ARALDITE® CW 5859 / ARADUR® HW 5859

• Long pot life, short gel time at higher temperatures
• Excellent electromechanical performance
• Excellent crack resistance

Instrument transformers and dry-type transformers

General instructions for preparing liquid resin systems
The following is the suggested preheat temperature of ARALDITE Resin and ARADUR Hardener:
ARALDITE resin: 50°C for 6 to 12 hrs
ARADUR hardener: room temperature
Filler: 80 °C - 110 °C for 6 to 12 hrs depends on process condition

Mix all of the components together very thoroughly, (the mixture temperature will be reached at or about 60°C. If lower mix viscosity is expected, preheat resin at higher temperature but not exceed 80°C) and under vacuum.

Proper mixing will result in:

• Better flow properties and reduced tendency to shrinkage
• Lower internal stresses and therefore improved mechanical properties on object
• Improved partial discharge behaviour in high voltage applications.

For the mixing of medium to high viscous ARALDITE casting resin systems and for mixing at lower temperatures, it is recommended special thin film degassing mixers that may produce additional self-heating of 10-15°C as a result of friction. For low viscous ARALDITE casting resin systems, conventional anchor mixers are usually sufficient.

In larger plants, two pre-mixers are used to mix the individual components (resin, hardener) under vacuum. Metering pumps then feed these premixes to the final mixer or a continuous mixer. The individual premix can be stored at elevated temperature (about 60°C) for up to about 1 week, depending on formulation. Intermittent agitation during storage is advisable to prevent filler sedimentation.

Mixing time can vary from 0.5 to 3 hours, depending on mixing temperature, quantity, mixing equipment and the particular application. The required vacuum is 0.5 to 8 mbar. The vapour pressure of the individual components should be taken into account.

The filler in the liquid premix will settle over time. It is recommended to stir it evenly in the packaging bucket before use. The storage tank of the production equipment also needs to be stirred to avoid sedimentation and affect the metering.

The product should be stored in a dry environment at 5-25°C in the original tightly sealed container. Under these conditions, the storage period corresponds to the expiration date indicated on the packaging label. After this date, the product must be tested to determine whether it is still effective. If only a portion of the material in the container is used, it should be sealed immediately.