SynChem – Resins & Varnishes Voltatex ® 4020 1-component resin

Voltatex® 4020 is a styrene based, thermosetting, ready-to-use, blue-grey pigmented one pack ready-to-use imprgnating resin with high capillary activity, based on unsaturated polyesterimide resins.

  • single component
  • coverage of rust
  • improved protection against climate influences
  • high efficiency due to favourable curing conditions
  • excellent impregnating result at low material consumption

The cured resin compound is characterized by:

  • good resistance against solvent gases 
  • thermal long therm stress
Download datasheet


Suitable for:

  • Insulation systems of thermal class 200 (N)

Impregnating of:

  • transformers
  • stabilisers


  • UL-File-Nr.: E 101752 (M) Underwriters Laboritories Inc., USA
  • Isolation-system temperature of thermal class 200 (N) acc. to IEC 60085:2007
  • Temperature index in acc. with IEC 60455-3-5, Type 200
  • Testing Method in acc. with IEC 60216
  • 2003/11/EU (polybromited diphenylether)
  • RoHS-compliant 2011/65/EU
  • REACh-compliant 2006/121/EU
  • Temperature class acc. to UL 1446:
Twisted Pair ASTM D2307 MW 30:200
    MW 35:200
Helical Coil ASTM D2519 MW 35:200

Insulation-system acc. to UL 1446 (IEC 61858):

Class 130 C190HE
Class 155 C290HE
Class 180 R342HE

Delivery forms

Voltatex® 4020 is delivered in 20 kg one-way-cans.


The resin can be stored for up to 4 months at max. 25 °C if sealed correctly in original containers. Opened containers have to be resealed and protected against direct daylight!


In order to minimize evaporation of reactive components while curing the impregnated objects should be heated up to the curing temperature in the shortest possible time. The air flow in curung oven should be kept to the minimum permitted by safety considertions.

Curing times: at 150 °C: 2-3 h


Voltatex® 4020 is biologically inactive and safe to health. Implement normal protective measures when processing the liquid dip resin: See the Material safety data sheet (MSDS).


Once cured Voltatex® 4020 is almost insoluble. Threfore, application equipment should be cleaned regularly with cleaner
Voltatex® T050. All equipment cleaning and maintenance should be carried out in accordance with the equipment manufacuter's instructions.


The impregnating Resin can be applied by using:

  • all kind of conventional dip & bake equipment
  • continuous and vacuum dip processes
  • VPI process

Unlimited tank stability can be achieved as long as Voltatex® 4020 is kept below 25 °C and at least 10 % of the tank content is used and replaced with fresh resin per month. Cooling of the resin is needed provided the ambient temperature is exceeding the recommended maximum temperature. In order to avoid sedimentation of pigments Voltatex® 4020 need to be stirred up in the delivered packaging prior to filling into the tank. Additionally, to keep the material homogneously while processing, a continouos or repetitive stirring schedule has to be set up. It is highly recommended to install a motor-powered stirring unit in the storage tank. For optimum process viscosity it is possible to add Voltatex® T031.

Technical data

Property Unit of measure Conditions  Values  Test Method 
Bond strength of twisted coils  room temperature 180 ± 30 IEC 60455-2, test method A acc. IEC 61033
Bond strength of twisted coils 130 °C    35 ± 10 IEC 60455-2, test method A acc. IEC 61033
Bond strength of twisted coils 155 °C    35 ± 10 IEC 60455-2, test method A acc. IEC 61033
Bond strength of twisted coils 180 °C    30 ± 10 IEC 60455-2, test method A acc. IEC 61033
Shore-D-hardness    room temperature 37 ± 5 IEC 60455-2, test method acc. ISO 868
Property Unit of measure Bedingungen  Value  Prüfmethode 
Temperature index  °C    200 IEC 60455-3-5 test method acc. IEC 60216
Testing voltage IEC 60317-8  °C  MW 30 210 IEC 60172
Testing voltage IEC 60317-13  °C  MW 35 200 IEC 60172
Bond strength IEC 60317-13  °C  MW 35 211 IEC 61033, method b, final point 22 N
Property Unit of measure      
Water absorption  after 96h at 23°C 0.35 IEC 60455-2, test method 1 acc. ISO 62
Impact on enamelled wires      compatible to common enamelled wires  
Resistance    Distilled water, transformer oils, 5% soap-flock-dilution resistant  
Resistance    Hexane, methanol, oil resistant  
VOC acc. 31. BLmSchV      app. 11.7 % volume DIN EN 60455-3-5:2006
Liquid phase
Property Unit of measure Value  Test Method 
Flow time  60 ± 15 at 23 °C acc. DIN 53211
Reaction process gel time  min  15.0 ± 4.0 at 100 °C acc. Axalta company standard 0012)
Reaction process reaction time  min  31 ± 9.0 at 100 °C acc. Axalta company standard 0012)
Property Unit of measure Conditions  Values  Test Method 
Specific volume resistance at 155 °C  Ω*cm    5.0x10^11 acc. IEC 60455-2, test method acc. IEC 60093
Creep resistance    typ. value CTI 600M acc. IEC 60455-2, test method acc. point 6.2 IEC 60112
Dielectric constant at 155 °C and 50 Hz      4.0 ± 0.5 acc. IEC 60455-2, test method acc. IEC 60250
Loss factor    120 °C/50 Hz 195x10^-3 IEC 60455-2, test method acc. IEC 60250
Loss factor cross section 0.2=200x10^-3  °C    120 IEC 60455-2, test method acc. IEC 60250