Araldite 2029-1 Two-Component Gap-Filling Polyurethane Structural Adhesive

Araldite® 2029-1 is a two-component, cold-curing polyurethane structural adhesive from Huntsman Advanced Materials, consisting of a grey resin component (Component A) and a beige hardener component (Component B). Designed specifically for metal structural bonding, this product offers excellent gap-filling capability, medium open time, and high strength, with good adhesion to metals including copper and brass. The mixed adhesive is a dark grey paste, suitable for industrial applications requiring rigid structural joints.

• Gap-filling capability: Suitable for uneven surfaces or joints with gaps; paste consistency prevents sagging after mixing

• Medium open time: 40 minutes (25°C, 10 g) working time for application adjustment

• High strength on metals: Excellent lap shear strength (>15 MPa) on aluminum, steel, stainless steel, etc.

• Adhesion to copper and brass: Good bonding performance on copper and brass surfaces

• Cold curing: Cures without heating, suitable for heat-sensitive substrates

• Rigid structural adhesive: Forms a rigid bond line after curing, ideal for load-bearing structural applications

• Dual cartridge format: Available in cartridges with mixers, ready to use with Huntsman-recommended tools

Mix Ratio:

Cure Time to Minimum Shear Strength (laboratory conditions: 40–60% RH):

Typical Cured Properties (cured 16 h at 40°C):

Typical Lap Shear Strength (ISO 4587, cured 16 h at 40°C, tested at 23°C):

Metal substrates (sand blasting):

• Aluminum: ~24 MPa

• Steel 37/11: ~24 MPa

• Stainless steel V4A: ~23 MPa

• Galvanised steel: ~19 MPa

• Copper: ~21 MPa

• Brass: ~18 MPa

Plastic substrates (lightly abrade + isopropanol degrease):

• CFRP: ~27 MPa

• EP-GRP*: ~24 MPa

• UP-GRP*: ~11 MPa

• SMC*: ~6 MPa

• ABS*: ~6 MPa

• PA 6.6: ~4 MPa

• PC*: ~6 MPa

• PMMA: ~4 MPa

• PVC: ~5 MPa
  ( denotes substrate failure)

Chemical Resistance (aluminum, immersion at 23°C, unless otherwise stated):

• Lubricating oil: 30 days ~25+ MPa; 90 days ~23 MPa

• Paraffin: 30 days ~23 MPa; 90 days ~24 MPa

• Water at 23°C: 30 days ~17 MPa; 90 days ~8 MPa

• Water at 60°C: 30 days ~12 MPa; 90 days ~9 MPa

• Water at 90°C: 30 days ~8 MPa; 90 days ~2 MPa

• Acetic acid, 10%: 30 days ~14 MPa; 90 days ~2 MPa

• Xylene: 30 days ~16 MPa; 90 days ~11 MPa

• Ethyl acetate: 30 days ~2 MPa; 90 days ~1 MPa

• Fuel (unleaded): 30 days ~16 MPa; 90 days ~18 MPa

• IMS: 30 days ~15 MPa; 90 days ~5 MPa

Weathering & Heat Ageing (aluminum):

• Tropical weathering (40°C/92% RH): As-made ~24 MPa; 30 days ~17 MPa; 60 days ~12 MPa; 90 days ~13 MPa

• Heat ageing at 70°C: As-made ~24 MPa; 30 days ~27 MPa; 60 days ~31 MPa; 90 days ~28 MPa

• Thermal cycling (−30°C to 70°C, 100 cycles): 27 MPa

Storage:
Store in original sealed containers at 2021-25°C. Expiry date is indicated on the label.

• Metal structural bonding: Structural joining of aluminum, steel, stainless steel, and galvanized steel components

• Copper and brass assemblies: Suitable for electrical, HVAC, or decorative components requiring copper or brass bonding

• Composite bonding: Structural joining of CFRP, EP-GRP composites (note substrate failure modes)

• Industrial assembly: Machinery, equipment, and metal structure assembly requiring gap filling and medium working time

• Heat-sensitive applications: Cold-curing nature suits substrates or on-site work where heating is impractical

• Dual-cartridge application: With mixers and Huntsman-recommended tools, ideal for batch or on-site bonding

1. Surface pretreatment: Clean with a good degreasing agent such as acetoner or isopropanol to remove oil, grease, and dirt. Low-grade alcohol, gasoline, or paint thinners should never be used. The strongest and most durable joints are obtained by mechanical abrading or chemical etching ("pickling") followed by a second degreasing treatment.

2. Mixing: Weight ratio A:B = 100:82; volume ratio A:B = 100:100. Cartridges with mixers can be used as ready-to-use adhesive with Huntsman-recommended tools.

3. Application: Apply manually or robotically to pretreated and dry joint surfaces. A layer of 0.05–0.10 mm thickness normally imparts the greatest lap shear strength.

4. Assembly: Assemble and secure joint components in a fixed position as soon as the adhesive has been applied.

5. Cleaning: Clean tools with hot water and soap before adhesive residues cure. Removal of cured residues is difficult and time-consuming. When using solvents such as acetoner, take appropriate precautions and avoid skin and eye contact.

Q1: What is the mix ratio of Araldite® 2029-1?

Weight ratio A:B = 100:82; volume ratio A:B = 100:100.

Q2: What is the pot life?

Pot life is approximately 40 minutes for 10 g at 25°C. Higher temperatures will shorten the pot life.

Q3: How long does it take to cure?

Cure speed depends on temperature. At 23°C, it takes about 70 minutes to reach >1 MPa shear strength and about 8 hours to reach >10 MPa; at 40°C, about 25 minutes to >1 MPa and about 4 hours to >10 MPa. For full cure, 16 hours at 40°C is recommended (typical property test condition).

Q4: Which metals does it bond with high strength?

Good lap shear strength on aluminum, steel 37/11, stainless steel V4A, galvanized steel, copper, and brass (typical values ~18–24 MPa, sandblasted, cured 16 h at 40°C).

Q5: What bond line thickness is recommended?

A layer of 0.05–0.10 mm thickness normally imparts the greatest lap shear strength.

Q6: How to clean uncured adhesive?

Clean tools with hot water and soap before residues cure. Removal of cured residues is difficult and time-consuming. When using solvents such as acetoner, take appropriate precautions and avoid skin and eye contact.

Q7: Storage conditions and shelf life?

Store in original sealed containers at 2021-25°C. Expiry date is indicated on the label.

Q8: Is it suitable for plastic bonding?

It provides certain bond strength on composites such as CFRP and EP-GRP (typically ~24–27 MPa, though some are substrate failures); strength on UP-GRP, SMC, ABS, PC, PVC is lower (~5–11 MPa), mostly substrate failure. Testing is recommended for specific plastic types.

Q9: How does it perform in water immersion?

After 90 days immersion in water at 23°C, lap shear strength is about 8 MPa; at 60°C about 9 MPa; at 90°C about 2 MPa. Long-term high-temperature water exposure requires careful evaluation.

Q10: Can it be used on site?

Yes. The product is available in cartridges with mixers and can be applied as ready-to-use adhesive with Huntsman-recommended tools, suitable for on-site work. Surface pretreatment must still be performed properly.

Uncured materials must not come into contact with foodstuffs or food utensils, and measures should be taken to prevent skin contact, as people with particularly sensitive skin may be affected. Impervious rubber or plastic gloves and eye protection are normally necessary. Cleanse skin thoroughly at the end of each working period with soap and warm water; avoid solvents. Use disposable paper towels (not cloth) to dry skin. Adequate ventilation of the working area is recommended. Refer to the Material Safety Data Sheets for fuller information.