Dry-type Distribution Transformers

Araldite® systems have a long, successful track record in the area of dry-type distribution transformers. Our Araldite® product range meets the general requirements for cast resin transformers, providing high crack resistance, a slow curing process to avoid internal stresses, and the high thermal class required for this type of application.


Araldite® Casting Systems for Indoor Applications

Product Designation Filled Unfilled Mix ratio
(pbw)
Tg, °C Viscosity
(40°C), cPs
K1C
Mpa.m0.5
Manufacturing process Main properties
Araldite CW 229 / Aradur HW 229-1 ˆš 100 / 100 110 – 120 35,000 – 65,000 2.8 – 3.0 Automatic pressure gelation, vacuum casting Excellent resistance to thermal cycling and thermal endurance properties. Qualifies for 200°C applications. Supplied in black also. Recognized UL 746 C. Relative thermal index is 200°C.
Araldite CW 9029 / Aradur HW 9029 ˆš 100 / 100 110 – 120 35,000 – 65,000 2.7 – 2.8 Automatic pressure gelation, vacuum casting Suitable for medium to high voltage applications including SF6 types of insulation. Qualifies for 200°C applications. Supplied in blue and black.
Aradlite CW 5942-1 / Aradur HW 5943-1 ˆš 100 / 100 50 – 60 12,000 – 15,000 2.4 – 2.6 Vacuum casting Suitable for applications requiring a flame retardant insulation system. Recognized to UL® 94 V-0 (6.0mm).
Araldite CY 5841 ˆš One component 115 – 120 1,500 – 2,200 N/A Vacuum pressure impregnation One component. Excellent thermal endurance. Suitable for 180°C continuous service
Araldite CY 5948 Brown /
Aradur HY 925-1 / Silica
ˆš 100 / 80 / 350 80 – 90 14,000 (60°C) 3.1 – 3.4 Vacuum casting Long pot life. Excellent mechanical and electrical properties. Excellent crack resistance. Recognized UL 746 B. Relative thermal index is 200°C.
Araldite CY 5825 / Aradur HY 5825 ˆš 100 / 121 230 – 240 30,000 – 40,000 N/A Vacuum casting High Tg, suitable for high-temperature electrical insulation applications. Due to higher functionality, the gamma radiation resistance is superior to that of standard Bisphenol-A based epoxy systems.
Araldite F / Aradur HY 905 / Accelerator DY 062 / Flexibilizer DY 040 / Silica flour ˆš 100 / 100
1.0 / 10 / 410
90 – 100 10,000 (80°C) 2.7 – 2.9 Vacuum casting For indoor electrical insulators for medium and high voltage transformers. Provides good mechanical, electrical and very high thermal endurance properties.
Araldite B41 / Aradur HT903-1 ˆš 100 / 40 105 – 120 ~2,500 (100°C) 2.1 – 2.3 Vacuum casting For indoor electrical insulators for medium and high voltage transformers. Provides good mechanical, electrical and very high thermal endurance properties.

Araldite® HCEP Hydrophobic Systems for Outdoor Applications

Product Designation Unfilled Mix Ratio
(pbw)
Tg, °C Viscosity
(40°C), cPs
K1C
Mpa.m0.5
Manufacturing process Main properties
Araldite 5622 / Aradur HY 1235 / Accelerate DY 062 / Silica flour ˆš 100 / 82
0.45 / 325
100 – 115 10,000 2.3 – 2.5 Automatic pressure gelation, vacuum casting Hydrophobic cycloaliphatic epoxy unfilled system, excellent thermal cycle resistance, hydrophobicity transfer and recovery.

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