ARALDITE® AY 105 / HARDENER HY 951

• Spread a thin layer of mixed resin by spatula, brush or roller on both surfaces to be bonded and assemble substrates as soon as possible.
• Maximum joint assembly time is one hour. Keep the joint lightly clamped or otherwise supported while the adhesive cures.

Recommended Cure Schedule

Typical Properties

* Average shear strength of a 0.04 in (0.91 mm) BS L152 aluminum alloy lap joint (joint area was 0.5 x 1 inch (12.5 mm x 2.5 cm in each case.)

+ Average deflection temperature after curing for 3 hrs. at 140°F (60C). Prolonged curing at temperatures above 140°F (60°C) will give a deflection temperature above 212°F (100°C) with HY 951 or approaching 212°F (100°C) with HY 956:

Processing

• Because of heat generated by the exothermic reaction between resin and hardener, the usable life of the mixed epoxy adhesive will be noticeably shortened if more than 250 gram of mixture is allowed to stand in a compact mass, as in a mixing beaker or similar “bulk” container.
• To minimize exothermic temperature rise, dissipate heat by dividing the mixture into several small containers or by pouring the material into a shallow container to increase the surface to volume ratio.
• The mixed resin system should be spread to a thin layer of more than 0.2 in – 0.4 in (5 mm – 10 mm).
• A shallow polyethylene basin is recommended because this will allow hardened resin residues to be removed by simply flexing the container.
• If there is a risk that the mixed material may be exposed to moist air, containers must be covered.
• Since the resin system has a limited usable life, it is good practice to prepare only the quantity of adhesive needed for immediate use or to use automatic mixing/dispensing equipment.

Moisture Pick-up

• Hardener HY 951 are hygroscopic ; they absorb moisture when exposed to damp/humid air.
• The hardeners and uncured resin-hardener mixtures can be adversely affected by high atmospheric humidity which, when the mixture is applied as a thin layer, may even prevent curing.
• Low ambient temperatures, which prolong curing, aggravate this effect.
• The epoxy resins and hardeners should not be prepared or applied in work areas exposed to high atmospheric humidity combined with low ambient temperature.
• To reduce the effect of moist air, the mixed resin and hardener should be allowed to stand in a covered mixing container so that the curing reaction is well under way when the material is used.

• Eyes and skin : Flush eyes with water for 15 minutes. Contact a physician if irritation persists. Wash skin thoroughly with soap and water. Remove and wash contaminated clothing before reuse.
• Inhalation : Remove subject to fresh air.
• Swallowing : Dilute by giving water to drink and contact a physician promptly. Never give anything to drink to an unconscious person.

• Araldite®epoxy resins and hardeners should be stored in a dry place at temperatures between 41 °F – 77°F (5 °C – 25 °C).
• Under these conditions, Araldite® AY 103 epoxy and Araldite®AY 105 have an assigned shelf life of five years.
• Hardener HY 951 and HY 956 have an assigned shelf life of three years.