Henkel 661

Henkel 661 Datasheet
  • 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 Acrylic, Phenolic, Glass, Metals, Ferrite, Neodymium iron boron, Zinc Dichromate, ABS, Polycarbonate, PVC, Galvanized Steel, Steel, Stainless Steel, Aluminum, Galvanized Steel, Alnico, Zinc Plated, Rigid Plastics, Zinc plated Steel, Epoxy-Coated Metal, Zinc plated Steel, Painted Metal, Samarian cobalt
    Industry DC motors, Speakers, Automotive, Marine, Electrical, Magnet, Generators
    Manufacturer Henkel
    Chemistry Acrylic, Toughened
    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
    Durability Excellent Durability
  • Technical Data for Henkel 661

    Overview
    Specifications
    Cure Specs
    Cure Temperature (°C) 20 to 25, 20 to 25
    Cure Time (min) Rapid, 60
    Viscosity (cPs) 8,500 Test Method
    Fixture or Handling Strength Time (min) 0.75 to 1.50 Test Method
    Work / Pot Time (min) 0.50 Test Method
    Mix Ratio 1:1 (by volume), 1:1 (by weight)
    Bond Strength
    Structural/Load-Bearing Structural
    Peel Strength (piw) High, 10 to 20 (pli) Test Method
    Shear Strength (psi) High, 2,500 to 3,000, 2,000 to 2,800, 1,500 to 2,500, 2,500 to 3,000, 2,000 to 2,800, 2,000, 2,000, 2,000, 2,000, 250, 300 to 400, 300 to 400, 50 to 100, 80 to 120, 200 to 300 Test Method
    Impact Strength (psi) High, 8 to 10 (ft-lb / in2) Test Method
    Material Resistance
    Chemical Resistance Acetone, Diesel Fuel, Gasoline, Isopropyl Alcohol, Salt Spray
    High Temperature Resistance (°C) 155
    Low Temperature Resistance (°C) -65
    Impact Resistance Impact resistance
    Moisture/Humidity Resistance Moisture/humidity resistance
    Hardness
    Durability Excellent Durability
    Shore D Hardness 60 to 65, 55 to 60, 40 to 45 Test Method
    Other Properties
    Glass Transition Temp (Tg) (°C) 57
    Specific Gravity 0.965
    Flash Point (°F) 201.2
    % Solids (%) 100
    Business Information
    Shelf Life Details Shelf life Part A, Package sizes larger than 2000ml six months. , Shelf life Part B, Package sizes larger than 2000ml six months. , Shelf life Mix, BONDMASTER 661 has a shelf life of one year when stored in a refrigerator. Keep away from excessive heat, sparks, flame, and sunlight.
    Shelf Life Temperature (°F) 36 to 45, 36 to 45
    Shelf Life (mon) 12, 12, 12
    Not Good For
    Don't Use With Delrin, Polyethylene, Polypropylene, Polyurethane, Any type of elastomer, Acetal
  • Best Practices for Henkel 661

    *See Terms of Use Below

    1. Surface Preparation

      Minimal Surface Preparation Required.

      The 661 adhesive requires no surface preparation on most metal, ferrite, and glass surfaces. 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 661 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.

    3. Mixing

      For optimum performance, 661 should be mixed in a 1:1 (A:B) ratio. However, the adhesive has a very forgiving mix ratio, and complete cure can be achieved even when the adhesive is not mixed exactly in a one to one ratio.

      BONDMASTER 661 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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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
High
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
High
10 to 20 (pli) T-Peel strength Steel/Steel ASTM 1876
Impact Strength Test Methods
Impact Strength Substrate Test Method
High
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