Henkel 681

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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
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, Speakers, Electric motors, Generators, Magnets
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

Best Practices for Henkel 681

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Technical Data for Henkel 681

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Overview

Application Type
- Adhesive - Bond
1 Part or 2 Part
- 1 Part or 2 Part - 2 Part
- Part A Name - Part A
- Part B Name - Part B
Material Form
- Liquid
Substrate
- Ceramic - Ferrite
- Glass
- Metal - Alnico, Epoxy-Coated Metal, Metals, Painted Metal, Samarian cobalt
- Copper
- Iron - Neodymium iron boron
- Steel
- Other - Rare earth
Industry
- Electronics - Magnets, Speakers, Generators
- Speakers
- Industrial - Basket, Housings, Pole piece
- Motors - DC motors, Electric motors
- Construction - Frames
Chemistry
- Toughened
- Acrylic
Cure Method
- 2-Part Cure - Part A/Part B
Color
- Green - Dark Green
Brand
- Bondmaster

Specifications

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

Chemical Resistance	Salt Spray
High Temperature Resistance (°C)	155
Low Temperature Resistance (°C)	-65
Impact Resistance	Impact resistance
Moisture/Humidity Resistance	Moisture/humidity resistance

Hardness

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.
Comparable Materials for Henkel 681

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Spec Engine^® Results
- 675(Henkel)
  • Rapid Curing Structural Acrylic Adhesive • Excellent Gap Filling Ability • Environmentally Friendly (100% Solids) • Excellent Durability • No Activator Required • Easily Automated with Dispensing Equipment • Rapid Room Temperature Cure • High Shear, Peel, & Impact Strength • Minimal Surface Preparation Required•
- 661(Henkel)
  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.
- 663(Henkel)
  • Rapid Cure Structural Adhesive System • Excellent Gap Filling Ability • Environmentally Friendly (100% Solids) • Excellent Durability • No Activator Required • Easily Automated with Dispensing Equipment • Rapid Room Temperature Cure • High Shear, Peel, & Impact Strength • Minimal Surface Preparation Required
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