Enhanced TDS
Identification & Functionality
- Chemical Family
- RTU Product Type
- Technologies
- Product Families
Features & Benefits
- Product Features
- Features and Benefits
- High filler- or glassfibrecontent possible due to low initial mix viscosity
- Long pot-life up to 80°C
- Good mechanical and electrical properties
- Good crack resistance
- Very good thermal endurance properties
Applications & Uses
- Cure Method
- Product End Uses
- Markets
- Applications
- System Preparation
General instructions for preparing liquid resin systems.
Long pot life is desirable in the processing of any casting and impregnating resin system. Mix all of the components together very thoroughly at room temperature or slightly above and under vacuum. Proper mixing will result in homogenous mixture with uniform reactivity
For the mixing of medium to high viscous casting resin systems and for mixing at lower temperatures, we recommend special thin film degassing mixers. For this low viscous impregnating resin systems, conventional anchor mixers are usually sufficient.
In larger plants, two premixers are used to mix the individual components (resin, hardener) with the respective quantities of additives (if used) 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. 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.
- Processing Information
The effective pot-life of the mix is about 1 day 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 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 Page 4.
Mold temperature
Conventional vacuum casting 80 - 100°C
Demolding times (depending on mold temperature and casting volume)
Conventional vacuum casting 10 - 20 h
Cure conditions (minimal postcure)
Conventional Vacuum Casting 4h at 80°C + 10h at 140°C
Typical curing cycle for DDT 15h 75 °C and 8 h 140°C and 12h 145 °CTo 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 70 and 80°C (measurements with Rheomat 115) (Shear rate D = 10 S⁻¹)
Fig.4.2: Initial viscosity in function of temperature (measurements with Rheomat 115, D=10S⁻¹)
Fig.4.4: Geltime measured in function of temperature (measurement with Gelnorm Instrument)
Mechanical and Physical Properties
Key Value Unit Test Method Condition Tensile strength 70 - 75 N/mm² ISO R 527: 1993 Cured for 4h at 80°C + 10h at 140°C, Determined on unreinforced, cast standard test specimen at 23°C
Elongation at break 4 - 5 % ISO R 527 Cured for 4h at 80°C + 10h at 140°C, Determined on unreinforced, cast standard test specimen at 23°C
E modulus from tensile test 3100 - 3400 N/mm² ISO R 527 Cured for 4h at 80°C + 10h at 140°C, Determined on unreinforced, cast standard test specimen at 23°C
Flexural strength 125 - 135 MPa ISO 178: 2001 Cured for 4h at 80°C + 10h at 140°C, Determined on unreinforced, cast standard test specimen at 23°C
Surface strain 7 - 11 % ISO 178 Cured for 4h at 80°C + 10h at 140°C, Determined on unreinforced, cast standard test specimen at 23°C
E modulus 3100 - 3400 MPa ISO 178 Cured for 4h at 80°C + 10h at 140°C, Determined on unreinforced, cast standard test specimen at 23°C
Critical stress intensity factor (KIC) 1 - 1.1 MPa·m¹/² PM 216-1989 Cured for 4h at 80°C + 10h at 140°C, Determined on unreinforced, cast standard test specimen at 23°C
Specific energy at break (GIC) 320 - 360 J/m² PM 216-1989 Cured for 4h at 80°C + 10h at 140°C, Determined on unreinforced, cast standard test specimen at 23°C
Glass transition temperature (DSC) 82 - 87 °C ISO 11357-2: 1999 Cured for 4h at 80°C + 10h at 140°C, Determined on unreinforced, cast standard test specimen at 23°C
Coefficient of linear thermal expansion (below Tg) 48 ppm/K ISO 11359: 1999 Cured for 4h at 80°C + 10h at 140°C, Determined on unreinforced, cast standard test specimen at 23°C
Thermal conductivity 0.18 - 0.20 W/mK Similar to ISO 8894-1 Cured for 4h at 80°C + 10h at 140°C, Determined on unreinforced, cast standard test specimen at 23°C
Thermal endurance profile (TEP) Fig. 6 N/A DIN/ IEC 60216 Cured for 4h at 80°C + 10h at 140°C, Determined on unreinforced, cast standard test specimen at 23°C
Thermal ageing class (20000h) Class H N/A IEC 60085 Cured for 4h at 80°C + 10h at 140°C, Determined on unreinforced, cast standard test specimen at 23°C
Water absorption (specimen: 50×50×4 mm) (10 days at 23°C) 0.41 % by wt ISO 62 Cured for 4h at 80°C + 10h at 140°C, Determined on unreinforced, cast standard test specimen at 23°C
Water absorption (specimen: 50×50×4 mm) (60 min at 100°C) 0.43 % by wt ISO 62 Cured for 4h at 80°C + 10h at 140°C, Determined on unreinforced, cast standard test specimen at 23°C
Water absorption (specimen: 50×50×4 mm) (10h at 100°C) 1.35 % by wt ISO 62 Cured for 4h at 80°C + 10h at 140°C, Determined on unreinforced, cast standard test specimen at 23°C
Water absorption (specimen: 50×50×4 mm) (100h at 100°C) 2.12 % by wt ISO 62 Cured for 4h at 80°C + 10h at 140°C, Determined on unreinforced, cast standard test specimen at 23°C
Density 1.12 - 1.16 g/cm³ ISO 1183 Cured for 4h at 80°C + 10h at 140°C, Determined on unreinforced, cast standard test specimen at 23°C
Electrical Properties
Key Value Unit Test Method Condition Breakdown strength (IEC 60243-1) 23 - 27 kV/mm IEC 60243-1 Cured for 4h at 80°C + 10h at 140°C, Determined on unreinforced, cast standard test specimen at 23°C
HV arc resistance 85 - 90 sec ASTM D 495 Cured for 4h at 80°C + 10h at 140°C, Determined on unreinforced, cast standard test specimen at 23°C
Tracking resistance (with test solution A) CTI >600 - <1 N/A IEC 60112 Cured for 4h at 80°C + 10h at 140°C, Determined on unreinforced, cast standard test specimen at 23°C
Tracking resistance (CTI >600M - <1) CTI >600M - <1 N/A IEC 60112 Cured for 4h at 80°C + 10h at 140°C, Determined on unreinforced, cast standard test specimen at 23°C
Fig.6.1: Loss factor (tan δ) and dielectric constant (εr) as a function of temperature (measurement frequency: 50 Hz) (IEC 250 / DIN 53483)
Fig.6.2: Volume resistivity (ρ) as a function of temperature (measurement voltage: 1000 V) (IEC 93 / DIN 53482)
- Application Information
Dry-type distribution transformers, glass fiber reinforced
Properties
- Physical Form
- Notes
ARADUR® HY 926 s sensitive to humidity, partly emptied containers should be closed tightly immediately after use.
Packaging & Availability
- Regional Availability
Storage & Handling
- Storage Conditions
Store the components in a dry place in tightly sealed original containers. Under these conditions, the shelf life will correspond to the expiry date stated on the label. Partly emptied containers should be tightly closed immediately after use.
Other
- Processing & Application Methods
- Application Information
Value Units Test Method / Conditions Mix Ratio 0.8 %(W) Hardener : Resin