3M™ 3748 Hot Melt Adhesive

3M 3748 Hot Melt Adhesive: Performance and Industrial Applications

The 3M 3748 hot melt adhesive is a proven benchmark for demanding industrial applications. It provides fast, durable adhesion across a wide range of materials.

Formulated with a polyamide base, it resists high temperatures and mechanical stress. It is ideal for bonding plastics, metals, and textiles.

Application is simple using a standard hot melt glue gun, ensuring a clean and consistent result from the very first use.

What is the 3M 3748 hot melt adhesive?

The 3M 3748 hot melt adhesive is a polyamide-based adhesive designed for industrial applications that require high mechanical and thermal resistance.

It comes in stick form, compatible with standard glue guns. Application is fast: the glue melts, is applied, and then solidifies within seconds upon cooling.

Composition and Key Technical Specifications

The polyamide formulation gives it resistance to oils, solvents, and higher temperatures than conventional EVA adhesives. This is a decisive advantage in challenging industrial environments.

Here are its main characteristics:

• Application temperature: approximately 190 °C
• Thermal resistance: up to 120 °C in continuous service
• Open time: short, ideal for rapid assembly
• Adhesion: excellent on metals, plastics, wood, textiles, and composites

Compared to a standard EVA adhesive (such as 3M 3762), the 3748 offers much better heat resistance and superior chemical resistance, at the cost of a slightly higher viscosity.

Characteristic	3M 3748 (Polyamide)	3M 3762 (EVA)	3M 3792 (EVA LT)
Chemical base	Polyamide	EVA	Low-temp EVA
Application temp.	~190 °C	~177 °C	~120 °C
Thermal resistance	Up to 120 °C	~60 °C	~50 °C
Chemical resistance	High	Medium	Low
Target substrates	Metal, plastic, composite	Cardboard, wood, textile	Heat-sensitive materials

What are the uses of the 3M 3748 hot melt adhesive?

The 3M 3748 hot melt adhesive is a versatile polyolefin-based adhesive designed to bond materials that are difficult to join using other methods.

It is particularly suited to low surface energy substrates like polypropylene (PP) and polyethylene (PE), which usually resist conventional adhesives.

Here are the primary areas of application:

• Industrial packaging: sealing cartons, attaching labels, assembling plastic films
• Plastic parts assembly: bonding PP, PE, TPO without prior surface treatment
• Automotive industry: attaching interior trim, door panels, and lightweight components
• Furniture and light carpentry: bonding edges, profiles, and decorative elements
• Electronics and wiring: securing cables, protecting sensitive components

Its application temperature of around 177 °C makes it compatible with most standard hot melt glue guns.

The formed bond offers good resistance to heat and humidity, making it suitable for demanding industrial environments.

Compared to conventional EVA hot melt adhesives like 3M 3762, the 3748 stands out for its ability to adhere to untreated plastics where EVAs struggle to maintain a lasting bond.

Thermal resistance: at what temperature does the 3M 3748 hold?

The 3M 3748 hot melt adhesive is formulated with a polyolefin base. It offers superior thermal resistance compared to the majority of standard hot melt adhesives.

Its continuous service temperature is around 80 °C. Occasional peaks up to 100 °C are tolerable without significant debonding.

Below zero, it maintains its hold. Cold resistance extends down to approximately -40 °C, making it suitable for refrigerated environments or outdoor applications.

For comparison, a standard EVA hot melt adhesive begins to soften at just 60-70 °C. The 3748 therefore gains about twenty degrees on this criterion, which makes a significant difference in a hot workshop or near a heat source.

Product	Chemical base	Max. service temp.	Cold resistance	Typical usage
3M 3748	Polyolefin	~80 °C (peaks 100 °C)	down to -40 °C	Industry, electronics, automotive
3M 3762	EVA	~60 °C	~-20 °C	Packaging, light assembly
Henkel Technomelt PA 6208	Polyamide	~120 °C	~-30 °C	Automotive under-hood, high temp.

The 3M 3748 thus positions itself in an intermediate range: more resistant than an EVA, without reaching the level of a polyamide. A good compromise for most common industrial applications.

