• Description for Henkel 681

    • Non-Corrosive - High Performance Magnet Bonding Adhesive • Vapors are Non-Corrosive to Copper Surfaces • Nonflammable • No Activator Required • Excellent Gap Filling Ability • High Shear, Peel, & Impact Strength • Rapid Room Temperature Cure • Fixtures Parts in 30 to 60 seconds • Environmentally Friendly – 100% Solids • 100% Cure Outside of Bondline •<br/>

    *See Terms of Use Below

    Brand Bondmaster
    Chemical Resistance Salt Spray
    Application Type Bond
    1 Part or 2 Part 2-Part
    Material Form Liquid
    Substrate Ferrite, Copper, Glass, Alnico, Steel, Neodymium iron boron, Epoxy-Coated Metal, Metals, Painted Metal, Samarian cobalt
    Industry Generators, Magnets, DC motors, Electric motors
    Manufacturer Henkel
    Chemistry Acrylic, Toughened
    Cure Method Part A/Part B
    Cure Temperature (°C) 20 to 25 Room Temperature, 20 to 25
    Cure Time (min) Rapid, 480
    Viscosity (cPs) 90,000, 13,500
    Color Dark Green
    High Temperature Resistance (°C) 155
    Low Temperature Resistance (°C) -65
  • Technical Data for Henkel 681

    • Chemical Resistance
      • Chemical Resistance - Salt Spray
    • Application Type
    • 1 Part or 2 Part
      • 2-Part
    • Material Form
      • Liquid
    • Substrate
      • Ceramic - Ferrite
      • Glass
      • Metal - Alnico, Epoxy-Coated Metal, Metals, Painted Metal, Samarian cobalt
      • Copper
      • Steel
      • Iron - Neodymium iron boron
      • Other - Rare earth
    • Industry
    • Chemistry
    • Cure Method
      • 2-Part Cure - Part A/Part B
    • Color
      • Green - Dark Green
    • Brand
      • Bondmaster
    Cure Specs
    Cure Temperature (°C) 20 to 25 Room Temperature, 20 to 25
    Cure Time (min) Rapid, 480
    Viscosity (cPs) 90,000, 13,500 Test Method
    Fixture or Handling Strength Time (min) 0.50 to 1.00 Test Method
    Work / Pot Time (min) 0.50 Test Method
    Thixotropic Thixotropic
    Mix Ratio 1:1 (by volume), 1:1 (by weight)
    Bond Strength
    Structural/Load-Bearing Structural
    Peel Strength (piw) High, 20 to 25 Test Method
    Shear Strength (psi) High, 3,000 to 3,500, 2,000, 250 Test Method
    Impact Strength (psi) High, 14 Test Method
    Material Resistance
    High Temperature Resistance (°C) 155
    Impact Resistance Impact resistance
    Low Temperature Resistance (°C) -65
    Moisture/Humidity Resistance Moisture/humidity resistance
    Shore D Hardness 70 to 75 Test Method
    Other Properties
    Specific Gravity 0.980
    Flash Point (°F) 260.6
    % Solids (%) 100
    Business Information
    Shelf Life Details Part A, Uncured, Part B, Uncured
    Shelf Life Temperature (°F) 77, 77
    Shelf Life (mon) 6, 6
  • Best Practices for Henkel 681

    *See Terms of Use Below

    1. Surface Preparation

      The 681 adhesive requires no surface preparation on most metal, ferrite, and glass surfaces. However, for optimum bond strength on metal parts the surface should be washed with a solvent or cleansing solution, abraded with an abrasive pad, and then rinsed with a solvent or cleansing solution. Glass surfaces should be cleaned with a commercial glass cleaner before bonding. Painted surfaces should be abraded lightly and then wiped clean.

    2. Application

      Bondmaster's Equipment Group, has a complete line of industrial dispensing equipment to dispense the 681 in magnet bonding applications. Equipment is available to dispense the adhesive through Bondmaster's unique External Mix dispensing process. The External Mix Dispensing System is a technology that results in high performance without the use of a static mixer. This allows the use of the adhesive in high-speed production without having to change static mixers frequently. The External Mix technology also provides the user with a higher performance than conventional bead-on-bead systems.

      In addition to standard equipment, Bondmaster offers custom dispensing equipment, designed for your specific application and production requirements. Contact your local Bondmaster sales representative for more equipment information.

    3. Mixing

      Five grams each of Bondmaster 681 Part A, Part B, and mixed adhesive were enclosed in a container with a conductive copper surface. The resistance of the copper surface was measured after a 24-hour and 240- hour exposure at temperatures of 50°C (122°F) and 150oC (302°F).

      Bondmaster 681 Part A & Part B should not be mixed in large quantities, as a vigorous chemical reaction will occur generating a significant amount of heat and vapors.

    4. Curing

      Exposure to air will inhibit the cure of all acrylic adhesives. Because of this inhibition, the exposed surface of any mixed adhesive squeezed outside the bondline will remain tacky for a few hours. Only the cure of the exposed surface is inhibited, not the adhesive in the bondline.

    5. Clean-Up

      Unreacted Part A & Part B can be cleaned up using acetone, isopropanol, or MEK.

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    *See Terms of Use Below

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Fixture or Handling Strength Time Test Methods
Fixture or Handling Strength Time Fixture-Handling Strength Time Temperature
0.50 to 1.00 min 25°C
Viscosity Test Methods
Viscosity Temperature
90,000 cPs 25°C
13,500 cPs 25°C
Work / Pot Time Test Methods
Work / Pot Time Temperature
0.50 min 25°C
Impact Strength Test Methods
Impact Strength Substrate Test Method
14 psi Steel/Steel ASTM 950
Peel Strength Test Methods
Peel Strength Substrate Test Method
20 to 25 piw Steel/Steel ASTM 1876
Shear Strength Test Methods
Shear Strength Substrate Test Method
High ASTM D1002
3,000 to 3,500 psi Steel/Steel ASTM D1002, Substrate failure
2,000 psi Ferrite/Steel ASTM D1002, Substrate failure
250 psi Glass/Glass
Shore D Hardness Test Methods
Shore D Hardness Hardness Temperature
70 to 75 25°C