ARALDITE® AW 139-1 / HARDENER HV 998-1

• Excellent chemical resistance
• Temperature resistant to 120°C
• Thixotropic, gap filling paste

• The resin/hardener mix may be applied manually or robotically to the pretreated 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 0.05 to 0.10 mm thick will normally impart the greatest lap shear strength to the joint.
• Huntsman stresses that proper adhesive joint design is also 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 170 x 25 x 1.5 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 for 16 hours at 40°C and tested at 23°C
• Pretreatment - Sand blasting and degreasing

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

• Cured for 16 hours at 40°C and tested at 23°C.
• Pretreatment - Lightly abrade and alcohol degrease.

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

• Cure: 7 days / 23°C or 24 hours / 23°C + 30 minutes / 80°C

Glass transition temperature (DMA) (ISO 6721) (typical average value)

• Cure: 16 hours / 40°C : 68°C

Shear modulus (DMA) (ISO 6721) (typical average values)

• Cure: 16 hours / 40°C

Tensile properties (ISO 527) (typical average values)

• Cure: 16 hours / 40°C and test at 23°C

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

• Unless otherwise stated, LSS was determined after immersion for 30, 60 and 90 days at 23°C
• Cure: 16 hours at 40°C

Lap shear strength versus tropical weathering (typical average values)

• 40°C / 92% Relative humidity
• Cure: 16 hours / 40°C and test at 23°C

Lap shear strength versus heat ageing (typical average values)

• Cure: 16 hours / 40°C

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 proprietary 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 (“pickling”) 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.

Times to minimum shear strength

LSS = Lap shear strength.

Storage

• Araldite® AW 139-1 and Hardener HV 998-1 must be stored at room temperature and the components must be stored in 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 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.