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Description for 3M Scotch-Weld General Purpose Instant Adhesives EC40
A low viscosity cyanoacrylate that is fast curing. It is recommended for use on assemblies with close-fitting parts and smooth, even surfaces.<br/>Brand Scotch-Weld Chemical Resistance Oils, Chemical Resistance: solvents, excellent Application Type Bond 1 Part or 2 Part 1-Part Material Form Liquid Substrate Aluminum, Metals, Nylon, Most plastics, Rubbers, Steel, Stainless Steel Manufacturer 3M Chemistry Cyanoacrylate, Ethyl Cure Method Moisture Gap Fill (in) 0.004 Cure Time (min) Fast, 1,440 Viscosity (cPs) Low, 20 to 45 Color Clear High Temperature Resistance (°C) 82 Low Temperature Resistance (°C) -51 Key Specifications International Organization for Standardization -
Technical Data for 3M Scotch-Weld General Purpose Instant Adhesives EC40
Overview
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Chemical Resistance
- Chemical Resistance - Oils, excellent
- Chemical Resistance : Relative Solvent Resistance - solvents
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Application Type
- Adhesive - Bond
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1 Part or 2 Part
- 1-Part
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Material Form
- Liquid
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Industry
- Other - Close-fitting parts and smooth, even surfaces
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Chemistry
- Cyanoacrylate (CA) - Cyanoacrylate
- Other - Ethyl
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Application Method
- Other - Hand applied
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Cure Method
- Moisture / Condensation Cure - Moisture
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Color
- Clear / Transparent - Clear
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Key Specifications
- International Organization for Standardization
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Brand
- Scotch-weld
Specifications
Cure Specs
Gap Fill (in) 0.004 Cure Time (min) Fast, 1,440 Test Method Viscosity (cPs) Low, 20 to 45 Test Method Fixture or Handling Strength Time (min) <0.25 Test Method Bond Strength
General Bond Strength (psi) High Shear Strength (psi) 2,000, 2,400, 1,700, 1,000, 800, 1,200, 400, 800, 100 Test Method Material Resistance
High Temperature Resistance (°C) 82 Test Method Low Temperature Resistance (°C) -51 Test Method Other Properties
Specific Gravity 1.06 (g/ml) Test Method Business Information
Shelf Life Details For short term storage (<30 days), keep adhesive in a cool (60°F to 80°F [16°C to 27°C]), dry place out of direct sunlight. Keep containers tightly covered and free of moisture. Refrigeration (40°F [4°C]) gives optimum long term storage stability., 3M™ Scotch-Weld™ General Purpose Instant Adhesives can be expected to have a shelf life of one year from the date of shipment from 3M when stored under refrigerated conditions. Shelf Life Temperature (°F) 61 to 81 Shelf Life Type From the date of shipment Shelf Life (mon) 12 -
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Best Practices for 3M Scotch-Weld General Purpose Instant Adhesives EC40
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Surface Preparation
For optimum strength structural bonds, paint, oxide films, oils, dust, mold release agents, and all other surface contaminants must be completely removed. However, the amount of surface preparation depends on the required bond strength and the environmental aging resistance desired by the user. Typical quick surface preparation would include wiping with a clean solvent (such as isopropyl alcohol), abrading the surface with a clean fine abrasive, and then wiping again with a clean solvent to remove loose particles.
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Application
Ensure that parts are clean, dry, and free from oil and grease., An instant adhesive activator may be required if there are bonding gaps or porous substrate surfaces, if substrates are low surface energy plastics (e.g., polyethylene, polypropylene) or if substrates have acidic surfaces (e.g., paper, leather)., Bond speed is typically very fast so ensure that parts are properly aligned before dispensing., Product is normally hand applied from the bottle. Apply sparingly to one surface and press parts firmly together until handling strength is achieved. As a general rule, as little cyanoacrylate as possible should be used. Over application will result in slower cure speed and lower bond strength.
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Curing
Full bond strength will typically be achieved within a 24 hour cure time., Low humidity or low temperature conditions will slow down the cure rate., After curing, 3M™ Scotch-Weld™ General Purpose Instant Adhesive bonds are suitable for use up to about 180°F (82°C)., Cyanoacrylate bond resistance to most oils and solvents is excellent. Long term humidity, moisture, or water immersion may affect the strength of a cured cyanoacrylate bond depending on the substrates and the bond gap. Testing is recommended to evaluate the effect.
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Cure Time Test Methods
Cure Time | Test Method |
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Fast | |
1,440 min | Uncured |
Fixture or Handling Strength Time Test Methods
Fixture or Handling Strength Time | Fixture-Handling Strength Test Method |
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<0.25 min | Uncured, On EPDM. Time to handling is substrate dependent. |
Viscosity Test Methods
Viscosity | Test Method |
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Low | |
20 to 45 cPs | Uncured, Cone-Plate viscosity, CP75 at 3000/s shear rate |
Shear Strength Test Methods
Shear Strength | Type | Substrate | Test Method |
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2,000 psi | Overlap Shear Strength | Steel | Cured, ASTM D-1002, Grit blasted |
2,400 psi | Overlap Shear Strength | Stainless Steel | Cured, ASTM D-1002, Grit blasted |
1,700 psi | Overlap Shear Strength | Aluminum | Cured, ASTM D-1002, Grit blasted |
1,000 psi | Overlap Shear Strength | ABS | Cured, ATSM D-1002, Substrate failure |
800 psi | Overlap Shear Strength | Polycarbonate | Cured, ASTM D-1002, Substrate failure |
1,200 psi | Overlap Shear Strength | PVC | Cured, ASTM D-1002, Substrate Failure |
400 psi | Overlap Shear Strength | Nylon | Cured, ASTM D-1002, Substrate Failure |
800 psi | Overlap Shear Strength | Polypropylene | Cured, ASTM D-1002, Substrate Failure, Primed with AC77 |
100 psi | Overlap Shear Strength | Silicone Elastomers | Cured, ASTM D-1002, Substrate Failure, Primed with AC79 |
High Temperature Resistance Test Methods
High Temperature Resistance | Test Method |
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82°C | Cured |
Low Temperature Resistance Test Methods
Low Temperature Resistance | Test Method |
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-51°C | Cured |
Specific Gravity Test Methods
Specific Gravity | Test Method |
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1.06 (g/ml) | Uncured |

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