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3M 4991
3M VHB™ 90mil Gray Conformable Acrylic Foam

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

Adhesion to Steel
180° Peel		 adhesion to steel 180° peel - liner side Tensile Strength Elongation Percent
    60.00 lbs/in  

Min Application
Temp		 Min Service
Temp		 Max Short-Term
Temp		 Max Long-Term
Temp
60 °F -40 °F 250 °F 200 °F
Adhesive Tape Features
  • 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
  • 4991 is appropriate for applications, which demand a thicker conformable product
  • It has a Plasticizer Resistant adhesive
  • Solvent resistant
Adhesive Tape 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
Adhesive Tape Markets Served
Adhesive Tape Colors
  • Gray

Comparable products

3M 4991 View Datasheet
3M VHB™ 90mil Gray Conformable Acrylic Foam
Backing Adhesive Thickness Adhesion
 Acrylic Foam   Acrylic   90.00mil   oz/in 

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