3M™ Scotch-Weld™ Urethane Adhesive DP640 Brown

Technical Information Note

The following technical information and data should be considered representative or typical only and should not be used for speci cation purposes.

Typical Uncured Physical Properties

Property

Values

Notes

Test Condition

Color

Brown

Colors may vary from nearly white to

yellow/amber. Adhesive performance is not

a ected by color variation.

Base Color

Pink/Purple

Accelerator Color

Tan

Base Density

10.0 to 10.5 lb/gal

Accelerator Density

11.1 to 11.5 lb/gal

Base Viscosity

10,000-40,000 cP

Viscosity measured using Brook eld RVF, spindle

#6, 10 RPM

80°F(27°C)

Accelerator Viscosity

15,000-55,000 cP

Viscosity measured using Brook eld RVF, spindle

#6, 10 RPM

80°F(27°C)

Mix Ratio by Volume (B:A)

1:1

Mix Ratio by Weight (B:A)

1:1

Typical Mixed Physical Properties

Property

Values

Test Condition

Method

Substrate

Notes

Worklife, 10g

mixed

40 min

@ Room

Temperature, 10 g,

1/4" thick

Time to Handling

Strength

6 to 8 h

3M C3179

Aluminum

Time to handling strength taken to be that required

to achieve a 50 psi overlap shear (OLS) strength

using aluminum substrates.

Time to Full Cure

7 day

The cure time is de ned as that time required for

the adhesive to achieve a minimum of 80% of the

ultimate strength as measured by aluminum-

aluminum OLS.