• 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

    Chemical Resistance Chemical Resistance: Excellent solvent resistance, Chemical Resistance: Resistance to plasticizer migration
    Application Type Bond
    1 Part or 2 Part 1 Part
    Material Form Tape
    Substrate Acrylic paint, Aluminum, Ceramic, Glass, Metal, ABS, Polycarbonate, Polyester paint, Polyurethane paint, PVC, Enameled Steel, Stainless steel, Plasticized Vinyl, Galvanized Steel, Epoxy, Galvanized Steel, PBT, Foam, Nickel Coated ABS, A wide variety of plastics, Painted metals
    Industry Ideal for use in many interior bonding applications, Ideal for use in many exterior bonding applications, Rivets
    Manufacturer 3M
    Chemistry Acrylic
    Cure Method Pressure sensitive
    Color Gray
    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

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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.
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
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.
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
Dielectric Strength Test Methods
Dielectric Strength Test Method
360 V/mil ASTM D140
Dissipation Factor Test Methods
Dissipation Factor Test Method
0.02450 At 1 kHz, ASTM D150
0.03740 At 1MHz, ASTM D150
Surface Resistivity Test Methods
Surface Resistivity Test Method
2.7e14 (ohm/sq) ASTM D257
Volume Resistivity Test Methods
Volume Resistivity Test Method
2.1e14 (ohm-cm) ASTM D257
Modulus Test Methods
Modulus Temperature Test Method
3e5 (Pa) 25°C Shear modulus, 1 Hz