3M 4956

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Description for 3M 4956

• 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	Acrylic paint, Ceramic, Epoxy, Foam, PBT, Glass, Metal, ABS, Plasticized Vinyl, Polycarbonate, Polyester paint, Polyurethane paint, PVC, Enameled Steel, Galvanized Steel, Galvanized Steel, Stainless steel, Nickel Coated ABS, A wide variety of plastics, Painted Metals
Industry	Rivets, Ideal for use in many interior bonding applications, Ideal for use in many exterior bonding applications
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)	110, 75, 90, High, Outstanding durability
Low Temperature Resistance (°C)	-35, Outstanding durability
Density (g/cm³)	0.720
Key Specifications	UL746C Listings - File MH 17478

Best Practices for 3M 4956

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Technical Data for 3M 4956

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Overview

Application Type
- Adhesive - Bond
1 Part or 2 Part
- 1 Part or 2 Part - 1 Part
Material Form
- Tape
Substrate
- Ceramic
- Foam
- Glass
- Metal - Stainless steel, Painted Metals
- Steel - Enameled Steel
- Galvanized - Galvanized Steel
- Plastic - ABS, Nickel Coated ABS, A wide variety of plastics
- Acrylic (PMMA) - Acrylic paint
- Epoxy
- Vinyl - Plasticized Vinyl
- Polycarbonate
- Polyurethane - Polyurethane paint
- Polyvinyl chloride (PVC) - PVC
- Polyester - Polyester paint
- Polybutylene Terephthalate (PBT) - PBT
- Galvanized Steel
- Other - Paint, High and medium surface energy substrates
Industry
- Rivet - Rivets
- Interior - Ideal for use in many interior bonding applications
- Industrial - Other permanent fasteners, Foils, Spot Welds
- Industrial Exterior - Ideal for use in many exterior bonding applications
- Construction
Chemistry
- Acrylic
Application Method
- Contact
Cure Method
- Pressure Sensitive (min) - Pressure sensitive
Color
- Gray
Key Specifications
- UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association) - UL746C Listings - File MH 17478

Specifications

Cure Specs

Application Temperature (°F)	70 to 100

Bond Strength

General Bond Strength (psi)	Good
Peel Strength (piw)	High
Shear Strength (psi)	High
Tensile Strength (psi)	High

Material Resistance

Chemical Resistance	Resistance to plasticizer migration
Relative Solvent Resistance	Chemical Resistance: Excellent solvent resistance
High Temperature Resistance (°C)	110, 75, 90, High, Outstanding durability
Low Temperature Resistance (°C)	-35, Outstanding durability
Moisture/Humidity Resistance	Excellent

Conductivity

Dissipation Factor	0.02450, 0.37400	Test Method
Dielectric Strength (V/mil)	360	Test Method
Dielectric Constant	2.29, 1.99	Test Method
Thermal Conductivity (W/m°K)	0.08
Volume Resistivity (O)	2.1e14 (ohm-cm)	Test Method
Surface Resistivity (O)	2.7e14 (ohm/sq)	Test Method

Hardness

Flexibility	Conformability
Modulus (psi)	3e5 (Pa)	Test Method

Other Properties

Coefficient of Thermal Expansion (CTE)	180e-6 (m/m/°C)
Density (g/cm³)	0.720

Business Information

Shelf Life Details	All 3M™ VHB™ Tapes have a shelf life of 24 months from date of shipment 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)	40 to 100
Shelf Life Type	From date of shipment
Shelf Life (mon)	24

Best Practices for 3M 4956

*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.
  
  Exceptions to the general procedure that may require additional surface preparation include: Heavy Oils: A degreaser or solvent-based cleaner may be required to remove heavy oil or grease from a surface and should be followed by cleaning with IPA/water.
  
  Abrasion: Abrading a surface, followed by cleaning with IPA/water, can remove heavy dirt or oxidation and can increase surface area to improve adhesion.
  
  Adhesion Promoters: Priming a surface can significantly improve initial and ultimate adhesion to many materials such as plastics and paints.
  
  Porous surfaces: Most porous and fibered materials such as wood, particleboard, concrete, etc. need to be sealed to provide a unified surface.
  
  Unique Materials: Special surface preparation may be needed for glass and glass-like materials, copper and copper containing metals, and plastics or rubber that contain components that migrate (e.g. plasticizers).
  
  Refer to 3M Technical Bulletin “Surface Preparation for 3M™ VHB™ Tape Applications” for additional details and suggestions. (70-0704-8701-5)
  
  *Note: These cleaner solutions contain greater than 250 g/l of volatile organic compounds (VOC). Please consult your local Air Quality Regulations to be sure the cleaner is compliant. When using solvents, be sure to follow the manufacturer’s precautions and directions for use when handling such materials.
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:60°F (15°C): 3M™ VHB™ Tapes 4941, 4945 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.
Comparable Materials for 3M 4956

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Spec Engine^® Results
- 4956F(3M)
  • Gray, closed-cell acrylic foam carrier • Conformable • Good adhesion to many painted metals • Plasticizer resistant • UL 746C
- 4941(3M)
  • Gray, closed-cell acrylic foam carrier • Conformable • Good adhesion to many painted metals • Plasticizer resistant • UL 746C
- 4941F(3M)
  • Gray, closed-cell acrylic foam carrier • Conformable • Good adhesion to many painted metals • Plasticizer resistant • UL 746C
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