ARALDITE® AW 4804 / HARDENER HW 4804

• Excellent heat resistance up to 210 °C after post-cure
• Self levelling
• Good environmental resistance
• Long pot life

• The resin/hardener mix may be applied manually or robotically to the pretreated and dry joint surfaces. 
• Huntsman stresses that proper adhesive joint design is critical for a durable bond.
• The joint components should be assembled and secured in a fixed position as soon as the adhesive has been applied.

Typical Cured Properties

• Unless otherwise stated, the figures given below were all determined by testing standard specimens made by lap-jointing 114 x 25 x 1.6 mm strips of aluminium alloy. The joint area was 12.5 x 25 mm in each case.
• The figures were determined with typical production batches using standard testing methods. They are provided solely as technical information and do not constitute a product specification.

Average lap shear strengths of typical metal-to-metal joints (ISO 4587) (typical average values)

• Cured 2h/120°C
• Pretreatment - Sand blasting + degreasing

Lap shear strength versus temperature (ISO 4587) (typical average values)

• Cured for 2h/120 °C
• Pretreatment - Sand blasting + degreasing

Lap shear strength versus immersion in various media (ISO 4587) (typical average values)

• Unless otherwise stated, L.S.S. was determined after immersion for 90 days at 23°C
• Cure 2 hours at 120°C
• Pretreatment - Sand blasting + degreasing

Lap shear strength versus heat ageing (ISO 4587) (typical average values)

• Cure: 16 hours at 40°C
• Pretreatment - Sand blasting + degreasing

Typical Mechanical Properties

Glass Transition Temperature (Tg) by DSC

Pretreatment

• The strength and durability of a bonded joint are dependent on proper treatment of the surfaces to be bonded.
• At the very least, joint surfaces should be cleaned with a good degreasing agent such as acetone or other proprie- tary degreasing agents in order to remove all traces of oil, grease and dirt. Low-grade alcohol, gasoline (petrol) or paint thinners should never be used.
• The strongest and most durable joints are obtained by either mechanically abrading or chemically etching (“pick- ling”) the degreased surfaces.
• Abrading should be followed by a second degreasing treatment.

Equipment maintenance

• All tools should be cleaned with hot water and soap before adhesives residues have had time to cure.
• The removal of cured residues is a difficult and time-consuming operation.
• If solvents such as acetone are used for cleaning, operatives should take the appropriate precautions and, in addition, avoid skin and eye contact.

Typical cure requirements

• To achieve optimum performance properties an elevated temperature cure is recommended. This adhesive will not reach sufficient cure at temperatures below 100°C.
• Suggested cure schedules are:
• 2h at 120°C
• 1h at 150°C
• 1h at 120°C + 1h at 180°C

       Storage

• Araldite® AW 4804 and Hardener HW 4804 must be stored at 2-18°C in the original sealed containers.

       Handling Precautions

• Our 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 into contact with food- stuffs 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. Disposa- ble paper - not cloth towels - should be used to dry the skin.
• Adequate ventilation of the working area is recommended.