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SEMI G13-88 © SEMI 198 1, 1996 1 SEMI G13-88 STA N DARD TEST METHOD FOR EXP A NSION CH A R ACTERISTICS OF MOLDI NG COMPOUNDS 1 Scope 1.1 This s pecification describes th e procedure for measuring the Coefficient of Therm…

SEMI G11-88 © SEMI 1981, 19963

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SEMI G13-88 © SEMI 1981, 19961

SEMI G13-88

STANDARD TEST METHOD FOR EXPANSION CHARACTERISTICS OF

MOLDING COMPOUNDS

1 Scope

1.1 This specification describes the procedure for

measuring the Coefficient of Thermal Expansion (CTE)

and Glass Transition Temperature (T

) of thermosetting

molding compounds.

2 Apparatus

2.1 Mold — Producing 0.1–0.2" c ubes or equivalent

with an aspect ratio of 0.8–1.

2.2 Transfer Press

2.3 Micrometer — (0.0001 accuracy)

2.4 Thermomechanical Analyzer — (TMA) (Dupont

Model 943, Perkin-Elmer TMS-1, or equivalent)

2.5 Recorder and Power Supply — (Dupont Model

990, Perkin-Elmer UUI, or equivalent)

2.6 Oven — (200° ± 5°C capabilit y)

3 Materials

3.1 Nitrogen (Gas)

3.2 Nitrogen (Liquid)

4 Sampling

4.1 Mold samples according to pro duct specifications.

4.2 Postcure the specimen in acco rdance with the

material specification, and allow two (2) hours for

cooling in a desiccator.

5 Procedure

5.1 Select a sample, making certain that all sides are

flat and smooth. Measure the height of the sample with

a micrometer to the nearest 0.0001 inch.

5.2 Place the sample into the TMA sample holder and

bring the expansion probe down slowly until it just

makes contact with the sample. Place sample on fixture

per Instruction Manual. Add 3.0–5.0 grams to weight

tray. Adjust the Linear Variable Differential

Transformer (LVDT) to bring the recorder pen on scale.

The LVDT is then zeroed with the zero switch.

Readjust LVDT, if necessary, to bring pen on scale.

5.3 In a nitrogen atmosphere, heat the sample at a rate

of 20°C/min. to its post-cure temperature.

5.4 Without changing LVDT or pr obe position, use

liquid nitrogen to cool the sample to a temperature at

least 100°C below the deviation from α

.1.

5.5 Heat the sample at a rate of 5°C/min. to at least

200°C.

5.6 Calculate α(CTE), using the formula:

CTE =

DL()DY()

()

°

°

°

°

°

°

where: L

(T+10°)

=Length at Temperature 10° higher than

temperature at which CTE is being measured. L

(T-

10°)

=Length at Temperature 10° lower than temperature

at which CTE is being measured

∆Y = Y axis sensitivity in mils./in

∆T = change in temperature (20°C)

L = initial sample height (mils)

K =

LIT CTE

EXP.CTE

for aluminum standard

5.7 Run two (2) samples for each lot and record the

average.

5.8 An aluminum standard should be run to determine

the calibration factor K for the Y (length) axis per 5.4

above, as necessary to insure the accuracy of the

instrument's calibration.

5.9 Temperature readings should b e calibrated

periodically per manual instructions.

6 Report

6.1 Data is to include the orientati on for which the

sample is measured (e.g., perpendicular to flow).

6.2 CTE is reported as a function o f temperature. CTE

is to be reported every 10°C increments.

6.3 Report molding conditions and post-mold cure

conditions.

6.4 Report specimen size.

NOTE: For many materials, the Glass Transition Temperature

(Tg) may be determined by drawing tangents to the curve at

the points of minimum and maximum slope. The point at

which the tangents intersect is the T

. The slopes of the lines

are referred to as α 1 (below T

) and α2 (above T

7 References

ASTM D 696

— Coefficient of Linear Thermo

Expansion Plastic