Bonding Rubber to Metal: How to Specify the Right Adhesive

Nearly every enquiry that starts “what glue sticks rubber to metal” is asking the wrong question first. The adhesive is the second decision. The first is what kind of rubber you actually have — because cured rubber and thermoplastic elastomer behave so differently that the products which work on one are usually the wrong choice on the other.

This page sets out how we specify a rubber-to-metal bond at Austen Direct: the substrate question, what we stock for each answer, the surface preparation that decides whether the bond survives, and where we will tell you a tape is not the right tool. We are industrial adhesive consultants and a tesa Platinum Distributor Partner, supplying trade quantities to UK manufacturers since 1965.

The question that decides everything: cured rubber or thermoplastic elastomer?

Two families get called “rubber” on a drawing, and they need different technology.

	Cured (vulcanised) rubber	Thermoplastic elastomer
Typical compounds	EPDM, nitrile (NBR), neoprene (CR), SBR, butyl, natural rubber	PP/EPDM, TPV, TPE, Santoprene-type grades
Where you meet it	Anti-vibration mounts, bonded linings, extruded seals and gaskets, conveyor lagging, bushes	Moulded exterior trim, attachment parts, body seals on vehicles and enclosures
Surface character	Porous to varying degrees, frequently carries mould release or surface bloom	Low surface energy, smooth, mould-released
What normally works	Liquid contact adhesive applied to both faces	Acrylic foam tape with an LSE adhesive, or a heat-activated system

If you are not certain which you have, the quickest practical check is heat: a thermoplastic elastomer softens and can be re-melted, cured rubber does not. Offcuts from the moulder settle it in seconds. If there is any doubt, send us a sample — this is exactly the question our specification team exists to answer, and getting it wrong is expensive later rather than obviously wrong on the bench.

Where we will tell you a tape is not the answer

We sell a great deal of double-sided bonding tape, so it is worth saying plainly: we do not specify a pressure-sensitive tape for bonding cured rubber to metal. Nothing in the tesa industrial bonding range we stock is published for that substrate, and we will not extend a published figure to a substrate the manufacturer has not tested.

The reason is the rubber, not the tape. A pressure-sensitive adhesive builds its bond by wetting out against a surface under pressure. Cured rubber compounds routinely carry residual mould release, and many carry migrating additives that bloom to the surface over time. Both sit between the adhesive and the substrate. A PSA bond can look entirely sound on the bench and release months later in service, which on an anti-vibration mount or a bonded lining is the worst possible failure mode — invisible until it matters.

One point of genuine confusion worth clearing up here. tesa HAF® 8401 is a heat-activated film whose adhesive is described by tesa as nitrile rubber / phenolic resin, and it is an outstanding high-temperature bonding film — tesa publishes 300 °C short term and 220 °C long term, with a dynamic shear resistance of 12 N/mm² at 200 µm. But “nitrile rubber” there describes the adhesive chemistry, not the substrate it bonds. tesa’s own description is that it is “suitable for bonding of all thermal resistant materials such as metal, glass, plastic, wood and textiles.” Rubber is not on that list, and searching for a nitrile adhesive will keep leading you to it.

tesa states that its published figures “shall be considered as average values and are not appropriate for a specification”, and that the user is responsible for determining whether the product is fit for a particular purpose and suitable for their method of application. We quote them on that because it is also the honest position: the datasheet narrows the field, the trial settles it.

What we stock for cured rubber to metal

For cured rubber the answer is a liquid contact adhesive applied to both faces. Our main range for this is TensorGrip®, supplied as a self-contained 22-litre canister system with a spray gun and hose rather than tins and a brush — which is what makes it a production process rather than a bench job.

The figures below are the manufacturers’ own published values for the grades we stock. They are a starting point for selection, not a specification for your joint.

Grade	Published temperature resistance	Why it gets specified here
TensorGrip® F10	up to 155 °C	The one grade whose published substrate list names rubber — but plasticised rubbers specifically, alongside vinyl, leathers and plastics, which is not the same thing as a cured EPDM or nitrile compound. Plasticiser-resistant, which matters where a compound leaches into the bond line and causes delamination
TensorGrip® L17	120 °C	The sheet-metal grade. Class 1 fire rating and BS 6222 bond strength approval. Carries the clearest published surface-prep instruction in the range
TensorGrip® LP61	128 °C	Class-0 fire rating and non-flammable. Where a fire specification governs the assembly, this is usually the constraint that selects the adhesive
TensorGrip® F40	good heat resistance (see TDS)	Non-chlorinated synthetic rubber grade, HAPs free, long open time. Useful where parts need positioning before closing
TensorGrip® F60	95 °C	Non-chlorinated (non-MECL) where solvent classification is the governing issue
3M™ Scotch-Weld™ 1300L TF	−21 °C to +149 °C	Also stocked, in 1-litre cans. 3M’s published substrate list covers metal, wood, most plastics, and neoprene, reclaim, SBR and butyl rubber

Two things are worth noticing in that table. The first is that EPDM is not named on any of the published substrate lists above. 3M’s for Scotch-Weld 1300L TF names neoprene, reclaim, SBR and butyl; TensorGrip’s for F10 names vinyl, plasticised rubbers, leathers and plastics. EPDM is the compound most people are holding when they search this question, and it is absent from both. Where a compound is not named on a datasheet we trial it rather than specify it — send us the material and we will put a sample on it.

