• Description for 3M DP640

    Brown is a two-part, non-sag/thixotropic urethane adhesives. It provides tough, flexible bonds with good adhesion to a wide variety of substrates.

    *See Terms of Use Below

    Application Type Bond
    1 Part or 2 Part 2 Part
    Material Form Liquid
    Substrate Aluminum, Glass, Painted metals, Many properly abraded and cleaned plastics, Polycarbonate, PVC, EPDM, Rubber, SBR, Cold rolled Steel, Wood, FRP, Ceramics, Nylon, Acrylic, Etched Aluminum, Rigid PVC, Steel, Primed Aluminum
    Manufacturer 3M
    Chemistry Isocyanate, Polyol, Polyurethane, Urethane
    Cure Method Base/Accelerator
    Cure Temperature (°C) 23
    Cure Time (min) 10,080
    Viscosity (cPs) Non-sag, <25,000
    Color Brown
    Chemical Resistance 1, 1, 1-Trichlorethane, Acetone, Freon TF, Freon TMC, Isopropyl Alcohol, RMA Flux
    Relative Solvent Resistance Chemical Resistance: Solvent
    Durability Tough
    Density (g/cm³) 10.1 to 10.5 (weight (lbs/gal)), 11.1 to 11.5 (weight (lbs/gal))
  • Technical Data for 3M DP640

    Overview
    Specifications
    Cure Specs
    Cure Temperature (°C) 23 Test Method
    Cure Time (min) 10,080 Test Method
    Viscosity (cPs) Non-sag, <25,000 Test Method
    Fixture or Handling Strength Time (min) 360 to 480 Test Method
    Work / Pot Time (min) 5.00 to 40, Long, 40 Test Method
    Mix Ratio 1:1 (by volume), 1:1 (by weight)
    Bond Strength
    General Bond Strength (psi) Good
    Peel Strength (piw) 64 Test Method
    Shear Strength (psi) 2,000, 300, 2,000, 1,850, 950, 1,150, 3,300, 2,160, 450, 2,160, 1,960, 740, 1,210, 1,180, 1,160, 460 Test Method
    Material Resistance
    Chemical Resistance 1, 1, 1-Trichlorethane, Acetone, Freon TF, Freon TMC, Isopropyl Alcohol, RMA Flux Test Method
    Relative Solvent Resistance Chemical Resistance: Solvent
    Conductivity
    Dissipation Factor 0.12000 Test Method
    Dielectric Strength (V/mil) 470 Test Method
    Dielectric Constant 5.90 Test Method
    Volume Resistivity (O) 2.6e12 (ohms/cm) Test Method
    Hardness
    Durability Tough
    Shore D Hardness 50 to 60 Test Method
    Elongation (%) 100 Test Method
    Flexibility Flexible
    Other Properties
    Density (g/cm³) 10.1 to 10.5 (weight (lbs/gal)), 11.1 to 11.5 (weight (lbs/gal))
    Business Information
    Shelf Life Details Store products at 60-80°F (16-27°C) for maximum storage life. Rotate stock on a “first-in first-out” basis.;When stored in the original, unopened container at the storage conditions suggested, these products have a shelf life of 12 months from date of shipment.
    Shelf Life Temperature (°F) 61 to 81
    Shelf Life Type from date of shipment
    Shelf Life (mon) 12
  • Best Practices for 3M DP640

    *See Terms of Use Below

    1. Surface Preparation

      For optimum strength structural bonds, paint, oxide films, oils, dust, mold release agents and all other surface contaminants must be completely removed. However, the amount of surface preparation directly depends on the required bond strength and the environmental aging resistance desired by the user.

      See Vendor technical data sheet for more information.

    2. Application

      Application to the substrates should be made within 5 minutes for Scotch-Weld urethane adhesive DP605 NS Off-White or 40 minutes for Scotch-Weld urethane adhesive DP640 Brown. Larger quantities and/or higher temperatures will reduce this working time.

      Join the adhesive coated surfaces and allow to cure at 60°F (16°C) or above until firm. Heat up to 200°F (93°C) will speed curing.

      Keep parts from moving during cure. Contact pressure is necessary. Maximum shear strength is obtained with a 3-5 mil bond line.

    3. Mixing

      Mix thoroughly by weight or volume in the ratios specified in the typical uncured properties section. Resulting color should be uniform.

