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3M 4926 / 4936 / 4941 / 4956 / 4991 VHB Acrylic Foam Tape - STK

When bonding plasticized vinyl, high-impact plastics, or mismatched metal assemblies, standard rigid tapes struggle with stress relaxation and chemical migration. The 3M VHB General Purpose Series 4941 Family-featuring 3M 4926, 3M 4936, 3M 4941, 3M 4956, and 3M 4991-is specifically formulated as a high-conformability 4941 Family - Conformable Plastic Bonding solution.

Engineered with a soft, viscoelastic acrylic foam core and a multi-purpose acrylic adhesive, this Acrylic Foam Tape product line resists plasticizer migration from flexible vinyl materials while conforming into deep surface irregular contours, painted metals, and engineered thermoplastics.

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Release Liner Differentiation: Standard Paper Liner vs. "F" Suffix Film Liner

To match varied manual assembly setups and automated rotary die-cutting machinery, the 4941 family is offered in two distinct liner configurations:

Standard Models without "F" (e.g., 3M 4926, 4936, 4941, 4956, 4991)

Supplied with a Kraft Paper Liner, offering exceptional tearability during manual hand application and economical converting costs.

Models with "F" Suffix (e.g., 3M 4936F, 4941F, 4956F, 4979F):

Equipped with a high-strength Film Liner (PE/PET Red Film). The red film release liner provides high tensile resistance against web breakage during high-speed rotary die-cutting, automated machine dispensing, and high-humidity storage.

Individual Model Technical Profiling & Thickness Matrix

The 4941 Family features a conformable gray acrylic foam core available in five distinct thickness profiles to match specific gap tolerances, shock absorption, and substrate mismatches:

① 3M 4926 (0.4 mm / 16 mil Thin Conformable VHB Tape)

Tape Thickness: 0.4 mm (0.016 in. / 16 mil)

Key Attribute: Thin-profile conformable VHB tape designed for sleek gap joints, thin sheet metal stiffeners, and flush plastic housings where minimum tape thickness is required.

Liner Availability: Standard Kraft Paper Liner.

② 3M 4936 & 3M 4936F (0.6 mm / 25 mil Low-Profile Plastic Bonding Tape)

Tape Thickness: 0.6 mm (0.025 in. / 25 mil)

Key Attribute: Low-profile structural tape offering fast wet-out on plasticized vinyl, acrylic, and painted metal surfaces.

Liner Availability: 3M 4936 (Paper Liner) / 3M 4936F (Red Film Liner).

③ 3M 4941 & 3M 4941F (1.1 mm / 45 mil Flagship Industry Standard)

Tape Thickness: 1.1 mm (0.045 in. / 45 mil)

Key Attribute: The primary global benchmark for conformable acrylic foam tapes. Delivers exceptional energy absorption, plasticizer resistance, and multi-substrate stress distribution.

Liner Availability: 3M 4941 (Paper Liner) / 3M 4941F (Red Film Liner).

④ 3M 4956 & 3M 4956F (1.55 mm / 62 mil Heavy-Duty Gap-Filling Tape)

Tape Thickness: 1.55 mm (0.062 in. / 62 mil)

Key Attribute: Thick conformable foam profile designed to bridge large gaps, absorb severe dynamic shock, and compensate for thermal expansion between mismatched metal and plastic panels.

Liner Availability: 3M 4956 (Paper Liner) / 3M 4956F (Red Film Liner).

⑤ 3M 4991 & 3M 4979F (2.3 mm / 90 mil Extra-Thick Structural Bonding Tape)

Tape Thickness: 2.3 mm (0.090 in. / 90 mil)

Key Attribute: Extra-thick viscoelastic foam core offering maximum gap-filling capacity and dynamic fatigue resistance over rough cast metals and heavily textured plastics.

Liner Availability: 3M 4991 (Paper Liner) / 3M 4979F (Red Film Liner - 0.030 in. / 0.8 mm Variant).

Technical Specifications Reference

Model Reference	Tape Thickness	Foam Core Type	Adhesive System	Liner Type Configuration
3M 4926	0.4 mm (16 mil)	Conformable Gray Acrylic	Multi-Purpose Acrylic	Standard Kraft Paper Liner
3M 4936 / 4936F	0.6 mm (25 mil)	Conformable Gray Acrylic	Multi-Purpose Acrylic	4936: Paper Liner / 4936F: Red Film Liner
3M 4941 / 4941F	1.1 mm (45 mil)	Conformable Gray Acrylic	Multi-Purpose Acrylic	4941: Paper Liner / 4941F: Red Film Liner
3M 4956 / 4956F	1.55 mm (62 mil)	Conformable Gray Acrylic	Multi-Purpose Acrylic	4956: Paper Liner / 4956F: Red Film Liner
3M 4991 / 4979F	2.3 mm (90 mil)	Conformable Gray Acrylic	Multi-Purpose Acrylic	4991: Paper Liner / 4979F: Red Film Liner

All models offer continuous temperature resistance up to +93°C (200°F) and short-term peak tolerance up to +149°C (300°F).

Primary Industrial Application Fields

3M 4941 Family - Conformable Plastic Bonding tapes are deployed across high-demand industrial assembly sectors:

Commercial Transportation & Bus Manufacturing: Bonding plastic trim, window reveal extrusions, side panel skins, and interior composite ceiling panels.

Architectural Signage & Plastic Lettering: Blind-fastening acrylic letters, polycarbonate lenses, and plastic light box displays without visible drill holes or screws.

Electronics & Household Appliances: Mounting glass control panels, plastic bezels, and internal wire harness channels onto painted steel enclosures.

Plasticized Vinyl & Trim Attachment: Direct bonding to flexible vinyl trims, PVC window extrusions, and synthetic rubber gaskets without adhesive softening over time.

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Precision Converting & B2B Supply Services

Selecting between Paper Liner and Film Liner versions depends on your specific converting and manufacturing setup. STK Tape provides full fabrication capabilities:

Custom Roll Slitting : Precision-slits master rolls into exact customer-specified widths (e.g., 6mm, 12mm, 19mm, 25mm, up to 1000mm) with clean, non-telescoping roll faces.

Precision Die-Cutting & Kiss-Cutting : Converts VHB tape into kiss-cut roll shapes, mounting gaskets, washers, and custom geometric parts. Film liner versions ("F" suffix) are specifically recommended for high-speed automated kiss-cutting without liner tearing.

Extended Pull-Tab Integration: Equips die-cut VHB foam gaskets and mounting pads with extended non-adhesive pull-tabs, allowing assembly line operators to quickly peel the liner and position structural parts without touching active adhesive edges.

Our factory & Equipment

coating machine

coating machine

rewinding machine

slitting

Tape-Die-cutting

Tape-Die-cutting

Custom Adhesive Tape Solutions

We provide comprehensive adhesive tape customization and converting services, including custom thickness, size, core, packaging, release liners, and die-cutting solutions to meet your specific application requirements.