Araldite CW 1302 Resin with Aradur HY 1300 GB Hardener is a prefilled casting resin system optimized for processing and curing at room temperature or slightly elevated temperature to yield excellent thermal endurance. It is recommended for the manufacture of transformers, filters, capacitors, or electrical devices used in potentially explosive environments. The system can be processed by casting or vacuum casting.
1. Key Benefits
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Good thermal conductivity
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Low water absorption
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Excellent thermal endurance
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Flammability: UL 94 V0 for 3.0 mm thick plaque
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UL 1446 System Temperature Class 180 (H)
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Railway certified: EN 45545-2 R22 HL2 / R23 HL3
2. Typical Properties
2.1 Components and Mixing Ratio
| Property |
Araldite CW 1302 Resin |
Aradur HY 1300 GB Hardener |
Test Method |
| Appearance |
Beige to gray viscous liquid |
Clear yellowish liquid |
Visual |
| Viscosity at 25°C, mPa·s |
20,000–27,000 |
150–190 |
ISO 3219 / ISO 2555 / ISO 12058 |
| Specific gravity, g/cm³ |
1.75–1.77 at 25°C |
0.99–1.01 at 20°C |
ISO 2811 |
| Mixing ratio, parts by weight |
100 |
11 |
— |
| Mixing ratio, parts by volume |
100 |
19 |
— |
TDS notes: Araldite CW 1302 Resin is a modified, solvent-free epoxy resin filled with inorganic filler; viscosity measured based on ISO 3219. Aradur HY 1300 Hardener is a formulated, medium-viscosity polyamine hardener; viscosity measured based on ISO 12058.
2.2 Mixed Properties
| Property |
Value |
Test Method |
| Mixed viscosity at 40°C, mPa·s |
3,450–3,550 |
Rheomat |
| Gel time at 25°C, min |
79–81 |
— |
| Gel time at 40°C, min |
50–75 |
— |
| Gel time at 60°C, min |
25–35 |
— |
| Pot life at 40°C, min (time to reach 15,000 mPa·s) |
36–38 |
— |
2.3 Typical Cured Properties
TDS note: Unless otherwise stated, data were determined with typical production batches using standard test methods. They are typical values only and do not constitute a product specification. Data are collected on cured standard specimens at 23°C. Specimens were cured 24 hours at 25°C plus 6 hours at 60°C.
| Property |
Value |
Test Method |
| Glass transition temperature by DSC, °C |
74–76 |
ISO 6721 |
| Modulus in torsion G' at 25°C, MPa |
3,350–3,400 |
ISO 6721 |
| Temperature index, °C |
181 |
IEC 60216 |
| System Temperature Class |
180 (H) |
UL 1446 |
| Tensile strength, MPa |
34–36 |
ISO 527 |
| Tensile elongation at break, % |
0.7–0.8 |
ISO 527 |
| Tensile modulus, MPa |
7,690–7,710 |
ISO 527 |
| Flexural strength, MPa |
64–66 |
ISO 178 |
| Flexural modulus, MPa |
8,450–8,550 |
ISO 178 |
| Thermal linear coefficient Alpha 1 (before Tg), ppm/K |
41–43 |
ISO 11359-2 |
| Thermal linear coefficient Alpha 2 (after Tg), ppm/K |
104–106 |
ISO 11359-2 |
| Thermal conductivity, W/mK |
0.87–0.89 |
ISO 8894-1 |
| Hardness, Shore D |
88 |
DIN 53505 |
| Flammability at 3.0 mm thickness |
V0 |
UL 94 |
| Flammability at 1.5 mm thickness |
HB |
UL 94 |
| Oxygen Index LOI, % |
36.1 |
ISO 4589-2 |
| Smoke Density Ds(max) |
238 |
ISO 5659-2 |
| Smoke Toxicity CIT |
0.81 |
NF X 70-100 |
| Water absorption, 1 day at 23°C, % by weight |
0.03–0.05 |
ISO 62 |
| Water absorption, 30 minutes at 100°C, % by weight |
0.21–0.23 |
ISO 62 |
2.4 Electrical Properties
| Property |
Value |
Test Method |
| Dielectric strength, kV/mm (2 mm thick plate) |
26–28 |
IEC 60243-1 |
| Dielectric strength (3.68 mm, 4.0 kV at 140°C) |
>300 (passed) |
EN 50028 |
| Dielectric constant (εr) at 50 Hz, 25°C |
4.9 |
IEC 60250 |
| Dissipation factor (tan δ) at 50 Hz, 25°C, % |
5.3 |
ISO 60250 |
| Tracking resistance CTI, grade |
>600 |
IEC 60112 |
| Volume resistivity (ρ) at 25°C, Ω·cm |
1 × 10¹⁴ |
IEC 60093 |
| Electrolytic corrosion, Grade |
A-1.2 |
IEC 60426 |
3. Processing and Curing Guidelines
Araldite CW 1302 Resin contains fillers which tend to settle over time. It is therefore necessary to carefully homogenize the complete contents of the container before use. To prevent filler separation and inconsistent metering, the components should be gently stirred from time to time while they are present in production equipment storage tanks.
To facilitate stirring and handling, the highly filled component should be heated to 40–50°C in its original container (e.g., overnight in an oven) before adding the hardener.
After thorough mixing, the mixed material should be degassed under a 5–10 mbar vacuum to yield quality casting.
In a manufacturing environment, uncured impregnated parts will pick up moisture. Therefore, it is critical to fully cure the parts right after impregnation or immediately store uncured impregnated parts in a moisture-controlled area. To determine whether crosslinking has been carried to completion and final properties are optimal, relevant measurements should be carried out on the actual part or the glass transition temperature of the cured system should be measured.
Suggested curing process: 24 hours at room temperature (about 25°C) plus 6 hours at 60°C to yield parts with low shrinkage and best surface aspect.
Minimum curing condition: 48 hours at 25°C.
4. Typical Applications
5. FAQ
Q1: What is the mixing ratio?
By weight, resin:hardener = 100:11. By volume, resin:hardener = 100:19.
Q2: Can the system cure at room temperature?
Yes. The suggested process is 24 hours at 25°C plus 6 hours at 60°C. The minimum curing condition can be 48 hours at 25°C.
Q3: Why should the resin be preheated before processing?
The resin is a highly filled system. Heating to 40–50°C reduces viscosity and facilitates stirring and handling. The resin component should be heated before adding the hardener.
Q4: Is degassing required after mixing?
After thorough mixing, degassing under a 5–10 mbar vacuum is recommended to obtain quality castings.
Q5: What are the main applications?
Transformers, filters, capacitors, and electrical devices used in potentially explosive environments; suitable for casting or vacuum casting.
Q6: How should the product be stored and what is the shelf life?
Both resin and hardener should be stored sealed in original containers, in a dry place, at 2–40°C, away from direct sunlight. Shelf life is 1.5 years for the resin and 3 years for the hardener from date of manufacture. The hardener is moisture-sensitive; partially used containers should be closed immediately, and a desiccant venting device is highly recommended. The resin should not be stored for long periods above 40°C nor exposed to temperatures above 100°C for more than 2 hours. The hardener should not be stored at elevated temperatures (>80°C) for extended periods.
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