SynChem – Resins & Varnishes Voltatex® 4250 1-component-resin

Voltatex® 4250 is a yellow-brown, ready-to-use impregnating 1K dip resin based on unsaturated polyesterimide resins.

  • single component
  • free of styrene and vinyltoluene
  • low emission
  • minimum exposure to the working area
  • no risk of fire and explosion hazards
  • not classified as dangerous in the meaning of transport regulations

Voltatex® 4250 is designed for the combined Electrical/UV-process. The product can be cured in conventional ovens as well.
The cured resin compound is characterized by:

  • high thermal and mechanical strength, especially under long-term stress
  • good resistance to solvent gases
  • resistance to refrigerants

 

 

 

Download datasheet

Application

  • electric motors and large drives
  • hermetic motors
  • transformers, especially with thick wires and shaped conductors
  • suitable for: Insulation systems up to thermal class 220 (R)

Standards

  • UL-File-Nr.: E101752 (M) Underwriters Laboratories Inc, USA
  • RoHS-compliant 2011/65/EU
  • REACh-compliant 2006/121/EU
  • Thermal class 220 (R) acc. to IEC 60085:2007
  • Temperature Index in acc. with IEC 60455-3-5
  • Testing Method in acc. with IEC 60216 Type 220
  • Temperature class in acc. with UL 1446:
Twisted Pair ASTM D2307 MW 30:200
    MW 35:220
Helical Coil ASTM D2519 MW 30:240
    MW 35:220

 

 

 

 

Electrical Insulation Systems in acc. with UL 1446:

Class 130 C190HE
  R150HE
  Z130HE
  Z150HE
Class 155 C290HE
  CZ255HE
  R201HE
  R203HE
  Z200HE
Class 180 R342HE
  R342HE2

Delivery forms

Voltatex® 4250 is supplied in one-way-cans containing 25 kg and 200 kg. Additionally 1000 kg containers (returnable) are available (not for oversea export).

Storage

In closed original packaging the resin can be stored for more than 6 months if provided storage temperature does not exceed 25 °C. Opened containers have to be closed immediately to protect the material from daylight!

Hardening

Voltatex® 4250 is a low emission product; nevertheless 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 the curing zone should be kept to the minimum permitted by safety considerations.

Dependent on the thermal and mechanical requirements we recommend two successive electrical curing cycles of 10 - 20 min each at 150 – 180 °C and – in parallel to the second curing cycle – a UVA-radiation phase with an output of > 25 mW/cm² for the Electrical/UVprocess.

Protection

Cured Voltatex® 4250 is biologically inactive and not dangerous to health. When processing the liquid resin, please refer to the Material Safety Data Sheet (MSDS) for Voltatex® 4250.

Cleaning

Cured Voltatex® 4250 is almost insoluble. Therefore, application equipment should be regularly cleaned with cleaner Voltatex® T050. All equipment cleaning and maintenance should be carried out in accordance with the equipment manufacturer’s instructions.

Processing

In combination with the Electrical/UV-process Voltatex® 4250 provides a customized adjustment of the impregnating quality paired with maximum material efficiency. As we cannot foresee all possible designs and applications in this Technical Data Sheet please get in contact with our Technical Representatives for further advice and support, such as trials in our technical laboratory as well as our expertise related to equipment design and production scale-up.

Unlimited tank stability with resin Voltatex® 4250 can be achieved as long as the material is kept below 25 °C and at least 20 % of the tank content is used and replaced with fresh resin per month.

Technical data

Mechanical
Property Unit of measure Values  Test method 
Bond strength of twisted coils room temperature  190 ± 40 IEC 60455-2 Test method A to IEC 61033
Bond strength of twisted coils 130 °C  50 ± 10 IEC 60455-2 Test method A to IEC 61033
Bond strength of twisted coils 155 °C  40 ± 10 IEC 60455-2 Test method A to IEC 61033
Bond strength of twisted coils 180 °C  35 ± 10 IEC 60455-2 Test method A to IEC 61033
Shore D hardness room temperature    68 ± 5 IEC 60455-2 Test method to ISO 868
Thermal
Property Unit of measure Values  Test method 
Temperature index  °C  220 IEC 60455-3-5, test method acc. IEC 60216
Bond strength IEC 60317-8  °C  MW 30:238 IEC 61033, method B, final point 22 N
Bond strength IEC 60317-13  °C  MW 35:229 IEC 61033, method B, final point 22 N
Testing voltage IEC 60317-2  °C  MW 30:212 IEC 60172
Testing voltage IEC 60317-13  °C  MW 35:222 IEC 60172
Heat conductivity  W(m*k)^-1  0.23 acc. ISO 22007-2.0
Chemical
Property Unit of measure Conditions  Values  Test method 
Water absorption  after 96h at 23 °C 0.8 company standard Energy Solutions-015
Resistance    Distilled water, transformer oil, 5 % soap-flock-dilution resistant company standard Energy Solutions-017
Resistance    R22 Shell 22-12 resistant Werknorm Energy Solutions - VOLTATEX 019
Resistance    Hexane, methanol, acetone, xylene resistant company standard Energy Solutions-019
Liquid phase
Property Unit of measure Bedingung  Values  Test method 
Impact on enamelled wires      compatible with all common magnet wires  
Curing time  min  150-180 °C 2 x 10-20 Electrical-UV-Process
Reaction process reaction time  min  100 °C 10.5 acc. company standard Energy Solutions-014
Reaction process gel time  min  100 °C 9 acc. company standard Energy Solutions-014
Viscosity  mPas    (2250 ± 350) at 25 °C acc. DIN 53019
Electrical
Property Unit of measure Values  Test method 
Dielectric strength at 23 °C and 50 % r.h.  kV/mm  80 IEC 60455-2 Test method in acc. with IEC 60243-1
Dielectric strength at 155 °C  kV/mm  80 IEC 60455-2 Test method in acc. with IEC 60243-1
Dielectric strength at 23 °C after 96 h storage at 92 % r.h.  kV/mm  65 IEC 60455-2 Test method in acc. with IEC 60243-1
Dielectric strength at 105 °C after 168 h oil immersion  kV/mm  95 IEC 60455-2 Test method in acc. with IEC 60243-1
Specific volume resistance at 155 °C  Ω*cm  1x10^9 IEC 60455-2 Test method in acc. with IEC 60093
Specific volume resistance at 180 °C  Ω*cm  8x10^8 acc. IEC 60455-2, test method acc. IEC 60093
Loss factor cross section 0.2=200x10^-3  °C  65 IEC 60455-2, test method in acc. with IEC 60250