ARALDITE® AW 136H / HARDENER HV 997

• Weak thixotropy
• Suitable for up to 60°C
• Excellent moisture and humidity resistance
• Suitable for joining metal and plastic materials

• 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 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)

•  Cure: 16 hours at 40°C and 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)

• Cure: 16 hours at 40°C : 4.5 N/mm

Electrolytic corrosion (DIN 53489)

• A-A/B 1,2 (4 days at 40°C/92% RH)

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

• Unless otherwise stated, L.S.S. was determined after immersion for 30 days at 23°C

Lap shear strength versus tropical weathering

• (40/92, DIN 50015; typical average values)
• Cure: 16 hours at 40°C; test at 23°C

Shear modulus (DIN 53445)

Cure: 16 hours at 40°C

• 0°C - 1.1 GPa       
• 25°C - 0.8 GPa
• 50°C - 0.6 GPa
• 75°C - 50 MPa
• 100°C - 8 MPa

Roller Peel Test (ISO 4578) (typical average values)

• Aluminium, sandblasted, hardened: 40°C for 16 hours : 4-6 N/mm

Pretreatment

• The strength and durability of a bonded joint depend on proper treatment of the surfaces to be joined.

• Use a good degreaser such as acetone or isopropanol (for plastics) to remove all residues such as oil, grease and dirt.
• At least the joint surfaces must be cleaned using a specially formulated degreaser. Never use low-grade alcohol, gasoline (petrol) or paint thinner.
• Mechanically sanding or chemically etching("pickling") the degreased surface will produce the strongest and most durable joint.
• After polishing, a second degreasing treatment is required.

The resin and hardener must be mixed well until a homogeneous mixture is formed.

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.

Storage

• Araldite® AW 136H / HV 997  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 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 recom- mended.