Enhanced TDS
Identification & Functionality
- Chemical Family
- Fillers Included
- RTU Product Type
- Technologies
- Product Families
Features & Benefits
- Ready-to-Use Product Features
- Features and Benefits
- High mechanical and electrical properties
- Good thermal shock resistance
- Possibility of high filler content
Applications & Uses
- Composites Processing Methods
- Cure Method
- Product End Uses
- Markets
- Applications
- System Preparation
Long pot life is desirable in the processing of any ARALDITE® 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 behavior in high voltage applications.
For the mixing of medium to high viscous ARALDITE® 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 K as a result of friction. For low viscous ARALDITE® casting resin systems, conventional anchor mixers are usually sufficient. In larger plants, two premiers are used to mix the individual components (ARALDITE® and ARADUR®) 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%.
- Application Information
Indoor electrical insulators for medium and high voltage, such as switch and apparatus components, pin insulators, bushings, current and voltage transformers
- Processing Information
The effective pot-life is about 1-2 days at temperature 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 to prevent sedimentation and/or undesired viscosity increase. Interruptions over a weekend (approx. 48h) without cleaning are possible if the pipes are cooled at temperature below 18°C.
Viscosity increase and gel time at various temperatures, refer to Figs: 4.1 to 4.4.
Mold Temperature:
APG process 120 - 150°C
Conventional vacuum casting 80 - 100°CDemolding Times (depending on mould temperature and casting volume)
APG process 10 - 45 min
Conventional vacuum casting 1 - 6h
Cure Conditions
APG process (minimal postcure) 10h 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 gel and postcuring cycles in the manufacturing process could influence the crosslinking and the glass transition temperature respectively.
Fig 4.1: Viscosity increase at 25, 40 and 60°C (measurements with Rheomat 115)
Fig.4.2: Initial viscosity in function of temperature (measurements with Rheomat 115, D =10 s*1)
Fig.4.4: Geltime measured with Gelnorm Instrument in function of temperature (DIN 16945/8.3.1)
Mechanical Properties
Property Test Method Condition Test Value Tensile strength ISO R 527 Determined on standard test specimen at 23°C cured for 10h at 140°C 70 – 90 N/mm² Elongation at break ISO R 527 Determined on standard test specimen at 23°C cured for 10h at 140°C 1.0 - 2.0 % E modulus from tensile test ISO R 527 Determined on standard test specimen at 23°C cured for 10h at 140°C 10000 – 12000 N/mm²
Flexural strength at 23°C ISO 178 Determined on standard test specimen at 23°C cured for 10h at 140°C 110 – 130 N/mm²
Critical stress intensity factor (K1C)
Determined on standard test specimen at 23°C cured for 10h at 140°C 2.0 - 2.5 MPa·m¹/₂
Specific energy at break (G1C)
Determined on standard test specimen at 23°C cured for 10h at 140°C 400 – 500 J/m² Glass transition temperature (DSC) IEC 1006 Determined on standard test specimen at 23°C cured for 10h at 140°C 100 – 110 °C Filler load, by wt.
Determined on standard test specimen at 23°C cured for 10h at 140°C 65 % Electrical Properties
Breakdown strength IEC 243-1 Determined on standard test specimen at 23°C cured for 10h at 140°C 18 – 20 kV/mm HV arc resistance ASTM D 495 Determined on standard test specimen at 23°C cured for 10h at 140°C 185 – 190 s Tracking resistance IEC 112 Determined on standard test specimen at 23°C cured for 10h at 140°C, With test solution A: CTI min. 600-0.0 Tracking resistance IEC 112 Determined on standard test specimen at 23°C cured for 10h at 140°C, With test solution B: CTI min. 600M-0.0 Electrolytic corrosion effect DIN 53489 Determined on standard test specimen at 23°C cured for 10h at 140°C Grade A-1 Loss Factor (tan δ) at 50Hz at 23°C IEC 250 Determined on standard test specimen at 23°C cured for 10h at 140°C 3.2 - 3.5 % Dielectric constant (εγ) IEC 250 Determined on standard test specimen at 23°C cured for 10h at 140°C 4 - 5
Properties
- Physical Form
- Notes
Because the ARADUR hardener is sensitive to moisture, partly emptied containers must be resealed immediately
Regulatory & Compliance
- Certifications & Compliance
Safety & Health
- Handling Precautions
Protective clothing Yes Gloves Essential Arm protector Recommended when skin contact likely
Goggestery diasses Yes Respirator/dust mask Recommended Skin protection before starting work Apply barrier cream to exposed skin
Skin protection after washing Apply barrier or nourishing cream
Skin protection 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
Ventilation: of workplace Exhaust fans. Operatives should avoid inhaling vapours.
- First Aid Information
- 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.
Storage & Handling
- Storage Conditions
The components have to be stored under dry conditions at 18 - 40°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.