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3M VHB Tape

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Forum topic by oldnovice posted 05-15-2019 06:17 PM 222 views 0 times favorited 4 replies Add to Favorites Watch
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oldnovice

7475 posts in 3730 days


05-15-2019 06:17 PM

Topic tags/keywords: question joining vhb

I was just wondering if anyone has used 3M VHB (very high bond) tape for woodworking and, specifically for cross grain applications?

According to the 3M Web site the VHB tape has been used in transportation, metal working, construction, electronics, signage, and appliances with extremely good results.

-- "I never met a board I didn't like!"


4 replies so far

View DS's profile

DS

3145 posts in 2782 days


#1 posted 05-15-2019 06:44 PM

It works really good for making custom vacuum press bags…

I’ve never used it directly on wood. The foam tape comes apart before the adhesive lets go, though. It’s meant to be a permanent bond adhesive.

-- "Hard work is not defined by the difficulty of the task as much as a person's desire to perform it.", DS251

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John Smith

1797 posts in 525 days


#2 posted 05-15-2019 08:51 PM

yes, I have used a few rolls of VHB tape.
it will pull the freckles right off of a six year old.
strongly recommended when you need a PERMANENT bond
between two smooth surfaced materials.
the kind I use does not have a foam center like picture frame tape . . . .
it is thick clear vinyl tape with very aggressive adhesive on both sides.
[try to imagine Weldwood Contact Cement on a tape. once stuck, there
is no picking it up to reposition it].

.

.

-- Failure is proof that you at least tried ~ now, go do it again, and again, until you get it right --

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CaptainKlutz

1236 posts in 1856 days


#3 posted 05-15-2019 09:11 PM

They work very well, when used properly! :)

Each 3M VHB tape has a very specific set of limitations that have to be compatible with task. There are also different tapes for different purposes, which makes it very hard to help you with generic information.

Can say that many 3M VHB products are not a lifetime (50-100 year) bonding adhesive (IMHO). The majority of them are modified acrylate based adhesives (think soft super glue in tape form). They have general tendency to age harden (years), and are less able to deal with bond line stress as they age. Aging level is dependent on heat and moisture levels.
This is not say that they won’t last 100 years, but that the adhesive properties tend to change as they age. This means that your sign may fall off the wall, that annoying plastic wire holder will not stick to washing machine, or metal skin of trailer may pop off during accident; after it ages 5-50 years. Yes, those are the typical applications. :)

VHB also comes in many forms: temporary bonding, permanent bonding, using single layer adhesive to multi-layer formats with plastic or foam inter-layers to help with stress issues. Multi-layer tapes can even be purchased with different chemistry on each side of carrier to allow mismatched materials bonding. Getting the right tape for your application is important.

Have a lot of adhesives experience from work life. When I need an adhesive and my quantities used are not many kilograms per week so the large corporate tech support will help; I call my friends over at Ellsworth adhesives. They have broad background in many unusual bonding applications; and always seem eager to help as long as you buy stuff. They also sell small quantities of industrial adhesives usually only available from mfg via WWW. Prices are not cheap, but there are not many places to get the industrial grade stuff.

As always, I am just another idiot with some experience posting to a forum: so YMMV.

-- I'm an engineer not a woodworker, but I can randomly find useful tools and furniture inside a pile of lumber!

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MrRon

5440 posts in 3605 days


#4 posted 05-15-2019 09:25 PM

I use VHB tape all the time for my model builds. The surfaces need to be smooth for good adhesion. When I build a model like a large scale locomotive, I use a combination of VHB, titebond, epoxy and contact cement. If I want an instant bond, I use VHB tape.

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