• Description for 3M 4991

    • Gray, closed-cell acrylic foam carrier • Conformable • Good adhesion to many painted metals • Plasticizer resistant • UL 746C

    *See Terms of Use Below

    Application Type Bond
    1 Part or 2 Part 1 Part
    Material Form Tape
    Substrate Plastic: Acrylic paint, Ceramic, Plastic: Epoxy, Glass, Metal, Stainless steel, ABS, Plasticized Vinyl, A wide variety of plastics, Polycarbonate, Polyester paint, Polyurethane paint, PVC, Enameled Steel, Steel: Galvanized Steel, Aluminum, Nickel Coated ABS, Painted metals
    Manufacturer 3M
    Chemistry Acrylic
    Cure Method Pressure sensitive
    Color Gray
    Chemical Resistance Resistance to plasticizer migration
    Relative Solvent Resistance Chemical Resistance: Excellent solvent resistance
    High Temperature Resistance (°C) 93, 121, 90, Outstanding durability
    Low Temperature Resistance (°C) -35, Outstanding durability
    Density (g/cm³) 0.720
    Key Specifications UL746C Listings - File MH 17478
  • Technical Data

    Overview
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    Specifications
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  • Best Practices

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Shear Strength Test Methods
Shear Strength Type Cure Time Substrate Test Time Test Temperature Test Method
High
65 psi Dynamic overlap shear strength 4,320 min Stainless steel 25°C ASTM D-1002 - To stainless steel, room temperature, 1 in2 (6.45 cm2), jaw speed 0.5 in/min (12.7 mm/min.) Peak force to separate is measured. 72 hour dwell.
1000 (grams) Static shear strength Stainless steel 600,000 sec 22°C ASTM D3654 - To stainless steel, tested at various temperatures and gram loadings. 0.5 in2 (3.22 cm2). Will hold listed weight for 10,000 minutes (approximately 7 days). Conversion: 1500 g/0.5 in2 equals 6.6 lb/in2, 500 g/0.5 in2 = 2.2 lb/in2.
500 (grams) Static shear strength Stainless steel 600,000 sec 66°C ASTM D3654 - To stainless steel, tested at various temperatures and gram loadings. 0.5 in2 (3.22 cm2). Will hold listed weight for 10,000 minutes (approximately 7 days). Conversion: 1500 g/0.5 in2 equals 6.6 lb/in2, 500 g/0.5 in2 = 2.2 lb/in2.
500 (grams) Static shear strength Stainless steel 600,000 sec 93°C ASTM D3654 - To stainless steel, tested at various temperatures and gram loadings. 0.5 in2 (3.22 cm2). Will hold listed weight for 10,000 minutes (approximately 7 days). Conversion: 1500 g/0.5 in2 equals 6.6 lb/in2, 500 g/0.5 in2 = 2.2 lb/in2.
Tensile Strength Test Methods
Tensile Strength Cure Time Substrate Test Temperature Test Method
High
70 psi 4,320 min Aluminum 25°C ASTM D-897 - To aluminum, room temperature, 1 in2 (6.45 cm2), jaw speed 2 in/min (50 mm/min.) Peak force to separate is measured. 72 hour dwell
Peel Strength Test Methods
Peel Strength Type Cure Time Substrate Test Temperature Test Method
High
22 (lb/in) 90° Peel strength 4,320 min Stainless steel 25°C Based on ASTM D3330 -To stainless steel, room temperature, jaw speed 12 in/min (305 mm/min). Average force to remove is measured. 72 hour dwell.
High Temperature Resistance Test Methods
High Temperature Resistance Test Method
93°C Long Term Temperature Tolerance - Maximum temperature where tape supports at least 250 g load per 0.5 in2 in static shear for 10,000 minutes. (Represents continuous exposure for days or weeks).
121°C Short Term Temperature Tolerance - No change in room temperature dynamic shear properties following 4 hours conditioning at indicated temperature with 100 g/static load. (Represents minutes, hours in a process type temperature exposure).
90°C
Outstanding durability
Dielectric Constant Test Methods
Dielectric Constant Test Method
2.29 at 1 kHz, ASTM D150
1.99 at 1MHz, ASTM D150
Dissipation Factor Test Methods
Dissipation Factor Test Method
0.02450 at 1 kHz, ASTM D150
0.03740 at 1MHz, ASTM D150
Dielectric Strength Test Methods
Dielectric Strength Test Method
360 V/mil ASTM D140
Volume Resistivity Test Methods
Volume Resistivity Test Method
2.1e14 (ohm-cm) ASTM D257
Surface Resistivity Test Methods
Surface Resistivity Test Method
2.7e14 (ohm/sq) ASTM D257
Modulus Test Methods
Modulus Temperature Test Method
3e5 (Pa) 25°C Shear modulus, 1 Hz