ARALDITE® CY 5995 / ARADUR® HY 225

• Very high mechanical and electrical properties
• Very high thermal shock resistance
• Very high toughness

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 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 <0.2%.

• Indoor electrical insulators for medium and high voltage, such as switch and apparatus components.
• Encapsulation of large metal parts.

The effective pot-life of the mix is about 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 week-end (approx. 48h) without cleaning are possible if the pipes are cooled at temperatures below 18°C. For the APG process, an increasement of the filler content, e.g. 300 pbw. is recom- mended. Exothermic temperature, shrinkage and other properties could be positively influenced. Viscosity increase and gel time at various temperatures, refer to Figs: 4.1 and 4.4.

Mold temperature
APG process 130 - 160°C
Conventional vacuum casting 70 - 100°C

Demolding times (depending on mold temperature and casting volume)
APG process 12 - 40 min
Conventional vacuum casting 5 - 8h

Cure conditions
APG process (minimal postcure) 4h at 130°C or 3h at 140°C
Conventional vacuum casting 12h at 130°C or 8h at 140°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 geling and cure cycles in the manu-facturing process could lead to a different crosslinking and glass transition temperature respectively.

 

Process Viscosities

Fig.4.1: Viscosity increase at 40, 60 and 80°C (measurements with Rheomat 115) (Shear rate D = 10 s⁻¹)

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

Fig.4.4: Geltime as a function of temperature (measured with Gelnorm instrument, DIN 16945/6.3.1)

 

Mechanical and Physical Properties

 

Key	Value	Unit	Test Method	Condition
Tensile strength	80 - 90	MPa	ISO 527	Cured for 2h at 100°C + 10h at 140°C
Elongation at break	1.6 - 2.0	%	ISO 527	Cured for 2h at 100°C + 10h at 140°C
E modulus from tensile test	8,800 - 9,800	MPa	ISO 527	Cured for 2h at 100°C + 10h at 140°C
Flexural strength	135 - 145	MPa	ISO 178	Cured for 2h at 100°C + 10h at 140°C
Surface strain	1.9 - 2.1	%	ISO 178	Cured for 2h at 100°C + 10h at 140°C
E modulus from flexural test	9,400 - 9,800	MPa	ISO 178	Cured for 2h at 100°C + 10h at 140°C
Impact strength	13 - 15	kJ/m²	ISO 179	Cured for 2h at 100°C + 10h at 140°C
Critical stress intensity factor (KIC)	3.2 - 3.4	MPa·m¹/²	CG 216-0/89	Cured for 2h at 100°C + 10h at 140°C
Specific energy at break (GIC)	1,000 - 1,100	J/m²	CG 216-0/89	Cured for 2h at 100°C + 10h at 140°C
Glass transition temperature (DSC)	95 - 105	°C	IEC 61006	Cured for 2h at 100°C + 10h at 140°C
Coefficient of linear thermal expansion (20-105°C)	38 - 40 x10⁻⁶	K⁻¹	DIN 53752	Cured for 2h at 100°C + 10h at 140°C
Thermal conductivity	0.75 - 0.8	W/m·K	Similar to ISO 8894-1	Cured for 2h at 100°C + 10h at 140°C
Flammability (Thickness of specimen: 4 mm)	HB		UL 94	Cured for 2h at 100°C + 10h at 140°C
Flammability (Thickness of specimen: 12 mm)	HB		UL 94	Cured for 2h at 100°C + 10h at 140°C
Thermal endurance profile (TEP)	Fig. 7		DIN/IEC 60216	Cured for 2h at 100°C + 10h at 140°C
Temperature index (TI): flexural strength (20,000h/10,000h)	180 / 197	°C	IEC 60085	Cured for 2h at 100°C + 10h at 140°C
Thermal ageing class (20,000h)	H	N/A	IEC 60085	Cured for 2h at 100°C + 10h at 140°C
Water absorption (10 days at 23°C)	0.05 - 0.10	% by wt	ISO 62	Cured for 2h at 100°C + 10h at 140°C
Water absorption (60 minutes at 100°C)	0.10 - 0.20	% by wt	ISO 62	Cured for 2h at 100°C + 10h at 140°C
Density (Filler load: 60% by weight)	1.80 - 1.90	g/cm³	DIN 55990	Cured for 2h at 100°C + 10h at 140°C

 

Electrical Properties

 

Key	Value	Unit	Test Method	Condition
Breakdown strength (IEC 60243-1)	20 - 24	kV/mm	IEC 60243-1	Cured for 2h at 100°C + 10h at 140°C
Diffusion breakdown strength (DIN/VDE 0441/1)	HD 2	Class	DIN/VDE 0441/1	Cured for 2h at 100°C + 10h at 140°C
Temperature of specimen after test	< 23	°C	N/A	Cured for 2h at 100°C + 10h at 140°C
HV arc resistance (ASTM D 495)	184 - 186	sec	ASTM D 495	Cured for 2h at 100°C + 10h at 140°C
Tracking resistance (IEC 60112)	CTI > 600 - 0.0		IEC 60112	Cured for 2h at 100°C + 10h at 140°C
Tracking resistance (with test solution B)	CTI > 600M - 0.1		IEC 60112	Cured for 2h at 100°C + 10h at 140°C
Electrolytic corrosion (DIN 53489)	A-1	Grade	DIN 53489	Cured for 2h at 100°C + 10h at 140°C

 

 

Fig.6.1: Loss factor (tan δ) and dielectric constant (εr) as a function of temperature (measurement frequency: 50 Hz, IEC 60250/ DIN 53483)

 

Fig.6.2: Volume resistivity (ρ) as a function of temperature (measurement voltage: 1000 V, IEC 60093/ DIN 53482)

 

Mechanical Values

Fig.7.1: Crack resistance / Temperature shock test Passed specimen (%) in function of the temperature steps Mean failure temperature: -88°C Embedded metal parts with 2 mm radius

• 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.

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.

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

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. For information on waste disposal and hazardous products of decomposition in the event of fire.