ARALDITE® CW 31000 / ARADUR® 3489

• Medium - long pot-life up to 40°C
• Good mechanical and electrical properties
• Very good crack resistance

Coils, Inductivities, e.g. MRI gradient coils, Instrument Transformers

General instructions for preparing liquid resin systems
The filled resin component should be stirred and homogenized in the original container before use.
In the storage vessels of the production equipment, the pre-filled products should be stirred up from time to time to avoid sedimentation and irregular metering.
Brief degassing of the components under 5-10 mbar vacuum improves the mixture
homogeneity and enhances impregnation capability and the electrical end mechanical properties of the cured resin.
The casting mix is best prepared by heating the resin up to 30-40°C before stirring in the hardener.
Due to the relative short pot life, batch mixer is not recommended, a static or dynamic mixing and dosing equipment should be used.

Viscosity vs. Time at 30°C, 40°C and 70 °C

Fig.4.1: Viscosity increase at 30, 40 and 70 °C
measurements with Rheostress 6000, PP20, 1 mm gap,10/sec

Fig.4.2: Initial viscosity in function of temperature
(measurements with Rheostress6000, D=10S^-1)

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)

The effective pot-life of the mix is about 4- 6 hours at temperatures at 25°C or below and 2 hours at 30 °C.
Viscosity increase and gel time at various temperatures,
Mould temperature
Conventional vacuum casting 30 - 50°C
Demoulding times (depending on mould temperature and casting volume)
Conventional vacuum casting 4 - 8 h
Cure conditions (minimal postcure)
Conventional Vacuum Casting 6 h at 50°C + 6h at 70°C

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.

Linear shrinkage after cure
12 h 30°C + 6 h 70°C: 0.15 %

Fig.4.4: Geltime and potlife measured in function of temperature
(Geltime measurement with Gelnorm Instrument)

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. ARALDITE® 3489 is sensitive to humidity, partly emptied containers should be closed tightly immediately after use.