Preventing glass from sliding on a surface - Page 1
Forum section: electronics / general

author: gnif
author_rank: Unknown
timestamp: March 24, 2017, 08:28:45 am
content: I have a small glass device (I can not divulge what it is at this point, nor it's function sorry) that I need to prevent from sliding around on a smooth surface when it is touched/bumped, etc. I would like to keep the glass optically clear for aesthetic reasons, so I am looking for some kind of product that can be applied to the bottom of the glass to give it some friction (rubber feet are not an option, it needs to be in contact across it's entire surface for structural reasons).The area in contact with the surface is roughly 250x250mm square and has nearly no mass to it. It needs to be able to be removed so a glue is of no use here, and it needs to be cleanable with soapy water. Is anyone aware of such a product? The first thing that comes to my mind is hair spray, but its not impervious to water, nor is it optically clear.Whatever it is it also needs to be cheap, the final cost of the device needs to be kept down to be competitive and as such expensive materials need to be avoided.

author: PointyOintment
author_rank: Frequent Contributor
timestamp: March 24, 2017, 09:05:30 am
content: s/devolve/divulge ?Plasti-Dip? Cast polyurethane rubber?

author: gnif
author_rank: Unknown
timestamp: March 24, 2017, 09:06:43 am
content: Quote from: PointyOintment on March 24, 2017, 09:05:30 amWow, my dyslexia really gets the better of me at times.

author: PointyOintment
author_rank: Frequent Contributor
timestamp: March 24, 2017, 09:12:15 am
content: Or cast silicone rubber. I don't know why that didn't come to mind the other minute. It might be harder to get optically clear, though, even if bubble-free. But that's just a guess; I'm not experienced with any of these materials.

author: yuzuha
author_rank: Contributor
timestamp: March 24, 2017, 09:14:47 am
content: thin layer of clear silicone rubber ?

author: Nusa
author_rank: Super Contributor
timestamp: March 24, 2017, 09:18:46 am
content: How thick can it be?Clear plastic like those used for screen protectors on smartphones and tablets?Clear plastic food wrap? Can't get much cheaper than that.

author: Marco
author_rank: Super Contributor
timestamp: March 24, 2017, 09:24:04 am
content: There's removable transparent vinyl/pvc sheets for decals, maybe you could glue two of those together to make your own double sided clear sticky tape? (Which doesn't usually come in 250mm width.)PS. on second thought it's only removable when you can peel it off, the adhesive is probably far too strong to get the device off by simply wrenching or levering it. This is going to be a problem for anything but the flimsiest of adhesives, for anything strong you'll need to get a long thin blade or steel wire under there to cut it off. Or use heat.

author: jpanhalt
author_rank: Super Contributor
timestamp: March 24, 2017, 09:43:29 am
content: Quote from: gnif on March 24, 2017, 08:28:45 amNot quite sure the distinction you make between "glue" and an "adhesive" like hair spray.In any event, silicone rubber (as suggested) and thin elastomers as used to protect the faces of LCD's might be considered. I would also consider a low-melting thermosetting plastic/adhesive or polyolefin (e.g., wax). Shellac was used for centuries as a temporary, thermosetting adhesive. But you can probably find a more desirable temperature range with modern "hot melts" or waxes (waxes can be used as temperature gauges and come with a variety of relatively low melting points up to several hundred degrees Celsius.John

author: gnif
author_rank: Unknown
timestamp: March 24, 2017, 09:51:23 am
content: Quote from: jpanhalt on March 24, 2017, 09:43:29 amYou're quite correct, I was thinking hairspray as to the apparent tackiness it has.I think at this point the silicone rubber is the best option, it needs to conform somewhat as the surface it sits on may not be defect free.

author: jpanhalt
author_rank: Super Contributor
timestamp: March 24, 2017, 10:01:41 am
content: As a pad, silicone will be fine. A drop of water or alcohol will improve adhesion. Removal (if used as a monomer that you let polymerizein situ), could be difficult. Thermosetting stuff -- even chicken fat -- avoids that removal problem.Good luck.Johnedit: It the thickness of the silicone (or other rubber) allows it, a fine wire pulled underneath is a common way to cut or release the bond.

