• Description for Henkel 661

    A two-part, rapid, room temperature cure, toughened acrylic adhesive that combines ease of use with a high level of performance. The cured adhesive provides a combination of high shear and impact strength with excellent durability.

    *See Terms of Use Below

    Brand Bondmaster
    Application Type Bond
    1 Part or 2 Part 2 Part
    Material Form Liquid
    Substrate Plastic: Acrylic, Plastic: Phenolic, Glass, Metals, Ferrite, Metal: Neodymium iron boron, Metal: Zinc Dichromate, ABS, Polycarbonate, PVC, Steel: Galvanized Steel, Steel, Stainless Steel, Aluminum, Alnico, Metal: Zinc Plated, Rigid Plastics, Zinc plated Steel, Epoxy-Coated Metal, Metal: Zinc plated Steel, Painted Metal, Samarian cobalt
    Industry DC motors, Transportation: Automotive, Transportation: Marine, Electrical, Magnet, Speakers, Generators
    Manufacturer Henkel
    Chemistry Acrylic
    Cure Method Part A/Part B
    Cure Temperature (°C) 20 to 25, 20 to 25
    Cure Time (min) Rapid, 60
    Viscosity (cPs) 8,500
    Color Dark Green
    Chemical Resistance Acetone, Diesel Fuel, Gasoline, Isopropyl Alcohol, Salt Spray
    High Temperature Resistance (°C) 155
    Low Temperature Resistance (°C) -65
  • Technical Data

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  • Best Practices

    *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
0.75 to 1.50 min 25°C
Viscosity Test Methods
Viscosity Test Method Temperature
8,500 cPs Viscosity, Brookfield, 25oC 77°F @ 20 rpm 25°C
Work / Pot Time Test Methods
Work / Pot Time Temperature
0.50 min 25°C
Shear Strength Test Methods
Shear Strength Type Substrate Test Temperature Test Method
2,500 to 3,000 psi Lap shear strength Steel/Steel 25°C ASTM D-1002
2,000 to 2,800 psi Lap shear strength Aluminum/Aluminum 25°C ASTM D-1002
1,500 to 2,500 psi Lap shear strength Galvanized steel/Galvanized steel 25°C ASTM D-1002
2,500 to 3,000 psi Lap shear strength Stainless Steel/Stainless Steel 25°C ASTM D-1002
2,000 to 2,800 psi Lap shear strength Zinc plated steel/Zinc plated steel 25°C ASTM D1002
2,000 psi Lap shear strength Ferrite/Steel 25°C ASTM D-1002, Substrate Failure
2,000 psi Lap shear strength Ferrite/Zinc Dichromate 25°C ASTM D-1002, Substrate Failure
2,000 psi Lap shear strength Ferrite/Galvanized Steel 25°C ASTM D-1002, Substrate Failure
2,000 psi Lap shear strength Ferrite/Zinc plated 25°C ASTM D-1002, Substrate Failure
250 psi Lap shear strength Glass/Glass 25°C ASTM D1002, Substrate Failure
300 to 400 psi Lap shear strength Phenolic/Phenolic 25°C ASTM D1002
300 to 400 psi Lap shear strength PVC/PVC 25°C ASTM D1002
50 to 100 psi Lap shear strength Polycarbonate/Polycarbonate 25°C ASTM D1002
80 to 120 psi Lap shear strength ABS/ABS 25°C ASTM D1002
200 to 300 psi Lap shear strength Acrylic/Acrylic 25°C ASTM D1002
Peel Strength Test Methods
Peel Strength Type Substrate Test Method
10 to 20 (pli) T-Peel strength Steel/Steel ASTM 1876
Impact Strength Test Methods
Impact Strength Substrate Test Method
8 to 10 (ft-lb / in2) Steel/Steel ASTM 950
Shore D Hardness Test Methods
Shore D Hardness Hardness Temperature
60 to 65 25°C
55 to 60 50°C
40 to 45 100°C