Brand Bondmaster Application Type Bond 1 Part or 2 Part 2 Part Material Form Liquid Substrate Copper, Glass, Alnico, Ferrite, Neodymium iron boron, Steel, Epoxy-Coated Metal, Metals, Painted Metal, Samarian cobalt Industry DC motors, Magnets, Generators, 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 Chemical Resistance Salt Spray High Temperature Resistance (°C) 155 Low Temperature Resistance (°C) -65
Technical Data for Henkel 681
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)
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
Chemical Resistance Salt Spray High Temperature Resistance (°C) 155 Low Temperature Resistance (°C) -65 Impact Resistance Impact resistance Moisture/Humidity Resistance Moisture/humidity resistance
Shore D Hardness 70 to 75 Test Method
Specific Gravity 0.980 Flash Point (°F) 260.6 % Solids (%) 100
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
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.
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.
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.
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.
Unreacted Part A & Part B can be cleaned up using acetone, isopropanol, or MEK.
Comparable Materials for Henkel 681
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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
Work / Pot Time Test Methods
|Work / Pot Time||Temperature|
Shear Strength Test Methods
|Shear Strength||Substrate||Test Method|
|3,000 to 3,500 psi||Steel/Steel||ASTM D1002, Substrate failure|
|2,000 psi||Ferrite/Steel||ASTM D1002, Substrate failure|
Peel Strength Test Methods
|Peel Strength||Substrate||Test Method|
|20 to 25 piw||Steel/Steel||ASTM 1876|
Impact Strength Test Methods
|Impact Strength||Substrate||Test Method|
|14 psi||Steel/Steel||ASTM 950|
Shore D Hardness Test Methods
|Shore D Hardness||Hardness Temperature|
|70 to 75||25°C|