ARALDITE® CY 9729 / ARADUR® HT 907 / ACCELERATOR DY 9741

• Greater toughness than porcelain and equal, or superior, to competitive epoxies.
• Better thermal shock resistance.
• Improved weatherability compared to aromatic bisphenol-A epoxies.
• Low dielectric loss and excellent tracking resistance for applications > 105 °C
• Greater toughness and far closer dimensional tolerances result in greater reliability

• High voltage circuit breaker bushings
• SF6 inner frusta
• Air transformer bushings
• Oil transformer bushings
• Stand-off insulators
• Weather sheds on suspension and dead end insulators
• Arc shields
• Station and line post insulators
• Surge arrestor castings
• Phase separators
• Structural switchgear parts

• Processing is best accomplished using Automatic Pressure Gelation (APG) Process. Moldings can be produces using Araldite® products with either a one-component or a two-component system. In the oncomponent process the resin and hardener with accelerator are each separately heated to 50 – 70 °C and blended with filler. The mixer resin and hardener have a pot life of 90 – 120 minutes at 70 °C, as determined by a maximum viscosity of 20,000 cPs. At lower pot temperatures, longer pot lives are obtained.
• In the two-component Araldite® system, the resin and hardener components are handled in the same manner as in the one-component system, except that they are mixed in an in-line static mixer immediately prior into the mold. Thus, the resin and hardener are separately heated, mixed with filler and degassed. At this stage, the two components are stable indefinitely (one month or more) with two exceptions : 1) agitation should continue to keep the filler from setting, and 2) water should not be allowed to contaminate either side. If agitation is stopped for more than one day, the filler may sellte out and be difficult to redisperse. Tests have shown that addition of 1% water to a mixture of Araldite® products will substantially reduce the heat distortion temperature of a molded part and degrade its dielectric loss properties. Significant advantages of a two-component system include 1) ease of clean up and 2) the ability to stop molding and resume later, even after an overnight break.
• The cure cycle for parts depends on the size of the part, the mold temperature and the molding equipment’s ability to supply heat to the resin. With the recommended 150 °C mold temperature, for a two-inch diameter part in a steel mold, in-mold time will be about 9 minutes. Smaller parts or high mold temperature will result in shorter cycles. Larger parts or lower mold temperatures will increase cycle times. An in-mold time of 13 minutes is expected for parts with a 4-inch diameter and 17 minutes is expected for parts with a 7-inch diameter at a mold temperature of 150 °C.
• All parts should be posted-cured soon after removal from the mold. A post cure cycle of 4 hours at 160 °C is recommended, although shorter periods may be satisfactory for smaller parts.

Huntsman Advanced Materials Americas LLC maintains up–to-date Material Safety Data Sheets (MSDS) on all of its products. These sheets contain pertinent information that you may need to protect your employees and customers against any known health or safety hazards associated with our products. Users should review the latest MSDS to determine possible health hazards and appropriate precautions to implement prior to using this material.

Araldite® CY 9729, Aradur® HT 907, and Accelerator DY 9741 should be stored in a dry place, in the sealed original container, at temperatures between +2°C and +40°C (+35.6°F and 104°F). Under these storage conditions, the shelf life is 1.5 years. The product should not be exposed to direct sunlight.

Araldite® CY 9729 If only partly used, be sure to re-close container properly.

Aradur® HT 907 This product is moisture sensitive and packaged under a blanket of dry nitrogen. Maintain seal, after use re-blanket with dry nitrogen and tightly seal.

Accelerator DY 9741 : Combustible liquid. Do not cure or weld container. Keep away fro heat, sparks, and open flame. Use with adequate ventilation. In case of fire, use CO2, dry chemical or foam. Keep containers closed to prevent moisture absorption and contamination.