ARALDITE® AV 5308 / HARDENER HV 5309-2

• Toughened Paste
• Ideal for bonding GRP, SMC and dissimilar substrates
• Gap filling, non-sagging up to 10mm thickness
• Good resistance to weathering

Pre-treatment
The strength and durability of the adhesive bond are dependent on proper treatment of the surfaces to be bonded. At the very least, the surfaces should be cleaned with an effective degreasing agent such as acetone or other proprietary degreasing agents in order to remove all traces of oil, grease,dirt and other surface contaminants. Low Grade alcohol, gasoline (petrol) or paint thinners must never be used. The strongest and most durable bonded assemblies are obtained by either mechanically abrading or chemically etching (“pickling”) the degreased surfaces. Mechanical abrading should be followed by a second degreasing treatment.
Application of adhesive
The resin/hardener mix is applied manually or robotically to the pre-treated and dry joint surfaces. Huntsman’s technical support group can assist the user in the selection of a suitable application method as well as suggest a variety of reputable companies that manufacture and service adhesive dispensing equipment. A layer of adhesive 0.002 to 0.004-inches (0.05 to 0.10-mm) thick will normally impart the greatest lap shear strength to a joint. It should also be noted that bonded assembly design also critical in providing a durable bond. The components to be bonded together should be assembled and maintained in a fixed position as soon as the adhesive has been applied. For more detailed explanations regarding surface preparations and pre-treatment, assembly design, and the twin cartridge dispensing system.
Equipment maintenance
All tools should be cleaned with hot soapy water before the adhesive has cured. If solvents such as acetone are used for cleaning, operators should take all the necessary precautions in order to prevent eyes or skin contact.

Average handling shear strengths of typical primed aluminum to primed aluminum joints.

Panels degreased with IPA, cured and tested at 25°C (77°F).

Average lap shear strengths of typical metal to metal joints.

Panels degreased with IPA, cured 24 hours at 25°C (77°F) and tested at 25°C

Average lap shear strengths of typical plastic to plastic joints.

Panels lightly abraded and degreased with IPA, cured 7 days at 25°C (77°F) and tested at 25°C (77°F).

Average lap shear strength versus tropical weathering (40°C/92% Relative Humidity).

On primed aluminum panels. Panels degreased with IPA, cured 24 hours at 25°C (77°F) and tested at 25°C (77°F).

Average lap shear strength versus various conditions.

On primed aluminum panels. Panels degreased with IPA, cured 24 hours at 25°C (77°F), and tested at 25°C (77°F). Test method ASTM D-1002.

Average lap shear strength versus heat aging (70°C).

On primed aluminum panels. Panels degreased with IPA, cured 24 hours at 25°C (77°F) before aging and tested at 25°C (77°F).

Glass transition temperature (typical average values)
Cure: 1 hour at 80°C: 79°C by DMA

DMA Shear Modulus G’ (ISO 6721) (typical average values)
Cure: 1 hour at 80°C
-50°C: 1.8 GPa
0°C: 1 GPa
20°C: 900 MPa
50°C: 540 MPa
75°C: 61 MPa
100°C: 12 MPa

Flexural Properties (ISO 178)
Cure 16 hours at 40°C, tested at 23°C
Flexural Strength : 43 MPa
Flexural Modulus : 1800 MPa

Tensile properties (ISO 527)
Cure 16 hours at 40°C, tested at 23°C
Tensile Strength : 31 MPa
Tensile Modulus : 1.6 GPa
Elongation at break : 4.2%

• Araldite AV 5308 and Hardener HV 5309-2 must be stored at room temperature and the components must be stored in sealed containers. The expiry date is indicated on the label.
• These products are generally quite harmless to handle provided that certain precautions normally taken when handling chemicals are observed. The uncured materials must not, for instance, be allowed to come in contact with foodstuffs or food utensils, and measures should be taken to prevent the uncured materials from coming in contact with the skin, since people with particularly sensitive skin may be affected. The wearing of impervious rubber or plastic gloves will normally be necessary; likewise, the use of eye protection. The skin should be thoroughly cleansed at the end of each working period by washing with soap and warm water. The use of solvents is to be avoided. Disposable paper- not cloth towels- should be used to dry the skin. Adequate ventilation of the working area is recommended.