SynChem – Resins & Varnishes Dolphon® XL-2102 1K Resin

Dolphon® XL-2102 is a transparent, low emission, 1K resin based on polyester.

Dolphon® XL -2102 is characterised by the following properties:

  • Excellent wetting properties
  • Approved for railway applications acc. EN 45545-2: HL3 for R22 and R23
  • Low weight loss on cure
  • Very low odour
  • Relatively fast cure cycles
Download datasheet


Dolphon® XL-2102 is a proven resin for impregnating stators, rotors, transformers, traction coils and inductances.


  • UL-approved Class H (180 °C), File OBOR2.E317427 and OBJS2.E317429
  • UL-System-approved 130 - 220 °C
  • RoHS-compliant 2011/65/EU
  • REACh-compliant 2006/121/EU

UL-approved with magnet wire temperature class according to UL 1446:

Magnet wire Twisted pairs Helical coils
MW 16-C 220 °C -
MW 28-C 130 °C -
MW 35-C 180 °C 200 °C

Delivery forms

Dolphon® XL-2102 is delivered in 25 kg disposable containers, 230 kg barrels and 1000 kg containers.


Dolphon® XL -2102 can be stored for 12 months at room temperature in a sealed container (max. 30 °C). The dip resin must be stored in a suitable place and protected against direct sunlight, UV radiation and sources of heat.

Always observe general rules and regulations.


The curing time commences once the object temperature
has been reached.

Typical curing time:
at 150 °C - 1 h*
ab 130 °C - 3-4 h*

*(Full curing is measured by DSC. The time must be taken after units reach the baking temperature). For objects having to endure high mechanical or chemical stress during service, longer curing times are recommended.


Cured Dolphon® XL-2102 is biologically inactive and safe to health. Always refer to the safety data sheet and implement protective measures when processing the liquid dip resin.


Since the cured dip resin is practically insoluble, the tools have to be cleaned as soon as possible with a suitable solvent. Maintenance and care of impregnating plants, especially cleaning, must be carried out according to operational requirements. Always refer to the user manual of the plant.


Exemplary impregnating process suggestion:

1. Preheat the units at 50-60 °C (max.)
2. Dip into the resin for 30-60 min.
3. Drain for 1 h min.
4. Bake 1 h at 150 °C* (see "Curing")

For the VPI application the cycle must be set for each type of machines. Feel free to contact us.

Technical data

Property Unit of measure Conditions  Value  Test method 
Gel time  min  100 °C 30-45 min.  
Weight loss  10 g cured 1 h at 150°C < 3.5 %  
Bond strength  at 25 °C >180 IEC 61033, HC, 1h/150 °C
Bond strength  at 80 °C >90 IEC 61033, HC, 1h/150 °C
Bond strength  at 155 °C >30 IEC 61033, HC. 1h/150 °C
Property Unit of measure Bedingung  Werte  Prüfmethode 
Heat conductivity  W/mK    0.25-0.30  
Property Unit of measure Conditions  Value  Test method 
Water absorption  90 min at 100 °C 1.5 ASTM D 570
Water absorption  24h at 25 °C <1.5 ASTM D570
Resistance    Xylene, Methanol, Hexane yes IEC 60464-2
Resistance    10% hydrochloric acid < 2.5 % ISO 175 - 7 d storage
Resistance    30% sulfuric acid < 1.5 % ISO 175 - 7 d storage
Resistance    transformer oil < 0.5 % ISO 175 - 7 d storage
Resistance    unleaded gasoline < 1.5 % ISO 175 - 7 d storage
Resistance    cleaning agents < 1.5 % ISO 175 - 7 d storage
Liquid phase
Property Unit of measure Bedingungen  Werte  Prüfmethode 
Specific density  g/l  at 25 °C 1120±30  
Viscosity  at 25 °C 80-120 ISO 6 Cup
Viscosity  at 25 °C 110-170 Ford Cup 4
Property Unit of measure Conditions  Value  Test method 
Dielectric strength  kV/mm  0.025 mm film >128 ASTM D-115
Volume resistivity  Ω x cm    >10^15 IEC 60464-2
Volume resistivity  Ω x m  after 7 d water storage >10^12 IEC 60464-2
Surface resistivity  Ω    >10^15 IEC 60464-2
Dielectric constant    at 25 °C 3.3 ASTM D-150
Creep resistance    CTI 600 M IEC 60112