Technical Information


Typical technical information and properties of dielectric material for
flexible printed circuitry.

Property Units Polyimide Polymide
(Adhesiveless)		 Polyester
  Representative Trade Name - Polyimide Polyimide Mylar
  Physical
  Thickness Range mil .5 to 5 1 - 6 0.025 to .5
  Tensile Strength (at 25° C) psi 25,000 50,000 20,000 to 35,000
  Break Elongation % 70 50 60 to 165
  Tensile Modulus (at 25° C) 100,000 psi 4.3 .7 5
  Tear Initiation Strength lb/in 1000 700 - 1200 1000 to 1500
  Tear Propagation Strength g/mil 8 20 12 to 25
  Chemical
  Resistance to:
  Strong Acids - Good Good Good
  Strong Alkalis - Poor Good Poor
  Grease and Oil - Good Good Good
  Organic Solvents - Good Good Good
  Water - Good Good Good
  Sunlight - Fair Good Good
  Fungus - Non-nutrient Non-nutrient Non-nutrient
  Water Absorption (ASTM D570) % (24 hours) 2.9 .8 <0.8
  Thermal
  Service Temperature (min/max)
  Coefficient of Thermal		 degree C -200/+300 -200/ +350 -60/+105
  Expansion (at 22° C) PPM/ degree C 20 20 27
  Change in Linear Dimensions
  (100° C, 30 min)		 % <0.3 0.01 - 0.02 <0.5
  Electrical
  Dielectric Constant (ASTM D150)
  1MHz 		   3.4 3.4 3
  Dissipation Factor (ASTM D150)
  1MHz		   0.01 .003 0.018
  Dielectric Strength (ASTM D149)
  @ 5 mil thickness
  Volume Resistivity (ASTM D257)		 V/mil
ohm-cm		 3800
1.0E+16		 6000
1.0E+16		 3400
1.0E+16

 

Current Carrying Capabilities:

Copper Weight
AMPS 1/2 oz. (0.0007") 1 oz.
(0.0014")		 2 oz. (0.0028") 3 oz. 4 oz. 5 oz. 6 oz. 7 oz.

Width in Inches
0.5 0.013" 0.008" N/A N/A N/A N/A N/A N/A
1.0 0.028" 0.017" 0.013" N/A N/A N/A N/A N/A
1.5 0.040" 0.027" 0.020" N/A N/A N/A N/A N/A
2.0 0.053" 0.040" 0.030" 0.0235" N/A N/A N/A N/A
2.5 0.080" 0.060" 0.042" 0.0325" 0.0285" N/A N/A N/A
3.0 0.100" 0.083" 0.057" 0.045" 0.0387" N/A N/A N/A
4.0 0.160" 0.120" 0.088" 0.066" 0.055" 0.048" 0.043" N/A
5.0 0.225" 0.158" 0.118" 0.09" 0.074" 0.065" 0.059" 0.053"
6.0 0.285" (off chart) 0.195" 0.153" 0.117" 0.094" 0.082" 0.074" 0.0687"
7.0 N/A (off chart) 0.250" 0.187" 0.145" 0.124" 0.105" 0.0905" 0.082"
8.0 N/A (off chart) 0.307" 0.232" 0.180" 0.1485" 0.130" 0.122" 0.111"
This chart gives recommendations for width of conductor needed to carry current on different copper thickness.

 

Stripline Impedance:

Dielectric
Thickness		 Impedance
20 40 60
Conductor
Width = W
  0.002" 0.007" 0.004" N/A
  0.003" 0.012" 0.006" 0.003"
  0.004" 0.016" 0.009" 0.005"
  0.005" 0.021" 0.0012" 0.007"
  0.006" 0.026" 0.015" 0.008"
  0.007" 0.030" 0.018" 0.010"
  0.008" 0.0035" 0.020" 0.011"
  0.009" 0.039" 0.023" 0.013"
  0.010" 0.044" 0.026" 0.015"
Based on 1 oz. (0.0014") copper conductors separated by polyimide, with a dielectric constant of 3.4 at 1 Mhz. These are for estimation only.

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