Aluminium Bonding: ACROBOND® PU 211/30 EF

Designed for aluminium joinery, ACROBOND® PU 211/30 EF is a CMR-free two-component polyurethane adhesive, formulated to reconcile productivity, operator safety, and mechanical holding power.

With a controlled open time and clean application in 1:1 cartridges, it meets the requirements of workshops (corners, brackets, connections) by easily integrating into existing processes.

 

What is ACROBOND® PU 211/30 EF?

 

It is a thixotropic two-component PU dedicated to the assembly of aluminium profiles and accessories (doors, windows, chassis). The formulation emphasises safety of use (CMR-free, no SGH08 pictogram) and reaction kinetics adapted to assembly and positioning operations.

The adhesive is also suitable for associated substrates (HPL, GRP, honeycomb panels) subject to validation testing.

 

Why Choose ACROBOND® PU 211/30 EF?

 

Designed for aluminium joinery, PU 211/30 EF combines regulatory safety, workshop workability, and mechanical holding power adapted to corner assemblies. It facilitates clean and reproducible workflows without sacrificing performance. The points below summarise key benefits, before application precautions.

Product Benefits

  • Safety & Compliance: CMR-free formulation, no SGH08 pictogram; exempt from mandatory diisocyanate training (REACH) linked to the formulation.
  • Controlled Process: Open time ~20 min at 20°C, initial holding ≈ 2 h, final cure 24 h → balance between workability and production rate.
  • Mechanical Strength: Firm and cohesive joint, Shore D ≈ 73, tensile/shear resistance ≈ 17 N/mm² (robust orientation for corner assemblies).
  • Clean Application: Thixotropy for vertical beads/injection into cavities; easy-to-use 1:1 cartridges.
  • User Comfort: Solvent-free and very low emissions → simplified working environment.

Points of Attention

  • Methodical Surface Preparation: Chemical cleanliness, controlled abrasion, management of aluminium oxides, primer if required.
  • Respect Assembly Conditions: Temperature, humidity, and 1:1 volumetric mixing with an adapted static mixer.
  • Material/Process Qualification: Preliminary tests according to profiles, coatings (anodising, lacquering), and gap filling.

 

Application Fields

 

  • Aluminium Joinery: PU 211/30 EF secures the bonding of corner brackets and connections: precise holding, respected square geometry, and clean joints, including in vertical application.
  • Technical Works: For large-format opening elements or high-inertia doors, the final hardness and shear resistance provide rigidity whilst absorbing micro-deformations.
  • Technical Panels & Cladding: For honeycomb/GRP/HPL panels integrated into aluminium assemblies, the thixotropic nature favours consistent bead application or filling, subject to validation.

 

Sectoral Use Cases

 

1) Aluminium Chassis Corners (Doors/Windows): The adhesive ensures reproducible positioning of brackets and a strength build-up compatible with standard workshop flows. Rework and adjustments decrease, perceived quality increases.

2) Technical Panels & Cladding: For lightweight panels (honeycomb/GRP/HPL) integrated into aluminium assemblies, thixotropy limits sagging/running, and the 24-hour cure guarantees stable performance after controlled handling.

 

Comparison (Summary): ACROBOND® PU 211/30 EF vs Epoxy/MMA

 

Criterion

PU 211/30 EF

2K Epoxy

2K MMA

Safety

CMR-free, no SGH08; no diisocyanate training*

Variable depending on systems

Strong odour, exotherm/rapid curing

Workability

Open time ≈ 20 min, holding ≈ 2 h

Variable (10–60 min)

Often short (5–15 min)

Application

Thixotropic, injection/cavity filling possible

Variable

Generally more fluid

Alu Holding

Very Good (corners, profiles)

Excellent on prepared alu

Excellent on metals

Aesthetics

Clean beads, low shrinkage

Low shrinkage

Low to moderate shrinkage

Key Takeaway: PU 211/30 EF offers a workability/safety compromise particularly adapted to aluminium joinery, whereas MMA prioritises speed and epoxy focuses on high performance/rigidity after curing.

 

Choosing Your Reference and Packaging

 

The choice of the correct reference and packaging is always made in light of the actual process: speed, workshop temperature, assembly geometry, and application means. The goal is to obtain a controlled and reproducible bead, compliant with HSE constraints and quality requirements, without penalising cycle times.

  • Kinetics: Validate the suitability of 20 min/2 h/24 h to the production rate and workshop temperature.
  • Geometry & Gaps: Dimension bead width/thickness; foresee spacers if needed.
  • Process & Tooling: Cartridges 2×190 ml (380 ml) and 2×310 ml (620 ml), 1:1 ratio; compatible pneumatic dispenser guns; static mixer according to viscosity and targeted flow rate.
  • Controls: Batch traceability, visual dimensional check, validation specimens.

 

ACROM Solutions

 

At ACROM, we support process definition (preparation, parameters, quality control) and workshop implementation (choice of dispenser guns/mixers, workstation organisation). We offer PU 211/30 EF and auxiliaries (primers adapted to aluminium, cleaners, consumables) with testing support to qualify your profiles, finishes, and assemblies.

Need technical framing? We produce a testing protocol, corner samples, and a feedback report with process and HSE recommendations.

 

Best Usage Practices

 

Above all, surface preparation conditions long-term holding: it is often half the success of a bond. Defining a standard (adapted degreasing, controlled abrasion, removal of oxides, dust removal, primer if required) and documenting it guarantees reproducibility.

  • Controlled Preparation: Chemical cleanliness, controlled roughness, management of aluminium oxides.
  • Reproducible Application: Dimensioned beads, marked assembly pressure/holding times, assured 1:1 mixing.
  • In-Line Quality: Jigs/spacers for gaps, monitoring of open time/Temp/RH, recording of batches and parameters.

 

Safety & Compliance

 

The CMR-free formulation without SGH08 pictogram simplifies HSE management. Regarding the REACH restriction on diisocyanates (mandatory training for > 0.1% since 24 August 2023), PU 211/30 EF exempts your teams from this training* while offering a high level of safety. (Always refer to SDS and local regulations.)

*Subject to applicable texts and usage compliant with the SDS.

 

FAQ

 

Is diisocyanate training required to use PU 211/30 EF?

No, the formulation is designed for training exemption (REACH restriction); refer to texts and the SDS.

What is the open time?

Approximately 20 minutes at 20°C; initial holding ≈ 2 hours; final cure 24 h.

Which materials does it adhere to?

Primarily aluminium (profiles, accessories), with possibilities for HPL, GRP, honeycomb panels, and certain exterior accessories after testing.

What packaging formats?

2×190 ml (380 ml) and 2×310 ml (620 ml) in 1:1, compatible with pneumatic dispenser guns and static mixers.

Can we paint after bonding?

Yes, respecting curing times and cycle compatibility (powder coating, lacquering).

 

About ACROM & Contact

 

As a specialist in industrial adhesives, ACROM supports you from feasibility study to production ramp-up: product choice, preparation, application parameters, quality control.

Contact our teams for a material test on your aluminium profiles and a workshop process framing.