ARALDITE® CY 184 / HARDENER HT 907 / ACCELERATOR DY 071 / Silica Flour

• Very good mechanival and electrical properties
• Good thermal shock and crack resistance
• Good toughness combined with dimensional stability
• Very good resistance to erosion by UV radiation
• High tracking and arc resistance

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

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:

1. Better flow properties and reduced tendency to shrinkage
2. Lower internal stresses and therefore improved mechanical properties on object
3. 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 premixers are used to mix the individual components (resin and hardener) 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. 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 predrying of the filler. Their moisture content should be < 0.2%.

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Outdoor electrical insulators for applications in medium and high voltage: apparatus and switchgear parts, insulators and bushings, instrument transformers.

The effective pot-life of the mix is about 2 days at temperatures below 40°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 week-end (approx. 48h) without cleaning are possible if the pipes are cooled at temperatures below 18°C.

Viscosity increase and gel time at various temperatures, refer to Figs: 4.1 and 4.4.

Mould temperature
APG process : 130 - 150°C
Conventional vacuum casting : 80 - 100°C
Demoulding times (depending on mould temperature and casting volume)
APG process : 10 - 40 min
Conventional vacuum casting : 3 - 8 h
Cure conditions (minimum post curing)
APG process : 6-12h at 130°C or 140°C
Conventional vacuum casting : 10h-20h at 130°C or 140°C

For any outdoor application, we recommend the use of silanised silica flour; for example Silbond W12-EST (Quarzwerke GmbH, Frechen, D). Again it is essential to achieve a thorough crosslinking.To determine whether crosslinking has been carried to completion and the final properties 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.

Mandatory and recommended industrial hygiene procedures should be followed whenever our products are being handled and processed.

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. In all cases of doubt call for medical assistance.

Safety precautions at workplace:
Protective clothing : yes
Gloves : essential
Arm protectors : recommended when skin contact likely
Goggles/safety glasses : yes
Respirator/dust mask : recommended

Skin protection
Before starting work Apply barrier cream to exposed skin after washing Apply barrier or nourishing cream
Cleansing of contaminated skin Dab off with absorbent paper, wash with warm water and alkali-free soap, then dry with disposable towels. Do not use solvents
Clean shop requirements Cover workbenches, etc. with light coloured paper. Use disposable breakers, etc.
Disposal of spillage Soak up with sawdust or cotton waste and deposit in plastic-lined bin

Ventilation:
of workshop Renew air 3 to 5 times an hour
of workplace Exhaust fans. Operatives should avoid inhaling vapours.

Store the components at 18-25°C, in tightly sealed and dry original containers. 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.