ARALDITE® AW 146 / HARDENER HV 957

• High shear and peel strength
• Tough and resilient
• Good resistance to dynamic loading
• Bonds a wide variety of materials

• It is suitable for bonding a wide variety of metals, ceramics, glass, rubbers, rigid plastics and most other materials in common use.
• 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.

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 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 (“pick-ling”) the degreased surfaces.
• Abrading should be followed by a second degreasing treatment.

• Resin and hardener should be blended until they form a homogeneous mix.

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.

Times to minimum shear strength

LSS = Lap shear strength.

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

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

• Cure: (a) = 7 days /23°C
• Cure : (b) = 24 hours/23°C + 30 minutes/80°C

Lap shear strength versus immersion in various media at 23°C (typical average values)

Lap shear strength versus tropical weathering

• 40/92, DIN 50015; typical average values

Lap shear strength versus heat ageing

• Cure: 16 hours at 40°C, test at 23°C, 50% rh

Storage

• Araldite® AW 146 may be stored for up to 3 years at room temperature and Hardener HV 957 may be stored for up to 2 years provided the components are 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 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. Disposable paper - not cloth towels - should be used to dry the skin.
• Adequate ventilation of the working area is recommended.