• Description for 3M 4950

    • White, closed-cell acrylic foam carrier • used on high surface energy plastic substrates • Apply as low as 50°F (10°C) • UL 746C

    *See Terms of Use Below

    Application Type Bond
    1 Part or 2 Part 1 Part
    Material Form Tape
    Substrate Aluminum, Acrylic, Ceramic, Epoxy, Foam, PBT, Glass, Metal, ABS, Polycarbonate, Rigid PVC, Enameled Steel, Galvanized Steel, Stainless Steel, Galvanized Steel, Plastic, Steel, High surface energy plastic
    Industry Many interior bonding applications, Many exterior bonding applications
    Manufacturer 3M
    Chemistry Acrylic
    Cure Method Pressure sensitive
    Color Black, White
    Chemical Resistance Ammonia cleaner, Gasoline, JP-4 jet fuel, Methyl ethyl ketone, Mineral spirits, Motor oil
    Relative Solvent Resistance Chemical Resistance: Acetone, Chemical Resistance: Excellent solvent resistance
    High Temperature Resistance (°C) 110, 75, 90, 93, 149
    Low Temperature Resistance (°C) -35
    Density (g/cm³) 0.800
    Key Specifications UL746C
  • Technical Data for 3M 4950

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 1 Part
    • Material Form
      • Tape
    • Substrate
    • Industry
      • Interior - Many interior bonding applications
      • Industrial Exterior - Many exterior bonding applications
    • Chemistry
    • Application Method
      • Dispenser - Application equipment
      • Roll - Roller
      • Flow - Flow equipment, Pumping
    • Cure Method
      • Pressure Sensitive (min) - Pressure sensitive
    • Color
      • Black
      • White
    • Key Specifications
      • UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association) - UL746C
    Specifications
    Cure Specs
    Application Temperature (°F) 50, 70 to 100
    Bond Strength
    Peel Strength (piw) High, 25 (lb/in) Test Method
    Shear Strength (psi) High, 80, 1500 (grams), 1000 (grams), 500 (grams) Test Method
    Tensile Strength (psi) High, 140 Test Method
    Material Resistance
    Chemical Resistance Ammonia cleaner, Gasoline, JP-4 jet fuel, Methyl ethyl ketone, Mineral spirits, Motor oil
    Relative Solvent Resistance Chemical Resistance: Acetone, Chemical Resistance: Excellent solvent resistance
    Relative Solvent Resistance Chemical Resistance: Acetone, Chemical Resistance: Excellent solvent resistance
    High Temperature Resistance (°C) 110, 75, 90, 93, 149 Test Method
    Low Temperature Resistance (°C) -35
    Moisture/Humidity Resistance Excellent
    Conductivity
    Dissipation Factor 0.02270, 0.03700 Test Method
    Dielectric Strength (V/mil) 630 Test Method
    Dielectric Constant 2.28, 1.99 Test Method
    Thermal Conductivity (W/m°K) 0.09 Test Method
    Surface Resistivity (O) >e16 (ohms/sq.)
    Volume Resistivity (O) 1.5e15 (ohms/cm) Test Method
    Hardness
    Flexibility Firm
    Modulus (psi) 6e5 (Pa) Test Method
    Other Properties
    Coefficient of Thermal Expansion (CTE) 1e-4 (in./ in/°F), 1.8e-4 (mm/mm /°C)
    Density (g/cm³) 0.800
    Business Information
    Shelf Life Details All 3M™ VHB™ Tapes have a shelf life of 24 months from date of manufacture when stored at 40°F to 100°F (4°C to 38°C) and 0-95% relative humidity. The optimum storage conditions are 72°F (22°C) and 50% relative humidity. Performance of tapes is not projected to change even after shelf life expires, however, 3M does suggest that 3M™ VHB™ Tapes are used prior to the shelf life date whenever possible.
    Shelf Life Temperature (°F) 39 to 100
    Shelf Life Type From date of manufacture
    Shelf Life (mon) 24
  • Best Practices for 3M 4950

    *See Terms of Use Below

    1. Surface Preparation

      Most substrates are best prepared by cleaning with a 50:50 mixture of isopropyl alcohol (IPA*) and water prior to applying 3M™ VHB™ Tapes.

      See Vendor Technical Data Sheet for more info.

      To obtain good performance with all 3M™ VHB™ Tapes, it is important to ensure that the surfaces are dry and free of condensed moisture.

    2. Application

      Bond strength is dependent upon the amount of adhesive-to-surface contact developed. Firm application pressure develops better adhesive contact and helps improve bond strength. Typically, good surface contact can be attained by applying enough pressure to insure that the tape experiences approximately 15 psi (100 kPa) pressure. Either roller or platen pressure can be used. Note that rigid surfaces may require 2 or 3 times that much pressure to make the tape experience 15 psi.

      Ideal application temperature range is 70°F to 100°F (21°C to 38°C). Pressure sensitive adhesives use viscous flow to achieve substrate contact area. Minimum suggested application temperatures:50°F (10°C): 3M™ VHB™ Tapes 4950, 5952, 4910, 4952, 4611, 4622 families.

      Note: Initial tape application to surfaces at temperatures below these suggested minimums is not recommended because the adhesive becomes too firm to adhere readily. However, once properly applied, low temperature holding is generally satisfactory.

    3. Curing

      After application, the bond strength will increase as the adhesive flows onto the surface (also referred to as “wet out”). At room temperature approximately 50% of ultimate bond strength will be achieved after 20 minutes, 90% after 24 hours and 100% after 72 hours. This flow is faster at higher temperatures and slower at lower temperatures. Ultimate bond strength can be achieved more quickly (and in some cases bond strength can be increased) by exposure of the bond to elevated temperatures (e.g. 150°F [66°C] for 1 hour). This can provide better adhesive wetout onto the substrates. Abrasion of the surfaces or the use of primers/ adhesion promoters can also have the effect of increasing bond strength and achieving ultimate bond strength more quickly.

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    *See Terms of Use Below

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Shear Strength Test Methods
Shear Strength Type Cure Time Substrate Test Time Test Temperature Test Method
High
80 psi Dynamic Overlap Shear Strength 4,320 min Stainless Steel 25°C Room Temperature 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.
1500 (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.
1000 (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
140 psi 4,320 min Aluminum 25°C Room Temperature 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
25 (lb/in) 90° Peel Strength 4,320 min Stainless Steel 25°C Room Temperature 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
110°C
75°C
90°C
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)
149°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).
Dielectric Constant Test Methods
Dielectric Constant Test Method
2.28 ASTM D150, 1 KHz
1.99 ASTM D150, 1 MHz
Dielectric Strength Test Methods
Dielectric Strength Test Method
630 V/mil ASTM D149
Dissipation Factor Test Methods
Dissipation Factor Test Method
0.02270 ASTM D150, 1 KHZ
0.03700 ASTM D150, 1 MHZ
Thermal Conductivity Test Methods
Thermal Conductivity Test Method
0.09 W/m°K K-Value
Volume Resistivity Test Methods
Volume Resistivity Test Method
1.5e15 (ohms/cm) ASTM D257
Modulus Test Methods
Modulus Temperature Test Method
6e5 (Pa) 25°C Shear modulus, 1 Hz