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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)	Tensile Modulus (at 25° C)	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

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.

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.