ARALDITE® CY 5622 / ARADUR® HY 1235-1 HARDENER / ACCELERATOR DY 062 / Filler Silica Flour (Silanized)

• Hydrophobicity transfer and recovery
• Good mechanical properties
• Good dielectric properties
• Very good thermal shock resistance
• High erosion resistance under UV radiation
• High tracking and arc resistance
• Extended insulation life-time

Note : The use of silanized silica flour produces stable dielectric properties under humid, outdoor conditions.

• Automatic pressure gelation process (APG)
• Conventional gravity casting process under vacuum

This product data was based on two system formulations:

The following color pastes may be used :
Araldite® DW 9134 BD (gray)
Araldite® DW 0126 (brown)

Araldite® CY 5622 epoxy resin is supplied with a gel-like consistency. It is liquefied by stirring. To adjust a suited viscosity range of the resin, the temperature of the resin at the beginning of the stirring process should be above 6 °C, and below 30°C. In case of longer exposure to temperatures below 6 °C the temperature should be controlled inside in the middle of the packaging before stirring. If the temperature inside the bulk of the product is measured to be below 6 °C the packaging should be heated smoothly from out side (best from below) with max. 30 °C. As this warming process may take up to several weeks depending on size of packaging and temperature conditions, the lead times and storage space should be adjusted in winter accordingly. The resin heats up due to the stirring, the maximum temperature should be 40 °C. Special mixing equipment is needed, as it has to be introduced via the hole of the container. To achieve sufficient and homogenous stirring effect, the stirrer should extend inside the container and a special design is needed for rectangular containers such as a tote. Such design has to ensure that all liquid in edges is sufficiently homogenized. A dynamic torque controlled motor will be needed as the stirring has to start smoothly. Recommendations for suited stirrer equipment are available on request. Transferring the gel-like structure into a normal, low viscous liquid might take several hours. During consumption of the resin, it should be stirred 5 – 15 minutes / hour.

Fig. 7.1 Loss factor (tan 8) and dielectric constant (er) as a function of a function of temperature System A: 64% filler content

Fig. 7.2 Loss factor (tan 8) and dielectric constant (er) as a function of a function of temperature System B: 66% filler content

Fig. 7.3 Volume resistivity (p) as a function of temperature System A: 64% filler content

Fig. 7.4 Volume resistivity (p) as a function of temperature System B: 66% filler content

System A : 100 parts Araldite® CY 5622 + 82 parts Aradur® HY 1235-1 + 0.45 part Accelerator DY 062 + 325 parts Silica flour silanized (System A) OR 355 parts (System B).

Fig. 5.1 Viscosity increase at 40°C, 60°C and 80°C*: System A: 64% filler content
*40°C = 104°F; 60°C = 140°F; 80°C = 176°F

Fig. 5.2 Viscosity increase at 40°C, 60°C and 80°C*: System B: 66% filler content
*40°C = 104°F; 60°C = 140°F; 80°C = 176°F

Fig. 5.3 Initial viscosity as a function of temperature System A: 64% filler content

Fig. 5.4 Initial viscosity as a function of temperature System B: 66% filler content

Gelation and Cure Times
System A : 100 parts Araldite® CY 5622 + 82 parts Aradur® HY 1235-1 + 0.45 part Accelerator DY 02 + 325 parts Silica flour silanized (System A) OR 355 parts (System B).(Measurements with Gelnorm Instrument / DIN 61945)

Fig. 5.5 Gel time measured as a function of temperature System A: 64% filler content

Fig. 5.6 Gel time measured as a function of temperature System B: 66% filler content

Determined on standard specimen at 23 °C (73 °F)
Cured for 6 hours at 80 °C (176 °F) + 10 hours at 140 °C (284 °F) 

For optimized processing, Huntsman recommends that users first prepare separate pre-mixtures of both a resin component containing the inorganic filler and a hardener component also containing inorganic filler. These two prepared components can be stored in separate, heated and agitated vessels under constant vacuum prior to use. In this case, the vessel temperatures should be kept between 50°C and 60°C (122°F and 140°F) at a vacuum range of between 1 and 8 mbar.

