3M™ 3738 Hot Melt Adhesive

3M 3738 hot-melt adhesive: features, applications, and performance

The 3M 3738 hot-melt adhesive is a reliable benchmark for demanding bonding tasks in industry and craftsmanship. It offers rapid adhesion on a wide range of materials.

Formulated with a polyolefin base, it is heat-resistant and guarantees a strong and durable bond, even on difficult surfaces such as wood, plastics, or textiles.

Available at Dagobert Industrie, it is the effective choice for your everyday hot-melt bonding applications.

What is 3M 3738 hot-melt adhesive?

The 3M 3738 hot-melt adhesive is a polyolefin-based adhesive applied hot using a glue gun. It melts under heat, flows onto the substrate, and then solidifies upon cooling to form a strong bond.

It is a versatile glue designed for industrial and craft assemblies that require good mechanical strength and fast application.

Composition and form of 3M 3738 glue

3M 3738 is formulated with a thermoplastic polyolefin base. This composition gives it excellent adhesion on a wide range of materials, including low-surface-energy materials, which are often difficult to bond.

It comes in the form of cylindrical sticks, compatible with standard hot glue guns. Its application is clean, solvent-free, and requires no chemical drying time.

Among its key features:

• Application temperature: approximately 190 °C
• Open time: short, allowing for quick positioning of parts
• Resistance to moisture and many chemical agents
• Compatible with wood, plastics, metal, foams, and textiles
• Solvent-free, VOC-free

At Dagobert Industrie, we offer this 3M product for professionals seeking a reliable, fast, and industrial-grade hot-melt adhesive.

Technical properties and performance of 3M 3738

The 3M 3738 is a versatile hot-melt adhesive formulated with an EVA copolymer base. It melts at a low temperature and provides a quick set, making it ideal for timed production lines.

Its application temperature ranges between 177 °C and 204 °C. The open time is short, approximately 15 to 30 seconds depending on conditions, which ensures a solid assembly without long waiting times.

It develops excellent adhesion on a wide range of substrates: cardboard, wood, fabric, foam, certain plastics, and porous materials. This is a major asset for multi-material applications.

The 3738 shows good resistance to impact and flexing once cooled. It remains flexible, which prevents debonding on assemblies subjected to vibrations or light mechanical stress.

Here are its main technical specifications:

• Chemical base: EVA (ethylene-vinyl acetate)
• Application range: 177-204 °C
• Color: natural / translucent
• Open time: short (approx. 15-30 s)
• Compatible substrates: cardboard, wood, fabric, foam, porous plastics
• Form: glue gun stick

Product	Chemical base	App. temp.	Open time	Main use
3M 3738	EVA	177-204 °C	Short	Multi-material assembly, cardboard, wood, fabric
3M 3748	High-perf EVA	177-204 °C	Very short	High-strength bonds, difficult surfaces
3M 3792	Low-temp EVA	121-149 °C	Medium	Heat-sensitive materials, foams, textiles
Henkel Technomelt PA 6792	Polyamide	190-220 °C	Short	High thermal resistance industrial assemblies

Areas of application and compatible materials

The 3M 3738 hot-melt adhesive is designed for the fast and strong bonding of a wide range of materials. It is suitable for both industrial and craft applications.

Its polyolefin-based formula gives it excellent adhesion on difficult surfaces, particularly low-surface-energy plastics.

Compatible materials:

• Wood, particleboard, plywood
• Plastics: polypropylene (PP), polyethylene (PE), ABS, PVC
• Metals (steel, aluminum)
• Textiles and non-wovens
• Foams and porous materials
• Cardboard and paper

The application sectors covered are numerous: packaging, furniture, automotive, electronics, leather goods, and crafts.

It is particularly appreciated for assembling lightweight components, attaching seals, bonding interior trim, or securing cables.

Product	Chemical base	Target materials	Melting point	Typical usage
3M 3738	Polyolefin	PP, PE, wood, metal, textile	~190 °C	General purpose, low-energy plastics
3M 3748	EVA	Wood, cardboard, fabric	~177 °C	Packaging, furniture
3M 3792	Clear EVA	Glass, metal, plastic	~190 °C	Transparent bonding, electronics
Henkel Technomelt PA 6792	Polyamide	Metals, technical plastics	~200 °C	Automotive industry, high temperature

Comparison: 3M 3738 hot-melt adhesive versus other market standards

The 3M 3738 hot-melt adhesive stands out for its high-performance polyamide formulation. It offers excellent heat resistance and good holding power on difficult materials.

