4991 - VHB™ Acrylic Foam Tape

3M

E-Mail this datasheet

FEATURES

Std Roll Length: 36.00 yards
Gray closed-cell foam carrier
Density is 45lb./cubic ft.
5 mil red polyethylene film liner
Static shear at 72°F 1/2 sq. in. holds 1,000 grams over 10,000 minutes

ADVANTAGES

4991 is appropriate for applications, which demand a thicker conformable product
It has a Plasticizer Resistant adhesive
Solvent resistant

APPLICATIONS

Bond muntin bars to windows
Bond & seal polycarbonate lens over LCD
Bond pre-painted metals in truck assembly
Mount vinyl wiring ducts and conduit channels
Bond & seal plastic windows to pre-painted control panels/switch gear
Replace rivets
Bonding a variety of substrates, including most metal, sealed wood and glass, as well as many plastics, composites and painted surfaces

MARKETS SERVED

Construction
Window
Truck & Trailer body
Metal sheds
Electrical
Electronics

COLORS

Gray

GENERAL INFORMATION

3M 4991 is a 90 mil, VHB™, double-coated, conformable acrylic foam. 4991 is the main product when conformability is necessary. 4991 utilizes multi-purpose acrylic adhesive on both sides of a conformable foam. It has excellent adhesion to a broad range of high and medium surface energy substrates including metals, glass and a wide variety of plastics and plasticized vinyl. In many cases 4991 can replace rivets, spot welds, liquid adhesives or other permanent fasteners.

PRODUCT CONSTRUCTION

	Type	Mil Thickness

Backing	Acrylic Foam
Adhesive (unwind)	Acrylic
Adhesive (liner)	Acrylic
Liner Type (outer)	PE - Polyethylene (5 mil red)
Foam Cell Type	Closed
Thickness (total)		90.00

PRIMARY PHYSICAL PROPERTIES

	Unwind Side	Liner Side

Adhesion-to-Steel - 90° Peel	320.00 oz/in	320.00 oz/in
Adhesion Dynamic Shear	1040 oz/in	1040 oz/in
Adhesive Activation	Pressure
Tensile Strength	60.00 lbs/in
Testing Info: 90 degree peel: ASTM D3330; Tensile: ASTM D-897; Dynamic overlap shear ASTM D-1002

SECONDARY PHYSICAL PROPERTIES

Water Resistant	Yes
UV Resistant	Yes
Solvent Resistant	Yes
Plasticizer Resistant	Yes

THERMAL / ELECTRICAL PROPERTIES

Minimum Application Temperature	60°F
Minimum Service Temperature	-40°F
Maximum Long-Term Temperature	200°F
Maximum Short-Term Temperature	250°F

The physical properties listed are typical values and are not to be considered as specifications. Our suggestions for use are based on tests we believe to be reliable. However, the purchaser must carry out their own tests to determine the suitability of the product for their internal use. Information is given in good faith, but without warranty.
It is essential, as with all pressure-sensitive tapes, that the surface to which the tape is applied be clean, dry and free of grease and oil.
Shelf life from date of manufacture is based on the product being stored at 70°F(21°C) / 50% relative humidity out of direct sunlight.
Specification compliance is dynamic and should only be used as a general guide. Always confirm that the tape you are interested in currently complies with all specification requirements. Please verify that the product number that you select is available in the proper size and color to meet your specification.