SynChem – Resins & Varnishes Synthite AC-43 Air drying varnish

Synthite AC-43  is a clear, air drying electrical insulation varnish on basis of modified polyester, suitable for class H.

Synthite AC-43 has the following excellent properties:

  • UL-approved
  • very fast air drying
  • excellent chemical resistance
  • solderable
  • excellent adhesion
  • good penetration
  • transformer oil resistance ASTM D 155-55
  • corrosion and humidity resistance
Download datasheet

Application

Typical applications for Synthite AC-43 are:

  • stators
  • printed circuit boards
  • form wound coils
  • resistors
  • transformers
  • capacitors

Standards

Class H (180 °C) UL-file-no. OBOR2.E317427 and OBJS2.EB17429.

Magnet wire Twisted pairs Helical coils
MW 24-C 155 °C 155 °C
MW 28-C 130 °C 130 °C
MW 35-C 180 °C 180 °C

 

 

 

 

Delivery forms

Colour: clear
4.5 kg, 22.5 kg and spray bottles on request.

Storage

Synthite AC-43 can be stored at room temperature and in closed containers for up to 36 months (max. 30 °C). The varnish has to be stored in cold, dry places, protected against direct sunlight.

Hardening

Air drying time (on copper plate):
10 min. - set to touch
Baking of 20-30 min. at 150 °C will provide a film with optimum toughness and bond strength.

Protection

Use in well ventilated area, aboid contact with skin and eyes and wear protective clothes. Please observe the safety data sheet.

Processing

Synthite AC-43 may be applied by dipping, brushing or spraying as supplied.
For fast conveyor application, the following cycle is recommended:
1. Preheat units for 10 min. at 110 °C
2. Dip into the varnish for 30 sec.
3. Drain 10-20 min.
4. Bake 60-90 min. at 110 °C
For this type of cycle Synthite AC43 should be diluted 10-15 % with Dolph's® T-200 thinner.

Technical data

Mechanical
Property Unit of measure Bedingung  Werte  Prüfmethode 
Coating thickness  µm    75-100 ASTM D-115-55
Chemical
Property Conditions  Blistering  Rusting  Cracking  Test method 
Resistance  Water no no no ISO 4628/2-3-4
Resistance  10 % Sulfuric acid no no no ISO 4628/2-3-4
Resistance  1 % Sodium hydroxide no no no ISO 4628/2-3-4
Resistance  Salt water no no no ISO 4628/2-3-4
Liquid phase
Property Unit of measure Conditions  Values  Test method 
Viscosity  25 °C 50-70 ISO Cup 4
Viscosity  25 °C 18-24 Ford Cup 4
Specific density  g/l  25 °C 900±30  
Electrical
Property Unit of measure Conditions  Value  Test method 
Dielectric strength  kV/mm  dry / 0.025 mm film thickness 80 ASTM D-115
Dielectric strength  kV/mm  after 24h water storage / 0.025 mm film thickness 48  
Creep resistance    CTI 600 M IEC 60112