Flex Circuit Material Properties


Typical Properties of Dielectric Material for Flexible Printed Circuitry

Property (Typical) Units Polymide Polymide (Adhesiveless) Polyester
Representative Trade Name   KAPTON KAPTON MYLAR
Physical
Thickness Range mil 0.5 to 5 1-6 2-5
Tensile Strength (@25°C) psi 25,000 50,000 20,000 to 35,000
Break Elongation % 70 50 60 to 165
Tensile Modulus (@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   Good Good Fair
Fungus   Non-nutrient Non-nutrient Non-nutrient
Water Absorption % (24 hours) 2.9 0.8 <0.8
Thermal
Service Temperature (min/max) degree C -125/+200 -125/+200 -60/+105
Coefficient of Thermal Expansion (@22°C) PPM/degree C 20 20 27
Change in Linear Dimensions (100°C, 30min) % <0.3 0.04-0.02 <0.5
Electrical
Dielectric Constant (ASTM D150) 1MHz   3.4 3.4 3
Dissipation Factor (ASTM D150) 1MHz   0.01 0.003 0.018
Dielectric Strength (ASTM D149)
@ 1 mil thickness
Volume Resistivity (ASTM D257)
V/mil
ohm-cm
6000
1.0E+16
6000
1.0E+16
3400
1.0E+16
Celebrating 65 Years of Manufacturing Excellence  Learn More →
America's Oldest. A History of Innovation.

Today at Epec, the customer comes first, and everything we do must be put through that filter. Whether it is developing e-commerce platforms to make it easier to work with us, or creating a NPI (new product introduction) process that helps our customers get to market faster, or the other 10 new projects we have in process, we must focus on building the new. By doing that every day, and by always making the customer our top priority, we plan on being here for another 65 years and then some.

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Celebrating 65 Years - Epec Engineered Technologies