Custom BSR/NVH Pads, Trim & Badge Bonding Tape, Panel Attachment & Weatherseals

BSR is the noise an assembly makes against itself, with three flavors and three fixes. Squeak is stick-slip friction between two surfaces that grip and release; the fix is a low, stable-friction interface, classically SAE pressed felt or a low-friction tape, at the contact line. Rattle is a loose part knocking against its surroundings; the fix is a soft foam or elastomer cushion, soft PORON or vinyl nitrile, that takes up the gap and absorbs the impact at very low closure force.

Buzz is a thin panel resonating; the fix is a damping layer that drains the resonance, or a stiffener that moves it. The common thread is that the parts are thin, precisely placed, and to the contact geometry, and an EV makes them more audible because there is no engine noise to mask them.

Because the engine noise that used to mask it is gone. In a combustion vehicle, the broadband sound of the engine and exhaust covers a great many small interior noises; an EV powertrain is nearly silent at low speed, so residual sounds, a squeaking trim seam, a rattling console, a buzzing panel, a whistling cavity, stand out clearly to the occupant.

That raises the bar on every contact line and joint in the interior, which is why EV programs put more felt, foam and elastomer parts at trim interfaces, and more attention into damping and cavity sealing, than a comparable combustion car. Naming the mechanism, squeak, rattle or buzz, and placing the right thin part at the contact line is the systematic way to meet that higher bar.

Start with the substrate, then the load and the environment. The first question is the surface energy of what you are bonding to: high-surface-energy metals, glass and painted panels accept a standard acrylic foam tape, while low-surface-energy plastics, many trims and claddings, resist and need a tape adhesive designed for them, often with a primer. Then size the tape for the static and dynamic shear the part sees and for the thermal movement between dissimilar materials, and confirm it survives the exterior weathering.

Peel is measured per ASTM D3330 on the actual substrate. Send the substrates on both sides, the bond area and load, and the service-temperature range, and the tape grade, thickness and any primer can be matched against the data sheet.

Because the bond has not built yet. An acrylic foam tape does not reach full strength on contact; it wets the surface and builds peel and shear over dwell time, often rising steeply in the first hour and approaching full strength over roughly a day, faster on a high-surface-energy substrate and slower on a low-surface-energy plastic. Pulling or stressing the part too soon reads as a weak tape when it is really an early measurement on a bond still building.

The tape bond build planner on this page steps through the dwell stages and shows how the plateau differs by substrate. The practical fix is to set handling and fixturing rules that respect the build, apply firm pressure to wet the surface, and confirm the build time and any primer requirement on the manufacturer's data sheet for your substrate.

When you want to spread load, absorb movement and seal in one joint without marking the surface. A high-bond acrylic foam tape spreads the load over the whole bond line rather than concentrating it at fasteners, which suits thin panels and claddings that would dimple at a screw; it absorbs the thermal expansion mismatch between dissimilar materials, such as a plastic cladding on a steel body, which a rigid fastener cannot; and it seals the joint against water at the same time.

It also gives a clean exterior with no visible fasteners. The trade-offs are the dwell time to build strength and the need to match the adhesive to the substrate, so a bonded panel attachment is specified where load spreading, movement and sealing matter, with the shear and the substrate confirmed against the data sheet.

Because EPDM is inherently resistant to the things that destroy an exterior seal: weather, ozone and UV. A door, glazing or aperture seal lives in sun, rain and a wide temperature swing for the life of the vehicle, and a material that hardens, cracks or chalks under ozone and UV would leak within a few seasons. EPDM holds its elastomeric properties and its compression set under that exposure, so an EPDM foam seal keeps compressing to close the gap and recovering across cycles for years.

The trade-off is that EPDM has limited oil resistance, so where a seal also sees oil, an under-body location for example, vinyl nitrile is the move; and where a denser profile is needed, solid EPDM serves. Confirm the grade, the compression set and the weathering against the data sheet for your aperture.

They do opposite jobs even though both sit in a joint. A bonding tape is an adhesive part: its job is to hold two surfaces together, spreading load and absorbing movement, and it happens to seal the bond line as a by-product. A weatherseal is a compression part: its job is to close a gap against water and wind by being squeezed between two surfaces that move relative to each other, a door against its frame, a liftgate against its aperture, and it is not adhered across that moving interface.

So a bonding tape is specified by its peel and shear and its substrate, while a weatherseal is specified by its compression-deflection, its recovery, and its weathering resistance. Using a bonding tape where a moving seal is needed, or a foam seal where a structural bond is needed, both miss. Tell us whether the joint is bonded or sealed and the right family follows.

No, and an over-thick pad can create its own problem. An anti-rattle cushion works by taking up the gap that lets a part move and absorbing the impact at a very low closure force; it must not push the two parts apart or transmit a load that distorts the trim. A pad that is too thick or too firm for the gap pre-loads the joint, can force a panel out of position or creak under the added stress, and may telegraph through a visible surface.

The right answer is to size the cushion to the actual gap and tolerance with a soft, low-closure-force material that just fills the space and damps the knock, then confirm it recovers and holds its thickness, that compression set stays low, over the life of the part. Send the gap, the tolerance and the available closure force so the thickness and grade can be matched.

Those numbers belong to a tested joint or assembly, not to a raw material on its own. The acoustic transmission loss of a body treatment is measured under SAE J1400 on the built-up panel, so a damping or barrier material supports the panel's performance but the rated transmission loss is a property of that assembly. Likewise, peel adhesion of a bonding tape is measured per ASTM D3330 on a specific substrate, so the peel value belongs to that tested bond, not to the tape in the abstract.

So the honest framing is that H-O materials are evaluated against and support compliance with these methods through the manufacturer's data sheet, and H-O does not independently certify a material to an acoustic or peel value unless that is explicitly stated on the quote. If you need a measured number, it comes from a test of the actual assembly or bond.

H-O is a precision converter, not a raw-material producer. We do not extrude or mold the foam, rubber and tape stock; we buy sheet, roll and tape stock from the material manufacturers and convert it to your drawing, by die-cutting, kiss-cutting, laser and waterjet cutting, adhesive lamination, slitting and kitting, with material traceability and lot-level data-sheet records.

Every BSR, bonding and seal part is made-to-order; we do not carry finished parts in stock and we do not advertise a no-minimum policy, though prototype quantities through full production runs are equally welcome and the minimum varies by material and part.

Prototype and production timing is summarized in the process strip near the top of the page and on the quote form. Send your drawing or describe the part through the form below for a specific quote.

Whatever suits the station: individual die-cut parts, kiss-cut parts on rolls or sheets for peel-and-place, or kitted sets grouped by assembly step. Roll presentation and liner choice affect installation time on trim lines, so format is worth deciding at the prototype stage.

Yes — material swatches and cut samples are available on request, subject to material availability. For evaluation builds, the usual path is to send the part drawing so prototype parts are cut from the actual grade and thickness under consideration; that puts representative parts in your fixture instead of a generic swatch.