Structural Void Filling Compound 3550 B/A FST

Technical Datasheet

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Typical Product Performance

Note: The following technical information and data should be considered representative or typical only and should

not be used for specification purposes. The following mechanical and physical data is based on Scotch-Weld

3550 B/A FST Compound.

Physical Properties

Thermal expansion:

The low-density void-filler was manually mixed and carefully filled into mold with inner dimensions of

approximately 2" x 2" x 8" (50 x 50 x 200 mm). Filler block was cured 14 days at 74°F (23 ± 2°C). The block

was machine milled into 20 individual specimens of dimensions 0.3” x 0.3” x 0.6” (7 x 7 x 15 mm) with a

tolerance of ± 0.004" (± 0.1 mm). The coefficient of thermal expansion (C.T.E.) was then determined per ASTM

stabilization at -40°F (- 40°C), three specimens of each lot were scanned at a rate of 2°C/min from -40°F to

392°F (-40°C to 200°C). The coefficient of thermal expansion was determined on the two linear portions of the

curve below and above the glass transition temperature of the product.

Exothermicity:

Round cups were filled with approximately 3.5 oz (100 grams) of the void-filler. A thermocouple was placed in the

center of the void-filler. Cure cycle is 74°F (23 ± 2°C) during 14 hours.

Cured density:

The cured density was determined on individual specimens cut from a cured block of void-filler with a band saw.

The density was calculated by dividing the mass of the specimen by its measured volume. The density was

expressed in g/cc.

Volatiles test:

Approximately 1 oz (30 grams) of the void-filler was spread onto a circular surface of a metal pan having a

diameter of about 3.3" or 85 mm. After weighing the specimens, they were cured 48h @ 74°F (23 ± 2°C) and

then reweighed.

Properties

Test Method

Average

Thermal Expansion

ASTM E-831

1.1E-04 /°C @ 14 to 176°F (-10 to 80°C)

1.4E-04 /°C @ 176 to 410°F (80 to 210°C)

Extrudability

AITM 7-0003 (B) (see 4.3.8.6)

3.0 oz/min (85 g/min)

Exothermicity

AIMS 10-03-000 (4.2.8.3) ∆T

7.5°F (4.5°C)

Cured Density

ISO 1183

0.57 ± 0.05 g/cc

Volatile Content

AIMS 10-03-000 (4.2.8.1)

0.03 %

DSC Scan:

Tooling

• DSC Q2000 from TA Instruments with auto sampler and RCS cooling system.

• Two point calibration with Indium and water.

• The sample head was flushed with nitrogen gas, 25ml/min purge rate.

Sample Preparation

For the measurement of the fresh mixed sample: part of the fresh mixed paste was weighed into a hermetic Al

pan. The rest of the mixed paste was stored at RT in the lab and used for the measurement after 2 days & 7 days.

For these samples: parts of the hard brittle material was cut out and weighed on an Al pan with holes in the lid.

Program Steps

(1) Equilibrate at -50°C

(5) Isothermal for 10 min

(2) Ramp 10°C/min to 250°C

(6) Mark end of cycle 1

(3) Mark end of cycle 0

(7) Ramp 10°C/min to 250°C

(4) Ramp 20°C/min to -50°C

(8) Mark end of cycle 2