ARALDITE® CY 5997 / ARADUR® HY 5961 / ACCELERATOR DY 062

• Excellent mechanical and electrical properties.
• Good thermal shock resistance
• Possibility of high filler content

General instructions for preparing liquid resin systems.

Long pot life is desirable in the processing of any casting resin system. Mix all of the components together very thoroughly at room temperature or slightly above and under vacuum. Intensive wetting of the filler is extremely important. 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 casting resin systems and for mixing at lower temperatures, we recommend special thin film degassing mixers that may produce additional self-heating of 10-15°C as a result of friction. For low viscous casting resin systems, conventional anchor mixers are usually sufficient.

In larger plants, two pre-mixers are used to mix the individual components with the respective quantities of fillers and additives under vacuum. Metering pumps then feed these premixes to the final mixer or a continuous mixer. The individual premixes can be stored at elevated temperature (about 60°C) for up to about 1 week, de-pending 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. Degassing time is recommended at least 1 hour. The vapour pressure of the individual components should be taken into account.

In the case of dielectrically highly stressed parts, we recommend checking the quality consistency and pre-drying of the filler. Their moisture content should be max. 0.2%.

Instrument transformers, dry type distribution transformer. Insulating parts medium and high voltage application.

End properties of this system have been tested with silica filler.

The effective pot-life of the mix is about 1 to 2 days at temperatures below 25°C. Conventional batch mixers should be cleaned once a week or at the end of work. For longer interruptions of work, the pipes of the mixing and metering installations have to be cooled and cleaned with the resin component to prevent sedimentation and/or undesired viscosity increase. Interruptions over a weekend (approx. 48h) without cleaning are possible if the pipes are cooled at temperatures below 18°C. For data on viscosity increase and gel time at various temperatures, refer to Figs: 4.1 and 4.4.

Mold temperature
APG process 120 - 160°C
Conventional vacuum casting 80 - 100°C

Demolding times (depending on reactivity, mold temperature and casting volume)

APG process 10 - 45 min
Conventional vacuum casting 1 - 6 h

Cure conditions
APG process (minimal postcure) 5h at 140°C
Conventional vacuum casting 4h at 80°C + 8h at 140°C
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 gelling and cure cycles in the manufacturing process could lead to a different crosslinking and glass transition temperature respectively.

Processing Viscosities

Fig.4.1: Viscosity increase at 60, 70 and 80°C (measurements with Rheomat 115) (measurements with Rheomat 115, D =10 s⁻¹)

Fig.4.2: Initial viscosity as a function of temperature (measurements with Rheomat 115, D =10 s⁻¹)

Gelation and Cure Time

Fig.4.4: Geltime measured with Gelnorm Instrument as a function of temperature (ISO 9396)

Mechanical and Physical Properties

Electrical Properties

Fig.6.1: Loss factor (tan ) and dielectric constant ( r) as a function of temperature (measurement frequency: 50 Hz, IEC 60250)

Fig.6.2: Volume resistivity ( ) as a function of temperature (measurement voltage: 1000 V, IEC 60093)

• Contamination of the eyes by resin, hardener or casting mix should be treated immediately by flushing with clean, running water for 10 to 15 minutes. A doctor should then be consulted.
• Material smeared or splashed on the skin should be dabbed off, and the contaminated area then washed and treated with a cleansing cream (see above). A doctor should be consulted in the event of severe irritation or burns. Contaminated clothing should be changed immediately.
• Anyone taken ill after inhaling vapours should be moved out of doors immediately.

The components have to be stored in tightly sealed and dry original containers according to the storage conditions on the product label Under these conditions, the shelf life will correspond to the expiry date stated on the label. Product specific advise regarding storage can be found on product label. After this date, the product may be processed only following reanalysis. Partly emptied containers should be closed tightly immediately after use.