The film preparation method is as follows: polyamide acid solution flow forming film, stretching, high temperature imide.Thin film is yellow transparent, relative density 1.39 ~ 1.45, has outstanding high temperature resistance, radiation resistance, chemical corrosion resistance and electrical insulation properties, can be used in 250 ~ 280ºC air for a long time.The vitrification temperatures are 280ºC(Upilex R), 385ºC(Kapton) and above 500ºC (Upilex S), respectively.The tensile strength is 200MPa at 20ºC and greater than 100MPa at 200ºC.It is especially suitable for flexible printed circuit board base material and insulation material of various high temperature resistant electric motor.

Indicator name Unit Index value
Nominal thickness um 25 40 50 75 100 125
Thickness deviation um +4 +4 +7 +8 +7 +11
-3 -4 -6 -6 -7 -7
Tensile strength (vertical / lateral) um 165 165 165 165 165 165
Elongation at break (vertical/lateral) % 40 50 50 50 50 50
AC electrical strength (48Hz-62Hz) V/um 235 195 175 120
Slitting width range mm Allowable deviation
<26 ±0.4
26~102 ±0.8
>102 ±1.6
density kg/m3 1425±10
Melting point - Not melting
Relative permittivity 23 ° C 50Hz - 3.5±0.4
1KHz 3.4±0.4
Dielectric loss factor 23 ° C, 50 Hz or 1 Hz - ≤4.0×10-3
Volume resistivity Ω·m ≥1.0×1010
Surface resistivity Ω ≥1.0×1014
Dimensional stability (longitudinal and transverse shrinkage) (required only for thickness ≥25μm) 150ºC % ≤0.35
400ºC ≤2.5
Water absorption (wet 24h) % ≤4.0
Long-term heat resistance temperature index ºC ≥200

Q1:Are you a trading company or manufacturer?
We are a manufacturer, We have our own workshop producing electrical insulation polyimide film.
Q2: Can you send samples for testing?
A4 size Samples & Small rolls are free supplied, customers just need to pay a litter shipping charge.
Q3: How can you guarantee the quality of mass goods is the same as the sample sent to me before?
We kept another same sample and marked it on the company when we sent it to the customer. So our products will be based on and also we will test the product before shipment.
Q4: Which package do you use?
The package is an important part to avoid goods breaking in transportation. We will choose suitable packing depending on the materials.

Packed in rolls and carton; store at room temperature; avoid fire. The storage period is 12 months.

If you are interested please do not hesitate to contact us.