Preparation of pre-filled resin component

• Stir Araldite® CY 5622 epoxy resin at low shear to liquefy
• Charge liquefied Araldite® CY 5622 epoxy resin to a mixer
  NOTE : Special thin-film mixers are available that facilitate de-airing
• Bring material to an elevated temperature with agitation (typically 50 – 60 °C / 122 – 140 °F)
• Charge selected inorganic filler(s)
  NOTE : the moisture content of the filler should be less than 0.2 % for casting electrical components
• Mix at elevated temperature under vacuum (1 to 8 mbar). Mixing times vary batch size in the range of 0.5 to 3 hours.

Preparation of pre-filled hardener component

• Charge Aradur® HY 1235-1 hardener to a mixer
  NOTE 1 : Special thin-film mixers are available that facilitate de-airing
  NOTE 2 : Aradur® HY 1235-1 hardener is a liquid anhydride and will react with moisture. Any prolonged contact of this material with ambient air should be avoided. Once opened, any unused portion in the container should be blanketed with dry nitrogen
• Charge Accelerator DY 062
• Bring to an elevated temperature with agitation (typically 50 – 60 °C / 122 – 140 °F)
• Charge selected inorganic filler(s)
  NOTE : the moisture content of the filler should be less than 0.2 % for casting electrical components
• Mix at elevated temperature under vacuum (1 to 8 mbar). Mixing times vary with batch size in the range of 0.5 to 3 hours

Final Mixing of Prepared Pre-filled Components
In larger plants, particularly those employing the Automatic Pressure Gelation casting process, metering pumps are typically used to feed premixed resin and hardener components to a final continuous static or dynamic mixer. The mixed material is then delivered directly into the casting mold.
In smaller batch operations, the prepared components are typically weighed into a final batch mixing vessel. They are then mixed at temperatures typically of 50 °C to 80 °C (122 °F to 176 °F) with a vacuum of 1 to 8 mbar for a period of 0.5 to 3 hours depending on mix temperature, quantity and particular application.
Typical mold temperatures
APG process: 130 – 150 °C (266 – 302 °F)
Conventional vacuum casting: 80 – 100 °C (176 – 212 °F)
Typical de-molding times
APG process: 10 – 30 minutes
Conventional vacuum casting: 2 – 6 hours
Typical cure cycles
APG process: After de-molding, immediately post-cure either: 2 – 3 hours at 150 °C (302 °F) or 4 – 6 hours at 140 °C (284 °F)
Conventional vacuum casting: Gel at 80 – 100 °C (176 – 212 °F) for 2 – 6 hours (depending on part size and application) Parts may be de-molded after gelation then immediately post-cured. Post-curing varies with part size and application. For small parts post-cure can be 2 hours at 150 °C (302 °F)
For large parts, typical post-cures are at lower temperatures for longer times or may be ramped or done stepwise at increasing temperature increments

Determined on standard specimen at 23 °C (73 °F)
Cured for 6 hours at 80 °C (176 °F) + 10 hours at 140 °C (284 °F) 

Fig. 7.1 Loss factor (tan 8) and dielectric constant (er) as a function of a function of temperature System A: 64% filler content

Fig. 7.2 Loss factor (tan 8) and dielectric constant (er) as a function of a function of temperature System B: 66% filler content

Fig. 7.3 Volume resistivity (p) as a function of temperature System A: 64% filler content

Fig. 7.4 Volume resistivity (p) as a function of temperature System B: 66% filler content

System A : 100 parts Araldite® CY 5622 + 82 parts Aradur® HY 1235-1 + 0.45 part Accelerator DY 062 + 325 parts Silica flour silanized (System A) OR 355 parts (System B).

Fig. 5.1 Viscosity increase at 40°C, 60°C and 80°C*: System A: 64% filler content
*40°C = 104°F; 60°C = 140°F; 80°C = 176°F

Fig. 5.2 Viscosity increase at 40°C, 60°C and 80°C*: System B: 66% filler content
*40°C = 104°F; 60°C = 140°F; 80°C = 176°F

Fig. 5.3 Initial viscosity as a function of temperature System A: 64% filler content

Fig. 5.4 Initial viscosity as a function of temperature System B: 66% filler content

Gelation and Cure Times
System A : 100 parts Araldite® CY 5622 + 82 parts Aradur® HY 1235-1 + 0.45 part Accelerator DY 02 + 325 parts Silica flour silanized (System A) OR 355 parts (System B).(Measurements with Gelnorm Instrument / DIN 61945)

Fig. 5.5 Gel time measured as a function of temperature System A: 64% filler content

Fig. 5.6 Gel time measured as a function of temperature System B: 66% filler content