• Description for 3M PR Gel

    Designed to give exceptional performance on difficult-to-bond plastic and rubber substrates.

    *See Terms of Use Below

    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
    Chemical Resistance Excellent, Most oils
    Relative Solvent Resistance Chemical Resistance: Excellent Solvent resistance
    High Temperature Resistance (°C) 82
    Low Temperature Resistance (°C) -54
  • Technical Data for 3M PR Gel

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 1 Part
    • Material Form
      • Gel
    • Substrate
      • 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
      • Rubber
      • EPM/EPDM - EPDM
      • Composites - Composite
      • Paper
      • Other - Like substrates, Santoprene, Viton, Acidic surfaces, Leather
    • Industry
      • Other - Bonding poorly mating components, Vertical surfaces
    • Chemistry
    • Application Method
      • Other - Hand applied
    • Cure Method
      • Moisture
    • Color
      • Clear / Transparent - Clear
    Specifications
    Cure Specs
    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
    Bond Strength
    Shear Strength (psi) 2,900, 2,200, 3,100, 2,400, 1,050, 900, 1,750, 950, 1,100, 100 Test Method
    Material Resistance
    Chemical Resistance Excellent, Most oils
    Relative Solvent Resistance Chemical Resistance: Excellent Solvent resistance
    High Temperature Resistance (°C) 82
    Low Temperature Resistance (°C) -54
    Other Properties
    Specific Gravity 1.10 (g/ml)
    Business Information
    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

    *See Terms of Use Below

    1. 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.

      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).

    2. Application

      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.

    3. 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™ 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
Viscosity Test Method
Very high
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
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