3M PR Gel
Chemical Resistance Excellent, Chemical Resistance: Excellent Solvent resistance, Most oils Application Type Bond, Adhesive: Instant Adhesives 1 Part or 2 Part 1-Part Material Form Gel Substrate Composite, EPDM, Porous substrates, Polyethylene, Combination with metal, Paper, Difficult-to-bond plastic, Heavily plasticized PVC, Rubber, Low surface energy plastics Manufacturer 3M Chemistry Cyanoacrylate, Ethyl Hybrid Cure Method Moisture Cure Time (min) fast, 1,440 Viscosity (cPs) Very high, 50,000 to 90,000, 7,000 to 20,000, 100,000 to 150,000 Color Clear High Temperature Resistance (°C) 82 Low Temperature Resistance (°C) -54
Technical Data for 3M PR Gel
- Chemical Resistance - Excellent, Most oils
- Chemical Resistance : Relative Solvent Resistance - Excellent Solvent resistance
1 Part or 2 Part
- Porous Substrates
- Metal - Combination with metal
- Plastic - Difficult-to-bond plastic, Low surface energy plastics
- Polyethylene (LDPE, HDPE) - Polyethylene
- Polyvinyl chloride (PVC) - Heavily plasticized PVC
- EPM/EPDM - EPDM
- Composites - Composite
- Other - Like substrates, Santoprene, Viton, Acidic surfaces, Leather
- Other - Bonding poorly mating components, Vertical surfaces
- Cyanoacrylate (CA) - Cyanoacrylate
- Other - Ethyl Hybrid
- Other - Hand applied
- Moisture / Condensation Cure - Moisture
- Clear / Transparent - Clear
Cure Time (min) fast, 1,440 Viscosity (cPs) Very high, 50,000 to 90,000, 7,000 to 20,000, 100,000 to 150,000 Test Method Fixture or Handling Strength Time (min) 0.05 to 1.00, <0.42 Test Method
Shear Strength (psi) 2,900, 2,200, 3,100, 2,400, 1,050, 900, 1,750, 950, 1,100, 100 Test Method
High Temperature Resistance (°C) 82 Low Temperature Resistance (°C) -54
Specific Gravity 1.10 (g/ml)
Shelf Life Details Storage: 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™ Plastic and Rubber 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
Best Practices for 3M PR Gel
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.
Note: When using solvents, extinguish all ignition sources, including pilot lights, and follow the manufacturer’s precautions and directions for use.
Ensure that parts are clean, dry, and free from oil and grease.
A 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.
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™ Plastic and Rubber Instant Adhesive bonds are suitable for use up to about 180°F (82°C). At 180°F (82°C) the bonds will be approximately 70% of the strength at room temperature and at 212°F (100°C) about 50% of full strength.
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
Comparable Materials for 3M PR Gel
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Fixture or Handling Strength Time Test Methods
|Fixture or Handling Strength Time||Fixture-Handling Strength Test Method|
|0.05 to 1.00 min|
|<0.42 min||On EPDM. Time to handling is substrate dependent.|
Viscosity Test Methods
|50,000 to 90,000 cPs||Brookfield RVT, ‘T-spindle’ C @ 2.5 rpm|
|7,000 to 20,000 cPs||Brookfield RVT, ‘T-spindle’ C @ 20 rpm|
|100,000 to 150,000 cPs||Brookfield viscosity, Spindle TC @ 2.5 rpm;|
Shear Strength Test Methods
|Shear Strength||Type||Substrate||Test Method|
|2,900 psi||Overlap Shear Strength||ASTM D1002 (grit-blasted steel).|
|2,200 psi||Overlap Shear Strength||Steel||ASTM D-1002; Grit blasted|
|3,100 psi||Overlap Shear Strength||Stainless Steel||ASTM D-1002; Grit blasted|
|2,400 psi||Overlap Shear Strength||Aluminum||ASTM D-1002; Grit blasted|
|1,050 psi||Overlap Shear Strength||ABS||Substrate failure|
|900 psi||Overlap Shear Strength||Polycarbonate||ASTM D-1002; Substrate failure|
|1,750 psi||Overlap Shear Strength||PVC||ASTM D-1002; Substrate failure|
|950 psi||Overlap Shear Strength||Nylon||ASTM D-1002|
|1,100 psi||Overlap Shear Strength||Polypropylene||ASTM D-1002; Substrate failure; Primed with AC77|
|100 psi||Overlap Shear Strength||Silicone Elastomer||ASTM D-1002; Substrate failure; Primed with AC79|