Chem-Set VST6364 General Purpose Acrylic Foam High Bond Tape, 25 mil, Gray or White

Chem-Set VST6364 is a 25 mil general purpose acrylic foam tape used as a 3M VHB RP25 alternative for bonding panels, trim, and assemblies without visible fasteners. It’s the thinnest grade in the VST general purpose line and it carries the highest tensile and shear numbers in that group, which makes it the pick when your parts fit well and you want the bond line as tight as possible. Designed for high and medium surface energy materials including PVC, ABS, glass, steel, aluminum, and ceramic. High initial tack means it grabs on contact with no cure time, no mixing, and no dispensing equipment.

Available in gray and white, with identical published performance in both colors. The conformable acrylic foam core absorbs the differential expansion between materials that grow and shrink at different rates, and it damps vibration rather than passing it into the joint. Supplied in 36 yd rolls with a red PE liner, in four widths from 1/4 in to 1 in. Sold by the individual roll with no case minimum, and PFAS and PFOS free per the manufacturer.

Key Product Details

Gray and white share the same construction, thickness, and published performance. Color is a selection choice on this grade, not a performance choice.

What VST6364 Bonds To

VST6364 is designed for high and medium surface energy materials. On these it bonds directly after cleaning, with no primer:

• PVC and ABS, the two the data sheet calls out specifically
• Glass
• Steel, including galvanized and stainless
• Aluminum, including anodized and coated
• Ceramic
• Other high and medium surface energy plastics

Low surface energy plastics and powder coat need either a primer or a different grade. Polypropylene, polyethylene, and similar low surface energy materials will not hold reliably on a clean-and-stick process, and powder coated surfaces are hit or miss depending on the coating. With the correct primer or activator, VST6364 reaches strong adhesion on these as well. If low surface energy plastic or powder coat is your main substrate, the VST 78xx grades are formulated for it and skip the priming step entirely. Call us and we’ll tell you which route makes more sense for your part.

Porous materials need sealing first. Wood, particleboard, concrete, and masonry do not present a unified surface for the adhesive to flow onto. Seal them before bonding, or use a different fastening method.

At 25 mil, check your fit before you commit. This is the thinnest grade in the general purpose line, so it has the least ability to absorb a bowed panel or a rough surface. If the two faces don’t meet cleanly across the whole bond area, step up to 31 or 47 mil rather than trying to fix it with more pressure.

How Acrylic Foam Tape Bonding Works

Acrylic foam tape does not dry or cure. It builds strength as the adhesive flows into the microscopic texture of the surface, which means the bond you get is decided almost entirely by surface prep, pressure, and dwell time. The steps below are the ones that determine whether the joint holds.

1. Get the conditions right. Bring the parts and the tape to at least 65°F before you apply. Below that the adhesive is too firm to flow, and no amount of pressure fixes it. Between 32°F and 65°F, use the VST low temperature grades instead.
2. Clean the surface. Fingerprints and light oil come off with an isopropanol wipe. Grease and mold release need a stronger non-polar cleaner first. Use lint free tissue and wipe in one direction so contamination leaves the part instead of moving around on it. Surface test inks will tell you whether the cleaner you’re using is actually working.
3. Abrade or prime where the surface calls for it. Mill finish aluminum and stainless benefit from light abrasion followed by a solvent wipe. Painted surfaces, powder coat, and low surface energy plastics need a primer or activator. Apply primer only where the tape lands and wipe the excess immediately.
4. Lay the tape, then pull the liner. Apply the tape to one part first, position the assembly, then remove the red liner and mate the parts right away. Once the liner is off, the open face picks up airborne dust fast.
5. Apply real pressure. Roll the joint in one direction at 10 to 50 N/cm, around 30 N/cm for most work, at about 24 in/min. Pressure matters more on a thin tape than a thick one, because there is less adhesive available to flow into the surface.
6. Let the bond build. Handling strength is immediate thanks to the high initial tack. Full strength develops over about 24 hours at ambient temperature, and warmth speeds it up. Plan shipping and load bearing service around that window rather than loading the joint the same hour it was made.

Joint design matters as much as prep. Design the bond so load runs in shear or tension across the full tape area. Peel and cleavage loads concentrate stress on one edge, and a thin tape has less material to distribute it. When you need more capacity, widen the tape rather than thickening it.