    4. Clean-Up

      Excess uncured adhesive can be cleaned up with ketone type solvents.*

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

  • Comparable Materials for 3M DP640

    *See Terms of Use Below

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Cure Temperature Test Methods
Cure Temperature Cure Time Test Method
23°C The cure time is defined as the time required for the adhesive to achieve a minimum of 80% of its ultimate OLS on aluminum.
Cure Time Test Methods
Cure Time Test Method
10,080 min The cure time is defined as the time required for the adhesive to achieve a minimum of 80% of its ultimate OLS on aluminum.
Fixture or Handling Strength Time Test Methods
Fixture or Handling Strength Time Fixture-Handling Strength Test Method Fixture-Handling Strength Time Temperature
360 to 480 min Handling strength determined per test method C-3179. Time to handling strength taken to be that required to achieve a 50 psi overlap shear OLS strength using aluminum substrates. 23°C
Viscosity Test Methods
Viscosity Temperature
Non-sag
<25,000 cPs 24°C
Work / Pot Time Test Methods
Work / Pot Time Test Method Temperature
5.00 to 40 min
Long
40 min 10 g, 1/4" thick, @ 77°F (25°C) 23°C
Shear Strength Test Methods
Shear Strength Type Cure Time Cure Temperature Substrate Test Time Test Temperature Test Method
2,000 psi Overlap Shear Strength 10,080 min 23°C CRS/CRS 23°C Overlap shear bonds were tested on 1" wide test specimens with a 1/2" overlap of the adhesive bonded area. Substrates were bonded after surfaces were prepared according to the surface preparation section. They were cured for 1 week at 73°F (23°C) prior to testing. Tests were run according to Test Method ASTM D1002-72.
300 psi Overlap Shear Strength 10,080 min 23°C CRS/CRS 82°C Overlap shear bonds were tested on 1" wide test specimens with a 1/2" overlap of the adhesive bonded area. Substrates were bonded after surfaces were prepared according to the surface preparation section. They were cured for 1 week at 73°F (23°C) prior to testing. Tests were run according to Test Method ASTM D1002-72.
2,000 psi Overlap Shear Strength 10,080 min 23°C Al/Al 23°C Overlap shear bonds were tested on 1" wide test specimens with a 1/2" overlap of the adhesive bonded area. Substrates were bonded after surfaces were prepared according to the surface preparation section. They were cured for 1 week at 73°F (23°C) prior to testing. Tests were run according to Test Method ASTM D1002-72.
1,850 psi Overlap Shear Strength 10,080 min 23°C SBR/Wood 23°C Overlap shear bonds were tested on 1" wide test specimens with a 1/2" overlap of the adhesive bonded area. Substrates were bonded after surfaces were prepared according to the surface preparation section. They were cured for 1 week at 73°F (23°C) prior to testing. Tests were run according to Test Method ASTM D1002-72.
950 psi Overlap Shear Strength 10,080 min 23°C PC/PC 23°C Substrate Failure, Overlap shear bonds were tested on 1" wide test specimens with a 1/2" overlap of the adhesive bonded area. Substrates were bonded after surfaces were prepared according to the surface preparation section. They were cured for 1 week at 73°F (23°C) prior to testing. Tests were run according to Test Method ASTM D1002-72.
1,150 psi Overlap Shear Strength 10,080 min 23°C PVC/PVC 23°C Substrate Failure, Overlap shear bonds were tested on 1" wide test specimens with a 1/2" overlap of the adhesive bonded area. Substrates were bonded after surfaces were prepared according to the surface preparation section. They were cured for 1 week at 73°F (23°C) prior to testing. Tests were run according to Test Method ASTM D1002-72.
3,300 psi Overlap Shear Strength Aluminum -40°C ASTM D1002
2,160 psi Overlap Shear Strength Aluminum 23°C ASTM D1002
450 psi Overlap Shear Strength Aluminum 900 sec 82°C ASTM D1002
2,160 psi Overlap Shear Strength Aluminum 23°C (ASTM D1002), MEK/abrade/MEK
1,960 psi Overlap Shear Strength Cold Rolled Steel 23°C (ASTM D1002), MEK/abrade/MEK
740 psi Overlap Shear Strength Nylon 23°C (ASTM D1002), IPA/abrade/IPA
1,210 psi Overlap Shear Strength Polycarbonate 23°C (ASTM D1002), IPA/abrade/IPA
1,180 psi Overlap Shear Strength SMC 23°C (ASTM D1002), IPA/abrade/IPA
1,160 psi Overlap Shear Strength ABS 23°C (ASTM D1002), IPA/abrade/IPA
460 psi Overlap Shear Strength HIPS 23°C (ASTM D1002), IPA/abrade/IPA
Peel Strength Test Methods
Peel Strength Type Substrate Test Temperature Test Method
64 piw Floating Roller Peel Aluminum 23°C ASTM D3167
Chemical Resistance Test Methods
Chemical Resistance Test Method
1, 1, 1-Trichlorethane Solvent resistance was determined using cured (24 hrs RT + 2 hrs 160°F [71°C]) samples (1/2 in. x 4 in. x 1/8 in. thickness) immersed in the test solvent for 1 hour and 1 month. After the allowed period of time, the sample was removed and visually examined for surface attack as compared to the control.
Acetone
Freon TF
Freon TMC
Isopropyl Alcohol
RMA Flux
Dielectric Constant Test Methods
Dielectric Constant Temperature Test Method
5.90 23°C ASTM D 150, @ 1 KHz @ 23°C
Dielectric Strength Test Methods
Dielectric Strength Test Method
470 V/mil ASTM D 149
Dissipation Factor Test Methods
Dissipation Factor Temperature Test Method
0.12000 23°C ASTM D 150, @ 1 KHz @ 23°C
Volume Resistivity Test Methods
Volume Resistivity Test Method
2.6e12 (ohms/cm) ASTM D 257
Elongation Test Methods
Elongation Test Method
100 % Elongation is determined using 3M test method C-3094/ASTM D 882.
Shore D Hardness Test Methods
Shore D Hardness Shore Hardness Test Method
50 to 60 ASTM D 2240