This auction is for 10 pieces size 18mmx24mm 3M VHB 4991 Double Sided Tape

  • Brand: 3M
  • Model: 4991
  • VHB:Very High Bond Adhesive Fastener
  • Size: 18mmx24mm
  • Color: Grey
  • Thickness:2.3mm
  • Temperature Resistanc: Minutes Hours  300°F(149°C) / Days Weeks 200°F(93°C)


3M VHB（Very High Bond）Conformable Tape 

Can instead of rivets, screws and other mechanical fixation.

3M VHB double-sided tape have the comprehensive structure of acrylic, not only can seal off moisture and most solvents, 

but also long-term resistance to uv radiation, hot and cold cycle.Unique foam can be as excellent cushioning material. 

.Unlike mechanical fixed point force, VHB tape can average dispersion force, so the user can use the thin material and no deformation, metal fatigu.

4991

This tape belongs to 4941 family.

This family utilizes multi-purpose acrylic adhesive on both sides of conformable foam. The adhesive provides

excellent adhesion to a broad range of high and medium surface energy substrates including metals, glass, and a

wide variety of plastics, as well as plasticized vinyl. The conformable foam provides good contact, even with

mismatched substrates.

Description

  • Gray, closed-cell acrylic foam carrier. 
  • Conformable.
  • Good adhesion to many painted metals. 
  • Plasticizer resistant. UL 746C.

Adhesive Type: Multi-Purpose Acrylic

Foam Type: Conformable

Tape Thickness w/o liner : 90mils(2.3mm)

Temperature Resistance

       Minutes Hours： 300°F(149°C)

       Days Weeks： 200°F(93°C)

Solvent Resistance: High

Relative Adhesion

       HSE： High

       LSE： Med

Application Ideas

       Bond muntin bars to windows.

       Bond and seal polycarbonate lens over LCD.

       Bond pre-painted metals in truck assembly.

       Bond and seal plastic windows to pre-painted control panels/switch gear.

       Mount vinyl wiring ducts and conduit channels.

Liner Type: D

       Liner Types:

       A – 3 mil 54# Densified Kraft Paper

       B – 5 mil Clear Polyethylene Film

       C – 2 mil Polyester Film

       D – 5 mil Red Polyethylene Film

       E – 4 mil 58# Polycoated Kraft Paper

       Relative Adhesion:

       HSE – High Surface Energy

       LSE – Low Surface Energy

 

How to use this tape?


Clean:For maximum bond strength,the surface must be clean, dry, smooth, have no rust and oil pollution.Typical cleaning solvents are heptane or isopropyl alcohol.

Pressure: Pressure on the adhesive and the surface can help improve bond strength,roller or platen can be used.

Time: After application, the bond strength will increase as the adhesive flows onto the surface. At room temperature approximately 50% of ultimate bond  strength will be achieved after 20 minutes, 90% after 24 hoursand 100% after 72 hours.

Temperature:Ideal application temperature range is 70°F to 100°F (21degree centigrade to 38degree centigrade).Operating temperature should not be below 10 degree centigrade, the temperature is too low, will lead to cure time longer. If temperature is too low, move material and adhesive tape into the warm indoor storage or heating treatment.


Q. What percent of the final bond strength can I expect immediately after application? After 24 hours?  After 72 hours?

A. Immediately after an application is made, about 60% of the bond strength is achieved. As the adhesive continues to wet-out the surface, you can expect the bond to be at about 75% - 80% after 24 hours. After 72 hours, 95%+ of the bond strength is achieved. The bond will continue to build with time.

Q. Is the tape solvent resistant?

A. Yes, 3M acrylic foam tapes are resistant to most common automotive solvents like gasoline, diesel fuel, washer solvent, etc. Solvent resistance is a function of type of solvent, time of exposure and temperature.

Q. Why doesn`t the tape feel sticky?

A. 3M`s high performance acrylic adhesives tend to be firm and dry to the touch. They are designed to bond materials other than skin. The adhesives used are designed to give optimum performance and adhesion to automotive substrates and components. The natural oils and moisture of skin can vary from person to person and affect the "thumb appeal" of the 3M Acrylic Foam Tape. To one person the tape can feel very sticky and to another it can feel much less sticky to the touch. The difference in "thumb appeal" is in the variation of the 2 individual`s skin surfaces not the adhesive.

Q. The part is not adhering to the vehicle. What might be wrong?

A. Areas to investigate for poor adhesion or performance include:

  • Check for surface contamination. The substrates must be clean and free of any contaminant. This is the most common cause of poor adhesion.
  • Check for surface match. Are the two surfaces to be bonded a good match?
  • Check for proper application pressure and wet-out.
  • Check the back of the component for flatness.
  • Check the installation process for proper procedures.



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