Performance in Production

• 97 lb/in² dynamic shear means a 1 in wide strip across a 3 in bond gives roughly 291 lb of shear capacity before you apply a safety factor. Size the bond area off the load, not off the tape thickness.
• 100 lb/in² normal tensile and 97 lb/in² shear are the highest in the general purpose line, above both the 31 mil and 47 mil grades. Less foam means less compliance in the bond line, and in straight tension and shear that reads as higher strength.
• 19 lb/in peel is the tradeoff. The thicker grades peel harder because the extra foam spreads the load away from the edge, so keep exposed edges out of the design or protect them mechanically.
• The static shear numbers are the ones to design against for hanging loads. It holds 500 g at 200°F for a week, so a joint carrying weight continuously in a hot environment stays put rather than creeping.
• High initial tack grabs on contact, so panels hold position while you work instead of needing clamps or temporary fasteners.
• At 25 mil the bond line stays tight, which matters where a thicker foam would show at a reveal, push a panel out of plane, or interfere with a trim fit.
• The 1/4 in width is the one to reach for on narrow returns and small parts, where a wider strip would run past the flange.
• Bonding rather than spot welding thin gauge material avoids heat distortion, burn-through, and the grinding and refinishing that follows a weld seam.
• The continuous bond line seals as it bonds and puts no dissimilar metal in contact, so there’s no galvanic corrosion path the way there is with a steel fastener through aluminum.
• Test on your own substrate in your own process before you run production. Published values come from lab panels, and surface finish, coating, and cleaning practice all move the result.

Common Applications

• Sign and display: trim and molding attachment, sign face and PVC panel bonding on well-fitted parts, point of purchase displays and retail fixtures
• Trailer and specialty vehicle: interior ABS and PVC trim, badge and applique mounting, thin panel attachment where clearance is tight
• Metal fabrication: nameplates and ID plates, thin steel and aluminum panel assembly, replacing spot welds and rivets where distortion or read-through is a problem
• Cladding and facade: trim, closures, and reveal details where panel fit is controlled
• PVC trim and millwork: bonding PVC trim, moldings, and fabricated components
• General manufacturing: appliance trim, enclosure and cabinet assembly, decorative trim, gasket and seal attachment
• Bonding dissimilar materials that expand and contract at different rates, where a rigid fastener would fatigue the joint

For load bearing structural glazing and metal cladding, the dedicated Chem-Set structural glazing and structural cladding grades are the right specification rather than a general purpose tape. Call and we’ll get you to the correct grade.

Working From a 3M Part Number

If you are specced into a 25 mil 3M VHB™ grade and need another source, use the table below. The cross reference is matched on construction, color, and thickness.

If you’re working from 5925, this is not the right page. 5925 is a black tape built on a modified acrylic for medium and lower surface energy surfaces, which is what makes it work on powder coat and harder plastics. VST6364 is gray or white on a standard acrylic for high and medium surface energy. The closer match on color, thickness, and chemistry is VST7825, our 25 mil black low surface energy grade. Call us and we’ll confirm the right one for your substrate before you order.

A cross reference is a starting point for selection, not a statement that two products perform the same. The specifications above are ours, published from the current manufacturer data sheets. Read both data sheets and test the tape in your own joint before you commit a production process. Working from a 3M number that isn’t listed here? Call us, our full cross reference covers the clear, low temperature, low surface energy, automotive, and structural grades as well.

Most shops calling us about a 25 mil general purpose acrylic foam tape are calling because of how it’s sold, not how it performs. Comparable grades commonly ship in case quantities from four to thirty-six rolls, with lead times measured in weeks. VST6364 sells by the individual roll, with volume pricing when you need it, and in-stock orders placed by 2pm Eastern ship the same day.

Choosing a Thickness in the General Purpose Line

All four grades share the same adhesive and the same core chemistry, so the numbers move in a predictable way. Thinner runs higher in tensile and shear. Thicker runs higher in peel and absorbs more surface irregularity. Pick on how well your parts fit first, then check the load direction.

Available Sizes

Four widths, each in gray or white, all on 36 yd rolls.

• 1/4 in x 36 yd x 25 mil for tight returns, narrow trim, and small parts
• 1/2 in x 36 yd x 25 mil for narrow flanges and trim
• 3/4 in x 36 yd x 25 mil for general assembly work
• 1 in x 36 yd x 25 mil for more bond area to carry the load

Every size sells as a single roll with volume pricing at higher quantities. Custom slit widths from 4 mm up to 250 mm, longer 66 m rolls, and jumbo log rolls are available. Call for lead time.

