ARALDITE® CW 2245 / ARADUR® HY 956

ARALDITE® CW 2245 / ARADUR® HY 956 is an optimally filled casting system for processing and curing at room temperature or slightly higher temperatures. ARALDITE® CW 2245 is a modified, solvent-free epoxy resin containing an inorganic filler. ARADUR® HY 956 is a low-viscosity polyamine hardener.

RTU Product Type: Casting Resin

Product End Uses: Switches, Transformers, Voltage Regulator

Chemical Family: Epoxy & Epoxy Derivatives

Composites Processing Methods: Casting, Vacuum Casting, Vacuum Pressure Casting

Features: Flexible Casting, High Flexibility, Low Viscosity, Room Temperature Curing, Thermal Shock Resistant

Enhanced TDS

Identification & Functionality

Features & Benefits

Ready-to-Use Product Features
Product Features
  • Low viscosity.
  • Flexible castings.
  • Good thermal shock resistance.

Applications & Uses

Application Area
Composites Processing Methods
Product End Uses
Markets
Applications
Processing Information
  • Preparation CW 2245 contains fillers, which tend to settle over time. It is therefore recommended to carefully homogenize the complete contents of the 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.
  • Mixing The casting mix is best prepared by heating the resin up to 40 – 50 °C before stirring in the hardener. Brief degassing of the mix under 5 – 10 mbar vacuum improves the mixture homogeneity and enhances the dielectric properties of the castings.
  • Curing To determine whether cross-linking 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 gel and cure cycles in the customer’s manufacturing process could lead to a different degree of cross-linking and thus a different glass transition temperature.
Application Information
  • Voltage regulators.
  • Suppressor chokes.
  • Proximity switches.
  • Ferrite core transformers.
Processing Methods

Casting; vacuum casting.

Regulatory & Compliance

Certifications & Compliance

Technical Details & Test Data

Electrical Properties

Electrical Properties: at 23°C. Cured for 24h/RT + 6h/60°C.

Dielectric strength (2 mm specimen) 16 kV/mm IEC 60243-1
Dielectric loss factor (tan δ, 50Hz, 25°C) 4.9 % IEC 60250
Dielectric loss factor (tan δ, 50Hz, 40°C) 7.4 % IEC 60250
Dielectric loss factor (tan δ, 50Hz, 60°C) 12.3 % IEC 60250
Dielectric constant (εr, 50Hz, 25°C) 5   IEC 60250
Dielectric constant (εr, 50Hz, 40°C) 5.75   IEC 60250
Dielectric constant (εr, 50Hz, 60°C) 7.6   IEC 60250
Tracking resistance (CTI) >600   IEC 60112
Electrolytic corrosion A/1.2   IEC 60426
Volume resistivity (ρ, 25°C) 2x10¹⁴ Ω cm IEC 60093
Volume resistivity (ρ, 40°C) 4x10¹³ Ω cm IEC 60093
Volume resistivity (ρ, 60°C) 4x10¹¹ Ω cm IEC 60093
Mechanical & Physical Properties

Mechanical and Physical Properties: at 23°C. Cured for 24h/RT + 6h/60°C.

Glass Transition Temperature 63 °C
Specific Gravity 1.61 g/cm³
Tensile Modulus 5500 MPa
Tensile Strength 36 MPa
Elongation at Break 0.8 %
Coefficient of Thermal expansion (Alpha 1 < Tg) 69 ppm/K
Thermal Conductivity 0.67 W/mK
Hardness 80 Shore D
Flammability V-0 (6 mm)  
Water Absorption (1 day at 23°C) 0.17 % by wt.
Water Absorption (30 min at 100°C) 0.23 % by wt.

Storage & Handling

Storage Conditions
  • Store the components in a dry place according to the storage conditions stated on the label in tightly sealed original containers.
  • Under these conditions, the shelf life will correspond to the expiry date stated on the label.
  • After this date, the product may be processed only after reanalysis.
  • Partly emptied containers should be tightly closed immediately after use.

Other

Application Information
ValueUnitsTest Method / Conditions
Mix Ratio0.09 %(W)%(W)Hardener : Resin