Urethane Adhesives

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Application and

Equipment Suggestions

These products may be applied with spatula, trowel, or flow equipment. Appropriate

two-part metering and mixing equipment is also commercially available.

Directions for Use

1. Surfaces to be bonded must be dry and free from rust, oil, grease and wax.

2. Primer Information:

3M™ Scotch-Weld™ Structural Adhesive Primer EC-3901 may be applied

by spray or brush. Air dry cycles for periods as short as 1/2 hour have been used

successfully with the force dry cycle. Humidity contributes greatly to satisfactory

use of this primer. Relative humidity of 25% or lower may cause difficulties and

should be thoroughly evaluated in the customers’ application.

The primed surface, after cooling to ambient temperatures, is ready for adhesive

bonding. The primed surface should be protected from contamination introduced

by dust, fingerprints, oil, etc.

See Data Sheet for Scotch-Weld Structural Adhesive Primer EC-3901 for

directions for use.

*Note: When using solvents, extinguish all ignition sources and follow the

manufacturer’s precautions and directions for use when handling such

materials.

3M™ Scotch-Weld™

Urethane Adhesive 3549 B/A

Base

Accelerator

Color (Cured: Brown)

Off-White

Brown

Base

Polyol

Isocyanate

Net Weight (lbs./gal.)

10.3

11.2

Viscosity

Brookfield RVF #6 sp.

Brookfield RVF #5 sp.

cps @ 75°F (24°C)

@ 10 rpm: 10,000-40,000 cps

@ 10 rpm: 15,000-40,000 cps

Mix Ratio: By Weight

100

109

By Volume

100

100

Work Life: 100 grams mixed at 75°F (24°C): 45-70 min.

Time to Reach Full Cure @ 75°F (24°C) 7 days.

Typical Physical

Properties (continued)

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

or typical only and should not be used for specification purposes.