The second is that temperature resistance is the figure most often quoted and least often the real constraint. Solvent classification, fire rating and open time decide more specifications than peak temperature does.

Surface preparation decides the outcome

More rubber-to-metal bonds fail on preparation than on adhesive selection. The clearest published instruction in our range is the one we publish for TensorGrip L17 on the metal face: the surface must be degreased and lightly abraded with fine abrasive or non-woven material. TensorGrip’s own datasheet for L17 puts preparation more generally — surfaces “clean, dry and free from dirt, dust, oil, loose paint, wax or grease” — so treat the abrading step as the sheet-metal practice we specify, not as a datasheet requirement. That sentence is worth reading twice, because “degrease then abrade” is frequently done in the wrong order — abrading a contaminated surface drives the contamination in.

General practice on the rubber face, which you should confirm against the technical data sheet for the grade you are using rather than take from this page: remove mould release before anything else, and treat any part that has been in stock for a long period as likely to have bloomed. We stock TensorGrip® C101, a biodegradable citrus solvent cleaner, degreaser and adhesive remover, in both 22-litre canisters and 500 ml aerosols for exactly this step.

When a bond does fail, the fracture tells you which problem you have. If it fails within the adhesive layer, the grade is wrong for the load or the environment. If it fails cleanly at either face, the preparation is wrong. Photograph the failed joint before you change anything — that one photograph usually shortens the diagnosis from weeks to a phone call.

Where tape is the right answer

If the flexible part is a thermoplastic elastomer rather than cured rubber — a moulded PP/EPDM trim piece, a TPV seal, a TPE attachment part — the picture reverses and acrylic foam tape becomes the better process. tesa publishes a dedicated LSE adhesive family for precisely these substrates, described as giving “excellent initial and long term adhesion on LSE substrates like PP EPDM”.

The grades we stock for that are tesa® ACXplus 77805 at 500 µm, 77808 at 800 µm and 79011 at 1,100 µm, the last rated by tesa to 120 °C short term and 95 °C long term. If your application is mounting an exterior attachment part rather than bonding a seal, the thickness and movement side of that decision is covered in more depth on our page on bonding exterior attachment parts, which includes a thermal movement calculator.

For high-temperature metal-to-metal and metal-to-plastic assemblies where a liquid adhesive would not survive the process, tesa HAF® 8401 is the heat-activated route — but as above, not for a rubber face.

Specifying it on your line

A 22-litre canister is a production decision, not a purchase off a page, which is why most of this work starts with a conversation rather than a basket. What we normally need to know: the rubber compound and whether it is cured or thermoplastic, the metal and its finish, the service temperature range, whether the joint is loaded dynamically, any fire or solvent classification that governs the assembly, and roughly what throughput you are working to.

From there we will recommend a grade, specify the preparation for your two substrates, and set up a trial on your own parts before anything is committed to. Most of our customers don’t order off a page — they pick up the phone and we work the spec out together.

Talk to the trade desk about your application, or call 01892 832141. We are at Ivy Arch Road, Worthing, West Sussex BN14 8BX.

Frequently asked questions

What adhesive should I use to bond rubber to metal?

It depends on the rubber, not on the metal. For cured rubber — EPDM, nitrile, neoprene, SBR, butyl — a liquid contact adhesive applied to both faces is the normal route, and we stock the TensorGrip range in 22-litre canisters plus 3M Scotch-Weld 1300L TF in 1-litre cans for this. For thermoplastic elastomers such as PP/EPDM and TPV, an acrylic foam tape with an LSE adhesive is usually the better process. Identify which family you have before selecting anything.

Can double-sided tape bond rubber to metal?

Not for cured rubber — we do not specify a pressure-sensitive tape for that substrate, because residual mould release and surface bloom sit between the adhesive and the rubber and can release a bond that tested sound on the bench. For thermoplastic elastomers such as PP/EPDM and TPV, acrylic foam tapes with an LSE adhesive are published for the substrate and work well.

Will an adhesive bond EPDM to steel?

EPDM is frequently absent from published substrate lists across the class — it is not named on 3M’s list for Scotch-Weld 1300L TF (neoprene, reclaim, SBR and butyl) or on TensorGrip’s for F10 (vinyl, plasticised rubbers, leathers and plastics). That does not mean it cannot be done. It means the grade is selected deliberately and proved on your own parts rather than assumed from a datasheet, which is what the trade desk is for.

How should the surfaces be prepared?

For the metal face, TensorGrip’s published instruction for L17 is that the surface must be degreased and lightly abraded with a fine abrasive or non-woven material — in that order, since abrading a contaminated surface drives contamination in. For the rubber face, remove mould release first and treat long-stored parts as likely to have bloomed. Confirm the procedure against the technical data sheet for the grade you are using.

Is tesa HAF 8401 a rubber-to-metal adhesive?

No. Its adhesive system is described by tesa as nitrile rubber and phenolic resin, which is the chemistry of the adhesive rather than the substrate it bonds. tesa describes it as suitable for bonding thermally resistant materials such as metal, glass, plastic, wood and textiles. It is an excellent high-temperature film — tesa publishes 300 °C short term and 220 °C long term — but rubber is not among its published substrates.

Do you supply trade quantities?

Yes. The TensorGrip contact adhesives are supplied as 22-litre canister systems with spray gun and hose, and tapes are cut to width from log rolls for your line. Austen Direct has supplied UK manufacturers as industrial adhesive consultants since 1965.