3M™ Scotch-Weld™ DP6310NS Urethane Composite Adhesive

3M Scotch-Weld DP6310NS Polyurethane Adhesive: High-performance two-part adhesive for composites and multi-material bonding

3M Scotch-Weld DP6310NS polyurethane adhesive is a two-part adhesive designed for demanding assemblies on composites, metals, and multi-material substrates.

Its non-sagging formulation holds on vertical surfaces without running, making it ideal for structural applications in the workshop or on-site.

Flexible after polymerization, it absorbs mechanical stresses and vibrations without compromising the joint.

A solid choice for professionals who refuse to compromise on bond strength.

Introducing the 3M Scotch-Weld DP6310NS: A two-part polyurethane adhesive designed for demanding assemblies

The 3M Scotch-Weld DP6310NS is a two-part polyurethane adhesive formulated to meet the constraints of modern industrial assemblies. It is specifically targeted at composite materials, plastics, and multi-material assemblies subject to significant mechanical loads.

At Dagobert Industrie, we offer this adhesive to professionals looking for a reliable solution without compromising on long-term durability.

Composition and working principle of the adhesive

The adhesive relies on a chemical reaction between two components: a polyurethane resin and a hardener. Mixing occurs directly at the nozzle exit, via a dual-cartridge and a static mixing nozzle.

This principle ensures precise and repeatable dosing for every application. No weighing, no ratio errors: mixing is automatic.

Once polymerized, the adhesive forms a flexible, impact- and vibration-resistant joint. This is a decisive advantage for assemblies subject to dynamic loads.

The NS (No Sag) designation indicates that the formulation does not run after application. It stays in place on vertical or inclined surfaces, simplifying work in both the workshop and on-site.

Technical properties and key features of the DP6310NS

The 3M Scotch-Weld DP6310NS is a two-part, auto-mixing polyurethane adhesive. It offers high mechanical strength on a wide range of materials, including composites, plastics, metals, and wood.

Its mixing ratio is 2:1 (A:B). Application is performed using a dual-cartridge with a static mixing nozzle, ensuring perfect homogeneity for every use.

The working time is approximately 25 minutes at 23 °C. Full cure is achieved in 24 hours. This lead time allows for adjustments after application, a practical advantage in the workshop.

The DP6310NS is formulated solvent-free (NS = Non-Solvant). It is suitable for environments where VOC emissions must remain low, such as confined spaces or certified production lines.

Here are its main technical characteristics:

• Tensile strength: approximately 20 MPa
• Elongation at break: up to 50%, good residual flexibility
• Operating temperature range: -40 °C to +80 °C
• Color after polymerization: beige / translucent
• Resistance to shocks and vibrations: excellent
• Adhesion to difficult materials: CFRP, SMC, ABS, steel, aluminum

Compared to a classic rigid epoxy adhesive (such as 3M Scotch-Weld DP460), the DP6310NS absorbs dynamic loads better due to its polyurethane nature. It is less rigid but much more tolerant to deformation and repeated impacts.

Compatible materials and application areas for the 3M DP6310NS polyurethane adhesive

The 3M Scotch-Weld DP6310NS is formulated to bond difficult materials, often incompatible with each other. This is its core strength.

It adheres to a wide range of composite materials: fiberglass, carbon fiber, SMC, BMC. These substrates are common in the industrial and transport sectors.

It also works very well on engineering plastics (ABS, polycarbonate, polyester) and on treated or painted metals. Multi-material assemblies, for example, metal to composite, are its specialty.

The following are the most common application areas:

• Automotive industry: bonding body panels, structural reinforcements, trim parts
• Industrial vehicles: truck cabs, bus bodies, agricultural equipment
• Marine: fiberglass hulls, bulkheads, decking
• Construction and building: sandwich panels, composite facades
• Leisure equipment: caravans, motorhomes, sports vehicles

Its flexibility after polymerization makes it particularly suitable for assemblies subject to vibrations or thermal expansion. It absorbs stresses without debonding.

At Dagobert Industrie, we recommend it whenever an application involves heterogeneous materials or demanding mechanical conditions.

Comparison: 3M Scotch-Weld DP6310NS vs. other structural polyurethane and epoxy adhesives

The market for two-part structural adhesives is vast. Epoxy, polyurethane, methacrylate acrylic: each family has its strengths. Here is where the DP6310NS stands.

