3M™ Scotch-Weld™ Void Filling and Edge Sealing Compound EC-3524 B/A is a

two-part flame retardant epoxy. Scotch-Weld EC-3524 B/A Compound can be used

for void filling, edge sealing, and as an abradable compound in aircraft engines. It is

available in blue or off-white when mixed.

Features • Sandable within three hours of mixing.

• Cures to a strong, low-density material within 48 hours at 75°F (24°C).

• Meets the flammability requirements of F.A.R. 25.853 (a) and (b).

• The compound has thixotropic properties for ease of application.

• Base comes in blue or pale blue, accelerator is white to ensure complete and

uniform mixing.

• Can be used as a fairing compound for aerodynamic flushness.

• Reinforces honeycomb.

• Can be used for bonding inserts.

• Service temperature of 250°F (121°C).

• 100% solids.

• Seals and provides impact resistance to honeycomb panels edges.

• Paintable

100 grams of 3M™ Scotch-Weld™ Void Filling and Edge Sealing Compound

EC-3524 Part B and 94 grams of Part A were hand (spatula) mixed for 2-3 minutes

then cast into a block 2 in. x 3 in. x 6 in. and cured 48 hours at ambient laboratory

conditions. The following typical data were obtained on specimens cut from the

cured block.

Density 29.3 - 31.2 lbs./ft.3 (0.47 - 0.50 grams/cc)

Tg = 137°F (54°C)

Compressive Strength (75°F [24°C] cure only; no postcure)

Test Temperature Average

75°F (24°C) 2200 psi

250°F (121°C) 290 psi

300°F (149°C) 200 psi

350°F (177°C) 190 psi

Compressive Modulus at 75°F (24°C) 62,000 psi

Shore D Hardness at 75°F (24°C) 55 psi

Scotch-Weld EC-3524 B/A Compound RDA

Rheometrics RDA II - Rectangular Torsion

Frequency 1 rad/second

Sample = 1/8 in. x 1/2 in. x 2 in.

Cured for 1 hour @ 250°F (121°C)