Related Products

• Chem-Set VST6120 High Bond Tape, 47 mil, Gray or White when the parts are less uniform. The volume seller in the line.
• Chem-Set VST3025 Clear Ultra-Thin High Bond Tape, 10 mil when you need an even tighter bond line and the parts are flat and rigid
• Chem-Set VST6100C Clear Acrylic Foam High Bond Tape, 40 mil when the bond line will be visible
• Full Chem-Set VST tape line including the 31 mil and 63 mil general purpose grades, the low temperature grades for cold shop conditions, the black low surface energy grades for powder coat and polyolefins, and the complete cross reference chart
• Metal bonding adhesives if a structural two part adhesive is a better fit than tape for your joint

Frequently Asked Questions

What is Chem-Set VST6364 used for?

VST6364 is a 25 mil general purpose double sided acrylic foam tape used to bond panels, trim, and assemblies without visible fasteners. Typical work is sign trim and PVC panels, trailer interior trim and appliques, nameplates and thin metal panel assembly, cladding trim and closures, and appliance and enclosure assembly. It replaces rivets, screws, spot welds, and liquid adhesive.

Can VST6364 replace 3M VHB RP25?

VST6364G is the closest Chem-Set match to 3M VHB RP25. Both are gray 25 mil general purpose acrylic foam tapes formulated for high and medium surface energy substrates, and both come on 36 yd rolls. It is not a 3M approved substitution and the two manufacturers do not publish identical test conditions, so the right answer for your assembly comes from testing it in your own joint. One practical difference to plan for: VST6364 wants the surface at 65°F or warmer at application, where 3M publishes 60°F for RP25. Call us for a sample roll.

Is VST6364 a replacement for 3M VHB 5925?

No, and the difference matters. 5925 is a black tape built on a modified acrylic for medium and lower surface energy surfaces, which is why it works on powder coat and harder plastics. VST6364 is gray or white on a standard acrylic for high and medium surface energy. If you’re replacing 5925, ask us about VST7825, our 25 mil black low surface energy grade, which matches on color, thickness, and chemistry. Swapping 5925 for a standard general purpose tape on a powder coated part is the most common way these bonds fail.

Is grey or gray tape the same thing?

Yes, grey and gray are the same color and the same product. VST6364G is the gray version and VST6364W is white. Both have identical published performance, so choose on appearance at the joint.

Why does the thinner VST6364 have higher shear strength than the thicker grades?

Because the foam core is the compliant part of the bond line. Less foam means less give under a shear or tensile load, so the thin grades report higher numbers on those tests: 97 lb/in² shear at 25 mil against 86 lb/in² at 47 mil. The tradeoff runs the other way on peel, where the thicker grades win because the extra foam spreads the load away from the edge instead of concentrating it. Neither is stronger overall. Match the thickness to how well your parts fit, then check which direction your load actually runs.

Should I use VST6364 at 25 mil or VST6120 at 47 mil?

Start with how well your parts fit. VST6364 at 25 mil needs both faces to meet cleanly across the bond area, and rewards you with a tight bond line and the highest shear and tensile in the line. VST6120 at 47 mil absorbs the bow and surface irregularity you get on real sheet metal and extruded plastic, which is why it’s the volume seller. If you’re unsure, 47 mil is the safer default and 25 mil is the better answer when clearance or appearance is driving the decision.

Does VST6364 bond polypropylene, polyethylene, or powder coat?

Not without help. VST6364 is formulated for high and medium surface energy materials such as PVC, ABS, glass, steel, aluminum, and ceramic, and it bonds those directly after cleaning. Polypropylene, polyethylene, and similar low surface energy plastics need a primer or activator, and powder coated surfaces vary enough by coating that they should be tested. If low surface energy plastic or powder coat is your primary substrate, the VST 78xx grades are built for it and skip the priming step. Call us with your substrate and we’ll tell you which route fits your process.

Can I buy one roll, or do I have to buy a full case?

You can buy one roll. Every width and both colors are stocked and sold individually with volume pricing if you need more, and in-stock orders placed by 2pm Eastern ship the same day. Case quantities and multi-week lead times are the usual reason a shop calls us looking for another source in the first place.

Where is Chem-Set VST6364 made?

VST6364 is manufactured in South Korea and stocked at our warehouse in Huntingdon Valley, Pennsylvania. In-stock orders placed by 2pm Eastern ship the same day.

Questions on fit for your panel bonding or trim application, or working from a 3M part number you can’t get? Call (800) 220-1966 or email [email protected].

3M and VHB are trademarks of 3M Company. Chemical Concepts is not affiliated with, authorized by, or endorsed by 3M. Third party part numbers are referenced for product identification and cross reference purposes only.