The DP6310NS is a flexible polyurethane. It absorbs vibrations and shocks better than a classic rigid epoxy. This is its main advantage for multi-material and composite assemblies.

Compared to an epoxy like the 3M Scotch-Weld DP490, the DP6310NS offers better resistance to dynamic loads. In exchange, heat resistance and assembly stiffness remain superior on the epoxy side.

Compared to methacrylate acrylics (like 3M Scotch-Weld DP8005), the DP6310NS is more flexible but requires a clean surface. Acrylics tolerate slightly oily surfaces better.

Comparison table of main two-part adhesives for composites

Product	Chemistry	Flexibility	Impact Resistance	Thermal Resistance	Typical Applications
3M DP6310NS	Polyurethane	High	Excellent	Moderate (~80°C)	Composites, multi-material, bodywork
3M DP490	Epoxy	Low	Average	High (~120°C)	Rigid structures, metals, ceramics
3M DP8005	Methacrylate acrylic	Average	Good	Moderate (~90°C)	Plastics, composites, poorly prepared surfaces
Sika SikaPower-498	Modified Epoxy	Average	Very good	High (~110°C)	Automotive, mixed structural assemblies

The DP6310NS is the clear choice whenever the assembly is subject to vibrations, repeated flexing, or differential expansion. This is typically the case for composite panels, leisure vehicles, or marine structures.

Implementation tips and best practices

The 3M Scotch-Weld DP6310NS polyurethane adhesive is applied with a two-part gun adapted for dual-cartridges. The use of a static mixing nozzle is essential to homogenize both components before application.

Always purge a few centimeters of product before applying the actual bead. This ensures a correct mixing ratio from the very first deposit.

Carefully prepare the surfaces before bonding: dusting, degreasing with isopropanol or a suitable solvent, and, if necessary, light abrading for smooth substrates. On composites or plastics, surface activation (primer or plasma treatment) can significantly improve adhesion.

Observe the open time indicated by 3M before assembly. Once parts are positioned, maintain pressure until initial set, clamping tools or a simple jig suffice in most cases.

A few points of caution:

• Recommended application temperature: between 15 °C and 35 °C
• Do not expose the joint to mechanical loads before full cure (24 h at 23 °C)
• Change the mixing nozzle after every prolonged interruption
• Store the cartridge away from moisture and between 5 °C and 25 °C

For multi-material assemblies (metal/composite, plastic/foam), always test adhesion on a representative sample before mass production.

FAQ - 3M Scotch-Weld DP6310NS

1. On which materials is the DP6310NS effective?

The 3M Scotch-Weld DP6310NS is designed to bond difficult materials such as composites, plastics, metals, and mixed substrates.

It excels in multi-material assemblies where classic glues fail, particularly on low surface energy substrates.

2. What does "NS" mean in DP6310NS?

"NS" stands for Non Sagging. The formulation does not run on vertical or inclined surfaces.

This is a practical advantage on-site or in the workshop: you apply it, and it stays in place, with no touch-ups required.

3. What is the open time of this adhesive?

The DP6310NS has an open time of approximately 4 minutes at 23 °C. This lead time allows you to position the parts before polymerization begins.

Handling strength is reached in approximately 20 to 30 minutes. Full mechanical strength develops in 24 hours.

4. Is surface preparation required before bonding?

Yes. Careful degreasing is essential: use a suitable solvent, a lint-free cloth, and wipe in one direction.

On certain substrates (polyolefins, PTFE), a primer or plasma activation may be necessary to obtain optimal adhesion.

5. Does this glue resist dynamic mechanical stresses?

Yes. The DP6310NS offers excellent peel and impact resistance, thanks to its polyurethane base, which is flexible once cross-linked.

It absorbs vibrations and differential expansion, making it a relevant choice for assemblies subject to cyclic loads or harsh environments.

6. Can the DP6310NS be used with a standard applicator gun?

The DP6310NS comes in a two-part cartridge compatible with 3M pneumatic or manual guns, using a static mixing nozzle.

At Dagobert Industrie, we recommend verifying the mixing ratio compatibility (2:1) with your gun before use.