TECHNICAL BULLETIN / PRINTED CIRCUIT BOARD FILM

Physical Properties of Polyester
Film Base—High Complexity PCB Starts With the Right Phototools—

March 2010 • TI-2598

GENERAL INFORMATION• KODAK ESTAR™ Thick Base• Clear Base, Uncoated• Polyethylene Terephthalate (PET)

Temperature Effects
Temperature
255° C (490° F)

Melting Point. Solid becomes fluid.

130° C (255° F)

Distortion and Shrinkage. Crystallization
Occurs.

>100° C (212° F)

Distortion can occur with non-uniform
heating.

100° C (212° F)

Shrinkage up to 0.15% occurs, stabilizesin 24 hrs.

82° C (180° F)

Shrinkage up to 0.06% occurs, stabilizes
in 48 hrs.

80° C (176° F)

Transition Temperature. Increase inVolume. Film loses some stiffness.

49° C (120° F)

Shrinkage up to 0.02% occurs, stabilizes
in 10 days.

• 7-mil thickness (0.007-inch, 178 um)
Thermal Coefficient of Expansion(length, width)0.001% / ° F (0.0018% / ° C)

Humidity Coefficient of Expansion 0.0008% / % RH(length, width)
Specific Gravity

1.39

Young's Modulus

6.8 x 105 psi

Poisson's Ratio < 1 year at room
temperature

0.25

Tensile Strength Yield ASTM
D882-67

13,500 psi

Tensile Strength Break ASTM
D882-67

25,600 psi

Elongation at Yield ASTM
D882-67

5.5%

Elongation at Break ASTM
D882-67

115%

Tear Strength Initiation Graves
Tear ASTM D1004-06

24 lbs.

Burning

Tear Strength Propagation Tongue 0.5 lbs.
Tear ASTM D1938-67
Toughness ASTM D882-67

21,500 lb. / cubic inch

Refractive Index at wavelength
589 nmN = 1.50 Vertical axis throughthickness
N = 1.64 Width direction inplane of sheet
N = 1.66 Length direction inplane of sheet

Note: The values in this table are not manufacturing
specifications. The values are averages of several
measurements, and are provided as a general guide tophysical properties.

©Eastman Kodak Company, 2010

Physical Behavior

Statement

480° C (900° F)
Auto-ignition
Temperature

Auto-ignition temperature at whichmaterial starts to burn without the benefitof an external spark.

Underwriters’
Laboratories (UL)
94V-2 Compliance

KODAK Films made on ESTAR Thick Base(178 um) meet or exceed therequirements contained in UL04V-2.

Flame Propagation
Rate:280 Seconds: for 178
um film
130 Seconds: for 102
um film

Films of this nature are classified as slow
burning, based on a standard burning test,
NAPM / ANSI IT9.6-1991. The UL Burning
Test method uses a 35-inch filmstrip thatis lit at the bottom edge by a gas flame.
The film is immediately relit if the flame
becomes extinct during the course of thetest. Total time for burning the entire strip
is inversely proportional to the flame
propagation rate.

Physical Properties of Polyester Film Base
MORE INFORMATION
For the latest version of technical support publications for
Kodak products, visit Kodak on-line at:
http://www.kodak.com/go/PCBproducts
If you have questions about Kodak products, call Kodak.
In the U.S.A.:
1-800-242-2424, Ext. 19, Monday–Friday
9 a.m.–7 p.m. (Eastern time)
In Canada:
1-800-465-6325, Monday–Friday
8 a.m.–5 p.m. (Eastern time)
From outside the US/Canada: 1-716-724-4000

Note: The Kodak materials described in this publication for
use with Kodak films are available from dealers who supply
Kodak products. You can use other materials, but you may notobtain similar results.

NOTICE: The sensitometric curves and data in this publication represent product tested under the conditionsof exposure and processing specified. They are representative of production coatings, and therefore do not
apply directly to a particular box or roll of photographic material. They do not represent standards or
specifications that must be met by Eastman Kodak Company. The company reserves the right to change andimprove product characteristics at any time.
Industrial Imaging

EASTMAN KODAK COMPANY • ROCHESTER, NY 14650
Physical Properties of Polyester Film
Base
KODAK Publication No. TI-2598

Kodak and Estar are trademarks.

Revised 3-10