ARALDITE® AW 136H / HARDENER HY 991

• 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 property 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 treatmentThe 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 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

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.

Typical 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 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 , tested at 23°C, pretreatment - Sand blasting

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

• Cure: 16 hours at 40°C

Roller peel test (ISO 4578) (typical average values)

• On aluminium sandblasted, cured: 16 hours at 40°C : 3-5 N/mm

Mechanical properties (ISO 527) (typical values)

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

Lap shear strength versus tropical weathering (ISO 4587) (typical average values)

• (40°C/ 92% RH), on aluminium, cured for 16 hours at 40°C and tested at 23°C. Pretreatment - Sand blasting

Shear modulus (DIN 53445) (typical average values)

Cure: 16 hours/40°C

• Good performance up to 90°C
• Suitable for bonding metals and some plastics
• Viscous liquid adhesive

      Storage 

• Araldite® AW 136 H and Hardener HY 991 must be stored at room temperature 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 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.