SynChem – Resins & Varnishes Synthite AC-41 Polyurethane varnish

Synthite AC-41 is an air drying finishing varnishes based on polyurethane.

Synthite AC-41 has the following excellent properties:

  • fast drying - units can be handled in 30 min.
  • easy application (dipping, brushing, spraying)
  • hohe Temperaturbeständigkeit
  • superior abrasion resistance
  • excellent adhesion to most surfaces
  • transformer oil resistance ASTM D 155-55
  • corrosion and humidity resistance
Download datasheet


Electrical engineering and electronic devices.


Class H (180 °C) acc. UL 1446, MW 35-C, Twisted Pairs.

Delivery forms

4.5 kg, 22.5 kg and spray bottles on request.






Store in cool dry place (max. 30 °C) away from direct sunlight. Protect from moisture and humidity. Shelf life is 36 months when stored in closed original container at max. 30 °C.


Curing is possible in explosion protected environments under a fume hood at ambient conditions:
Air drying times at 25 °C:

  • 10 min. dust-dry
  • 1 h touch-proof
  • 48 h cured


Cured Synthite AC-41 is biologically inactive and safe to health. Always refer to the safety data sheet and implement common protective measures when processing the varnish.


Clean tools with thinner T 200 in time. Maintenance and care of coating equipment, especially cleaning, must be carried out according to operational requirements. Always refer to the user manual of the equipment. 


When spray-coating with thinner T 200, Synthite AC-41 is adapted to processing viscosities in common manual spraying nozzles. Usually you 20-25 % thinner. It is possible to adjust the viscosity with T200 for dip coating. Before longer air contact, ensure that the dipping bath surface does not become dry by placing a nitrogen blanket. Synthite AC-41 is supplied ready-to-use for brushing application. Recommended coating thickness: less than 30-40 µm.

Always observe the specifications on the safety data sheet and relevant safety organisation regulations. 

Technical data

Property Unit of measure Conditions Value Test method
Coating thickness µm 60-75 ASTM D-115
Property Unit of measure Conditions Value Test method
Dielectric strength kV/mm dry / 0.025 mm film thickness 80
Dielectric strength kV after 24 h water immersion / 0.025 film thickness 48 ASTM D-115
Property Conditions Blistering Rusting Cracking Test method
Resistance Water no no no ISO 4628/2-3-4
Resistance 1% Natrium hydroxide no no no ISO 4628/2-3-4
Resistance saltwater no no no ISO 4628/2-3-4
Resistance 10 % sulfuric acid no no no
Resistance no
Liquid phase
Property Unit of measure Conditions Values Test method
Dilution 4:1
Specific density g/l 25 °C 900±20
Viscosity s 25 °C 50-65 Ford Cup 4
Viscosity s 25 °C 40-60 ISO Cup 6