SynFlex Group:
Synflex
Please tell us
Menu
SynTherm® – Insulating Materials

Melinex® 238

Melinex® 238 is a flexible, white polyester film with a matt surface.

Attributes

According to its UL classification, Melinex® 238 has a relative thermal index of 140 °C, a mechanical RTI of 130 °C and displays excellent ageing resistance compared to common polyester films with a higher oligomer content. Furthermore,  Melinex® 238 displays very high dielectric strength, minimum changes to dielectric values, excellent mechanical properties and very good hydrolytic stability. The half life period of the mechanical properties is twice as high.

Application

Melinex® 238 was specially developed for use in electric motors with particular chemical exposure as slot insulation, phase insulation and wedges. Due to its low oligomer extraction it is particularly suitable for use in hermetic motors with refrigerants.

Standards
  • UL approved, file no. E 93687
  • RoHS compliant according to 2011/65/EU
Delivery forms

Film thicknesses in µm:
125, 190, 250, 350

Melinex® 238 can be supplied:

  • in slit rolls from widths of 6 mm (depending on thickness) and above
  • in rolls up to widths of 1100 mm

Overall diameter of the slit rolls/ rolls
approx. 240, 330 or 450 mm.

Feathering:

  • depth approx. 1 - 12 mm, distance approx. 1 - 10 mm
  • from widths of 10 to 240 mm and thickness of 0.125 mm
Base

Polyethylenterephthalate

Technical data
Mechanical
Total thickness  Oligomer extraction  Tensile strength longitudinal  Tensile strength transversal  Elongation at break longitudinal  Elongation at break transversal 
Unit of measure         Test method 
µm  125 190 250 350  
0.7 0.7 0.7 0.7 24 h in boiling Xylen
N/mm²  200 200 200 190 ASTM D 882
N/mm²  200 200 200 180 ASTM D 882
160 160 180 200 ASTM D 882
160 160 180 200 ASTM D 882
Thermal
Total thickness  Shrinkage longitudinal  Shrinkage transversal 
Unit of measure Conditions          Test method 
µm    125 190 250 350  
5 min. at 190°C 3.6 3.0 2.5 2.5 ASTM D1204-78
5 min. at 190°C 2.8 2.5 2.0 1.5 ASTM D1204-78
Electrical
Total thickness  Volume resistivity  Dielectric strength 
Unit of measure         Test method 
µm  125 190 250 350  
Ω x m  10^14 10^14 10^14 10^14 ASTM D257-83 (100V DC at 25 °C and 1000s)
kV  16 20 25 26  

Mylar®, Melinex® are registered trademarks of DuPont Teijin Film U.S., Ltd. Partnership.