ARALDITE® CY 1886 / ARADUR® HY 5836 / Filler Silica Flour

• Very good mechanical and electrical properties.
• Good temperature shock resistance.
• Very good resistance to erosion by UV radiation.
• Suitale for the manufacture of weather-resistant, heavy-duty insulators.

The use of silianized silica flour insures stable dielectrical properties under outdoor humid conditions.

Outdoor electrical insulation material for medium and high voltage application, such as current and potential transformers ... etc.

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.

Dilute leftover mix at the end of a shift with the resin component prior to storage overnight or over the weekend. Piping containing prefilled components or casting mixes should be cooled immediately after work to prevent sedimentation and/or undesired viscosity increases. This helps minimize material losses and cleaning work. Viscosity increase and gel time at various temperatures.

To determine whether crosslinking has been carried to completion and the final proper- ties are optimal, it is necessary to carry out relevant measurements on the actual object or to measure the glass transition temperature. Different gel and postcuring cycles in the manufacturing process could influence the crosslinking and the glass transition temperature respectively.

System tested:
ARALDITE CY 1886 VN / ARADUR HY 5836 VN / Filler
(silanised) Mix ratio: 100 / 80 / 300
Determined on standard test specimen at 23°C
cured for 6h at 80°C + 8h at 130°C

The components have to be stored under dry conditions at 6-35°C, in tightly sealed original containers. Under these conditions, the shelf life will correspond to the expiry date stated on the label. After this date, the product may be processed only following reanalysis. Partly emptied containers should be closed tightly immediately after use.