Comparison: 3M 3748 versus other hot melt adhesives on the market

The 3M 3748 is a versatile polyolefin-based hot melt adhesive. It stands out for its good adhesion on difficult materials and its heat resistance.
But how does it compare to other references on the market? Here is a direct comparison.

Comparison table of the main industrial hot melt adhesives

Product	Manufacturer	Chemical base	Application temp.	Thermal resistance	Strengths	Typical applications
3M 3748	3M	Polyolefin	~190 °C	Up to 80 °C	Adhesion to PP, PE, difficult surfaces	Packaging, plastic assembly, electronics
3M 3764	3M	EVA	~177 °C	Up to 60 °C	Good general adhesion, controlled cost	Cardboard, wood, textile
3M 3792	3M	Low-temp EVA	~121 °C	Up to 50 °C	Heat-sensitive applications	Artificial flowers, fragile materials
Technomelt PA 648	Henkel / Loctite	Polyamide	~200 °C	Up to 130 °C	High thermal and chemical resistance	Automotive, high-temp electronics
Bostik 4450	Bostik	EVA	~180 °C	Up to 60 °C	Versatility, good hold on wood and paper	Carpentry, packaging, bookbinding

The 3M 3748 occupies a clear niche: it outperforms standard EVA formulations on low surface energy plastics (PP, PE) without reaching the costs and complexity of high-temperature polyamide adhesives.

It is the right choice when you want reliability and versatility without over-specifying the solution.

Limitations and safety precautions for 3M 3748 hot glue

The 3M 3748 hot melt adhesive offers excellent performance, but it has its limits. Knowing them avoids unpleasant surprises in production.

Its thermal resistance is limited to approximately 60-70 °C in continuous service. Beyond this, the bond softens and loses its cohesion. It is therefore not suitable for assemblies exposed to prolonged heat.

Very smooth or greasy surfaces pose a problem. Untreated polypropylene, PTFE, or oily surfaces drastically reduce adhesion. Careful degreasing remains essential before application.

The 3748 is not designed for structural assemblies under high mechanical stress. For high tensile or shear forces, an epoxy or polyurethane adhesive would be more appropriate.

Safety precautions to observe:

• Work in a well-ventilated space, hot fumes can irritate the respiratory tract
• Wear heat-resistant gloves: molten glue exceeds 160 °C as it leaves the gun
• Never leave the gun heating for a long time without use, the glue will degrade
• Avoid contact with damp surfaces at the time of application
• Store sticks away from moisture and extreme temperatures

The open time is short, just a few seconds. The positioning of the parts must be prepared in advance to guarantee precise assembly.

FAQ - 3M 3748 Hot Melt Adhesive

1. At what temperature does the 3M 3748 glue work?

The 3M 3748 is a polyolefin-based hot melt adhesive designed to be applied at high temperature, around 190 °C.

It offers a good service hold up to approximately 80 °C, making it suitable for moderately hot industrial environments.

2. On which materials can the 3M 3748 be used?

This adhesive adheres effectively to a wide range of substrates: wood, cardboard, foam, textiles, plastics, and certain metals.

It is particularly appreciated for bonding difficult materials like polyolefins (PP, PE), which are often poorly handled by standard glues.

3. What is the difference between the 3M 3748 and the 3M 3779?

The 3M 3779 is formulated for heat-sensitive substrates and is applied at a lower temperature (about 150 °C).

The 3M 3748, on the other hand, reaches higher temperatures and offers superior thermal resistance in service. It is better suited for demanding industrial applications.

4. Is the 3M 3748 compatible with all glue guns?

It comes in standard stick form, compatible with most professional high-temperature hot melt guns.

Verify that your gun supports an application temperature of at least 190 °C before use.

5. What is the setting time for the 3M 3748 adhesive?

The setting is fast: a few seconds after application, the glue begins to solidify as it cools.

This is a major advantage in industrial production, as it reduces downtime for parts and accelerates throughput.

6. Is the 3M 3748 moisture resistant?

Yes, the polyolefin formulation of the 3M 3748 gives it good resistance to moisture and common chemical agents.

It is therefore suitable for applications exposed to humid or slightly aggressive environments, such as food packaging or the furniture industry.