ARALDITE® AW 139-1 / HARDENER HV 998

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

• The resin/hardener mix is applied with a spatula, to the pretreated and dry joint surfaces.
• A layer of adhesive 0.05 to 0.10 mm thick will normally impart the greatest lap shear strength to the joint.
• The joint components should be assembled and clamped as soon as the adhesive has been applied.
• An even contact pressure throughout the joint area will ensure optimum cure.

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 for 16 hours at 40°C and tested at 23°C.
• Pretreatment - Sand blasting

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

• Cured at 40°C for 16 hours and measured at 23°C. Pretreatment - lightly sanded and degreased with alcohol.

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

• Curing: (a) = 7 days at 23°C; (b) = 24 hours at 23°C + 30 minutes at +80°C

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

• Unless otherwise stated, LSS was determined after immersion at 23°C for 90 days.
• Curing at 40°C for 16 hours

Lap shear strength vs. tropical weathering

• (40°C / 92% relative humidity, DIN 50015, typical average value)
• Curing: 16 hours/40°C Measurement: at 23°C

Lap shear strength vs. thermal aging (typical average values)

• Curing: 16 hours/40°C

Pretreatment

• The strength and durability of a bonded joint are dependant 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, iso-propanol (for plastics) 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

• Resin and hardener should be blended until they form a homogeneous mix.
• Resin and hardener are also available in cartridges incorporating mixers and can be applied as ready-to-use adhesive.

Mechanical processing

• Specialist firms have developed metering, mixing and spreading equipment that enables the bulk processing of adhesive.

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.

Minimum recommended cure cycles

LSS = Lap shear strength.

       Storage

• ARALDITE® AW 139-1 / HV 998 should be stored at room temperature with the contents sealed. The expiration date is indicated on the label.

       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.