author: Arjan Emm
author_rank: Regular Contributor
timestamp: March 24, 2017, 10:12:12 am
content: To wich material do you want the glass to stick too? Maybe water glass, a saturated solution of sodium silicate, might do the job. It's water clear. Pretty sticky to start with. And as water evaporates becomes a solid. You can easy stick two sheets of glass together with it. Initially you will be able the slide the sheets, as water evaporates from the edges they become totally stuck in a day or so. So you end up with a water soluble solid connection at the edges and a clear liquid film in the middle. Over time water will evaporate from the middle too and will become opaque, this can take up to weeks to several months. getting them apart will also become progressively harder over time. The water glass is dirt cheap.

author: gnif
author_rank: Unknown
timestamp: March 24, 2017, 10:24:09 am
content: Thanks but it doesn't need to adhere/stick, just prevent it from moving around if bumped, it has to be possible to pick it up, moved, cleaned, etc. The contacting surface is unknown, it could be anything from wood to glass.

author: Halcyon
author_rank: Unknown
timestamp: March 24, 2017, 10:38:23 am
content: I'm curious as to the device now. :-)

author: Arjan Emm
author_rank: Regular Contributor
timestamp: March 24, 2017, 10:39:10 am
content: okay, then just put a thin sheet of say 0.5mm latex between the glass and the secret layer. It will not slide if bumped and you can just take it off without cleaning.

author: mrflibble
author_rank: Super Contributor
timestamp: March 24, 2017, 11:51:13 am
content: Silicone baking mat. Either just slap down the entire sheet on your work surface, or cut to size if your purpose requires that. Have several of those in different colors, useful for all manner of things. Well, except baking obviously. Why yes, please add random stuff from the Chinese bargain bin to my food.I'd rather use a uranium glass baking tray thank you very much.(Voor iets van 2.50 bij de Action, verdraaid handig.)

author: jm_araujo
author_rank: Regular Contributor
timestamp: March 24, 2017, 11:58:46 am
content: I would go with "electrostatic film". It's sold for glass windows in a variety of styles, including clear.It has a "rubbery" feel and I don't think it will slide easily on surfaces. As it adheres by electrostatic charge you can just peel it off without leaving any residue.Use google to find a local supplier, in my country I can find it in home improvement stores.

author: edpalmer42
author_rank: Super Contributor
timestamp: March 24, 2017, 04:14:50 pm
content: If you cover the entire area with silicone or any other similar material, you could have a lot of trouble picking the item up. It'll be like a suction cup.I've never worked with them, but I've heard of 'gauge blocks' (https://en.wikipedia.org/wiki/Gauge_block) which are solid steel blocks that are so flat and smooth that when you put them together, suction holds them together. You don't need a flexible rubber cup shape to form a suction cup.Ed

author: SeanB
author_rank: Super Contributor
timestamp: March 25, 2017, 10:21:47 am
content: How about a water clear epoxy, applied as a few drops to the glass, then either levelled by gravity or spin levelled in a small jig that rotates the glass to spead this in an even layer. Kind of like you do to coat a silicon wafer in manufacture, or coat a blank CD to get the protective top on it after stamping and metallising.

author: German_EE
author_rank: Super Contributor
timestamp: March 25, 2017, 03:51:16 pm
content: Alternative 1, speak to 3M about the adhesive that they use on post-it pads.Alternative 2, speak to a windscreen repair place, a couple of small dots of the stuff they use might be enough to solve your problem and it's optically clear

author: PointyOintment
author_rank: Frequent Contributor
timestamp: March 26, 2017, 07:07:39 am
content: Quote from: edpalmer42 on March 24, 2017, 04:14:50 pmYou don't just put them together.You have towringthem together, even under vacuum, apparently.However, the flat suction cup effect may indeed be relevant in this application.

author: David Hess
author_rank: Super Contributor
timestamp: March 26, 2017, 10:04:23 pm
content: Clear vinyl film is available which is ideal for this purpose. It is optically clear, deformable, and tacky enough to stick to glass and other surfaces. It will easily prevent the glass from slipping but the glass can always be removed later. There is also a silicon rubber equivalent.