Structural Void Filling Compound 3550 B/A FST

Technical Datasheet

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Typical Product Performance (continued)

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.

Flammability Properties

Tested according to vertical mode to F.A.R. 25.853 (a) and (d).

Properties

Test Method

Condition

Average

Target Maximum

(JAR /FAR 25.853(a)(d)

App. F Part I, V

Flammability 12sec vertical

FAR/JAR/CS

burn length

0.93" (23.5 mm)

6 inches

25.853(a) App F,

after flame

0 sec

15 sec

part I(a)(1)(ii)

drips time

0 sec

3 sec

Flammability 60sec vertical

FAR/JAR/CS

burn length

2.5" (63.4 mm)

6 inches

25.853(a) App F,

after flame

0 sec

15 sec

part I(a)(1)(ii)

drips time

0 sec

3 sec

Optical smoke density

FAR/JAR/CS

102.4 Ds max

200 Ds

Ds (4 min flaming mode)

25.853(d) App F,

part V(b)

Toxic gases emission

Airbus ABD0031

HF

< 1 ppm

100 ppm

(flaming mode)

Boeing D6-51377

HCI

< 1 ppm

150 ppm

HCN

13.0 ppm

1,000 ppm

< 10 ppm

100 ppm

CO

213.3 ppm

1,000 ppm

8.3 ppm

100 ppm

Product Application

Surface Preparation:

A cleaned, dry, grease free surface is essential for maximum performance. For repeatable results the void-filler

and the surfaces should have a temperature between 68-77°F (20-25°C).

Mixing

Scotch-Weld 3550 B/A FST Compound can be mixed manually or automatically (using static mixer, minimum

18 elements, 13mm id). For repeatable performance keep mixing ratio in a range of ± 5% (100:50cc/100:52g).

Dual Cartridge application provides maximum accuracy and easy handling. Scrap the first 2 cc when using a

new mixer. For manual mixing, mix the compound until visually homogenous. From the start of mixing the work

life is 120 min (3.5 oz or 100g mixture) at 73°F (23°C). For ease of extrudability the product can be raised to a

temperature of 75°F (25°C) but not greater than 110°F (43°C). Bulk pumping & mixing equipment

recommendations are available upon request.

Curing Conditions

A minimum cure time of 48 hours at room temperature is recommended to obtain the optimum mechanical

properties of the product. Heat application accelerates the curing cycle.

Clean up of Void-Filler:

Uncured void-filler can be wiped with solvent e.g. Methylethyl-ketone (M.E.K). Cured material can be cleanly

removed mechanically.