application Temperature (°F) 60 to 80
    Cure Time (min) Fast, 1.00 to 2.00
    Set Time (min) 1.00 to 5.00
    Work / Pot Time (min) 1.00 to 60, Long
    Bond Strength
    General Bond Strength (psi) High
    Shear Strength (psi) 134, 97, 167, 190, 184, 70, 148, 89, 63, 98, 158 Test Method
    Tensile Strength (psi) 30 (grams) Test Method
    Material Resistance
    High Temperature Resistance (°C) High temperature resistance
    Moisture/Humidity Resistance Good moisture resistance
    Other Properties
    % Solids (%) High, 31, 17, 17, 31
    Density (g/cm³) 6.12 (lbs/gal)
    Business Information
    Shelf Life Details Storage: Store product at 60°-80°F (16°-27°C) for maximum storage life. Higher temperatures reduce normal storage life. Lower temperatures may cause increased viscosity of a temporary nature. Rotate stock on a “first in-first out” basis.;When stored at the recommended conditions in the original, unopened container, this product has a shelf life of 15 months from date of shipment.
    Shelf Life Temperature (°F) 60 to 80
    Shelf Life Type From date of shipment
    Shelf Life (mon) 15
  • Best Practices for 3M 78ET

    *See Terms of Use Below

    1. Surface Preparation

      For best results, all surfaces to be bonded must be clean, dry and free from dirt, dust, oil, loose paint, wax or grease, etc.

    2. Application

      Slowly open the cylinder valve and inspect the connections for any leaks. Tighten if needed.

      Fully open the valve.

      Unscrew the trigger stop/adjusting nut away from the trigger 3-4 turns and spray a test pattern. For more adhesive output, continue to screw the nut away from the trigger. For less adhesive output, screw the nut back towards the trigger.

      Hold the applicator 3-10 inches away from the surface to be sprayed and apply a uniform coat of adhesive. (The smaller the spray pattern chosen in step 3, the closer the applicator gun will need to be to the surface and vice versa for larger patterns.)

      Apply 1-3 even coats of adhesive. (This will depend on the needed coverage for the bonding application.)

    3. Curing

      Allow adhesive to dry until tacky and then apply sufficient pressure to ensure complete contact.

    4. Clean-Up

      When using solvents, extinguish all ignition sources, including pilot lights, and follow the manufacturer’s precautions and directions for use.

    5. Testing

      Test the tackiness by gently touching the adhesive with your knuckle. If the adhesive transfers to your skin, it is too wet. If the adhesive is aggressively tacky and does not transfer to your skin, it is ready to bond. If the adhesive is too dry or only has a very light tack, it is too dry and another coat of adhesive should be applied to at least one of the surfaces.

    6. Troubleshooting

      How to Eliminate Cold Weather Problems: Store the cylinders in a controlled environment with temperatures between 60°-80°F (16°-27°C)

      Keep cylinders off of cold concrete floors and away from outside walls

      Use heat belts or blankets, approved for use with flammable adhesives, to control the temperature of the cylinders.

      Allow additional time for solvents and propellants to flash off, when temperatures are below 60°F (16°C).

      If the system sprays poorly or won’t spray at all: The sequence below runs through a complete clog into the cylinder valve. If at any time during the sequence the problem is resolved, stop, clean the needed parts, put the system back together, and you are finished.

      Make sure the cylinder is not empty.

      Make sure the cylinder valve is open.

      Close the applicator trigger stop adjusting nut and clean the nozzle tip. (Does it spray now?)

      Take off the nozzle and try spraying. (Does it spray now?) Clean the nozzle.

      Shut off the cylinder valve, CAREFULLY and SLOWLY – loosen the applicator gun/hose connection and look for adhesive to squirt out. If adhesive starts to leak out, allow it to slowly continue to do so until it stops. (This will be a little messy, but you will need to bleed off the pressurized adhesive to clean the applicator gun.) The applicator gun has a clog at the valve, stem or inlet area and needs to be cleaned.

      If nothing leaks out after fully loosening the applicator gun, CAREFULLY remove applicator gun, realizing that the hose may be clogged but could be full of adhesive and pressure depending on where the clog is. (Secure the open end of the hose into a bucket in case the clog releases and the system flushes.)

      CAREFULLY and SLOWLY loosen the hose connection at the cylinder valve. Look for adhesive to squirt out. If adhesive starts to leak out, allow it to slowly continue to do so until it stops. (This will be a little messy, but you will need to bleed off the pressurized adhesive in the hose). Clean or replace the hose.

      With everything now isolated from the cylinder, place a bucket in front of the cylinder valve and slowly open it to see if any adhesive comes out. If it does, put the cleaned system parts back together. If it does not, there is something wrong with the cylinder or cylinder valve and it should be returned.

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Tensile Strength Test Methods
Tensile Strength Cure Time Test Temperature Test Method
30 (grams) 10 min 93°C 4 square inch bonds tested with 30 grams hanging in tensile. Temperature is held for 10 minutes and ramped at 10°F increments, until complete failure.
Shear Strength Test Methods
Shear Strength Type Substrate Test Temperature Test Method
134 psi Overlap shear strength ABS to ABS (2 surface adhesive bond) 24°C 1 square inch bonds tested at 2 inches per minute separation rate at 75°F (24°)
97 psi Overlap shear strength ABS to ABS (1 surface adhesive bond) 24°C 1 square inch bonds tested at 2 inches per minute separation rate at 75°F (24°)
167 psi Overlap shear strength Acrylic to Acrylic (2 surface adhesive bond) 24°C 1 square inch bonds tested at 2 inches per minute separation rate at 75°F (24°)
190 psi Overlap shear strength Aluminum to Aluminum (2 surface adhesive bond) 24°C 1 square inch bonds tested at 2 inches per minute separation rate at 75°F (24°)
184 psi Overlap shear strength Birch to Birch (2 surface adhesive bond) 24°C 1 square inch bonds tested at 2 inches per minute separation rate at 75°F (24°)
70 psi Overlap shear strength Birch to Birch (1 surface adhesive bond) 24°C 1 square inch bonds tested at 2 inches per minute separation rate at 75°F (24°)
148 psi Overlap shear strength Galvanized to Galvanized (2 surface adhesive bond) 24°C 1 square inch bonds tested at 2 inches per minute separation rate at 75°F (24°)
89 psi Overlap shear strength Galvanized to Galvanized (1 surface adhesive bond) 24°C 1 square inch bonds tested at 2 inches per minute separation rate at 75°F (24°)
63 psi Overlap shear strength Polyethylene to Polyethylene (2 surface adhesive bond) 24°C 1 square inch bonds tested at 2 inches per minute separation rate at 75°F (24°)
98 psi Overlap shear strength Polypropylene to Polypropylene (2 surface adhesive bond) 24°C 1 square inch bonds tested at 2 inches per minute separation rate at 75°F (24°)
158 psi Overlap shear strength FRP (Fiber Reinforced Plastic) to FRP (2 surface adhesive bond) 24°C 1 square inch bonds tested at 2 inches per minute separation rate at 75°F (24°)