To put this product in context, here is a comparison with other common market references:

Product	Manufacturer	Chemical base	App. temp.	Thermal resistance	Typical applications
3738	3M	Polyamide	~190 °C	Up to 120 °C	Industrial assembly, textile, filtration
3748	3M	Polyamide	~190 °C	Up to 120 °C	Structural bonds, porous materials
3762	3M	EVA	~177 °C	Up to 60 °C	Packaging, creative arts, general purpose
Technomelt Q 1246	Henkel	Polyamide	~200 °C	Up to 130 °C	Electronics, precision assembly
Bostik HM 0670	Bostik	EVA	~160 °C	Up to 50 °C	Light packaging, cardboard

The polyamide base of the 3738 gives it a clear advantage over EVA glues in hot or humid environments.

Compared to the 3M 3748, the 3738 features a slightly longer open time, which facilitates assembly on large surfaces or complex parts.

Against Henkel polyamide formulas, the 3738 remains a solid choice for common industrial applications without requiring such high temperatures.

At Dagobert Industrie, we recommend the 3738 for any use combining moderate thermal stress with a need for reliable adhesion on varied materials.

Usage tips and optimal application conditions

The 3M 3738 hot-melt adhesive is used with a compatible glue gun set to a melting temperature between 190 °C and 210 °C. Respecting this range ensures optimal viscosity and good surface wetting.

Before application, surfaces must be clean, dry, and degreased. Any trace of dust, oil, or moisture reduces adhesion and weakens the bonded joint.

Apply the glue in a regular bead, then assemble the parts quickly: the open time is short, on the order of a few seconds at room temperature. Maintain pressure on the parts for 30 to 60 seconds until completely solidified.

The final strength of the joint is reached after returning completely to room temperature. Avoid any premature mechanical stress on the assembly.

3M 3738 is particularly suitable for porous or semi-porous substrates: wood, cardboard, fabric, foam, certain plastics. It is less suitable for very smooth surfaces or those with a high plasticizer content.

Store glue sticks in a dry place, away from heat and moisture, to preserve their properties over time.

• Recommended gun temperature: 190-210 °C
• Surfaces: clean, dry, degreased
• Assembly: immediate after application
• Pressure maintenance: 30 to 60 seconds
• Ideal substrates: wood, cardboard, textile, foam

FAQ - 3M 3738 hot-melt adhesive

1. At what temperature should 3M 3738 adhesive be applied?

The 3M 3738 hot-melt adhesive is used with a glue gun set to high temperature, generally between 177 °C and 204 °C.

Below this range, the glue will not melt properly and adhesion will be insufficient. Always follow the manufacturer's instructions.

2. On which materials does 3M 3738 adhere effectively?

The 3738 is formulated to bond a wide spectrum of materials: wood, cardboard, plastics, foams, textiles, and metals.

It excels particularly in mixed assemblies, where other glues struggle to grip two surfaces of different natures.

3. What is the difference between 3M 3738 and 3M 3748?

The 3M 3748 offers superior thermal resistance once applied, making it suitable for applications exposed to heat during service.

The 3M 3738, meanwhile, focuses on excellent initial adhesion and great versatility on varied materials. It is the default choice for most common assemblies.

4. Is the 3M 3738 glue line moisture-resistant?

Yes. Once cooled, the bead offers good moisture resistance, making it suitable for slightly humid environments.

However, for prolonged immersion or permanent contact with water, a waterproof structural adhesive would be more appropriate.

5. Can 3M 3738 be used with any glue gun?

3M 3738 glue comes in standard sticks compatible with the majority of high-temperature glue guns on the market.

At Dagobert Industrie, we recommend checking the stick diameter (usually 12 mm or 15 mm) to ensure compatibility with your gun.

6. What is the open time of 3M 3738 adhesive?

The open time, that is, the time available to position parts before the glue sets, is short, on the order of a few seconds to about thirty seconds.

This is a key point to anticipate: prepare the assembly before applying the glue so as not to miss the bonding window.