Magnolia Plastics Magnobond 3

Plastics for the Space Age Since 1957


Magnobond 3, Parts A & B

ADHESIVE FOR CONCRETE
WET OR DRY, NEW OR OLD
MAGNOBOND 3

DESCRIPTION

This two-component epoxy adhesive produces a bonding membrane between existing concrete and a freshly poured concrete overlay. Using this adhesive, concrete can be poured as thin as one inch; without it, a depth of three inches of concrete would be required for adequate strength and apparent adhesion. A true adhesive bond is produced between old and new concrete by using this adhesive. It develops a strength in a controlled manner; paralleling that of the newly poured concrete. This bond, however, develops a final strength which is superior to both the old and the new concrete. Meets or exceeds requirement of ASTM C-881, Type V.

MIXING, APPLICATION AND CURING

Equal volumes of Parts A and B should be combined by vigorously mixing them in a suitable container (paint can, paper cup, etc.) for at least three minutes. Care should be taken to scrape the sides and bottom of the mixing container with the stirring spatula so that no unmixed epoxy or curing agent remains unincorporated. Improperly mixed adhesive will not cure properly and may cause the bond to fail. Preheat to 125°F before spraying.

Surface preparation is of extreme importance. This adhesive will perform best when the concrete is sound and free from dirt, scale, old paint and grease (any oil product). Sandblasting is a universally accepted method of cleaning concrete and should be used whenever possible. Etching of concrete can be done alternately by spreading muriatic (dilute hydrochloric) acid over the surface, then flushing with clean water once the bubbling has stopped. Oil products are best removed by using detergent solutions, always followed by clear water rinses.

Once the epoxy adhesive has been applied to the old concrete, there is no need to wait before pouring freshly mixed concrete over it. In fact, the adhesive MUST be "alive" (still wet) at the time the concrete is poured.

If this system is being sand-filled for use as a surface repair compound, it can be troweled into place using conventional techniques.

This adhesive begins to cure as soon as it is mixed. It is advisable, therefore, to mix no more adhesive than that which can be applied within 20 to 30 minutes. Where concrete is being poured over the wet adhesive, the adhesive will proceed in its cure at such a rate as to always be stronger than the new concrete. When used for surface repairs, allow 16 hours at 77°F (longer at cooler temperatures; shorter at higher temperatures) before placing the area back into service.

PHYSICAL PROPERTIES 
Liquid State (before cure)
Color                             Brown
Specific Gravity                  1.1
Mix Ratio (by volume)
  Compound:                       1
  Curing Agent:                   1
Viscosity                         6,000 cps
Pot Life (3-oz.)                  40 minutes @ 77°F
  (one quart)                     25 minutes @ 77°F
  Semi Cure                       16 hours @ 77°F
  Full Cure                       7 days @ 77°F

Solid State (after cure)
Hardness (Shore)                  85 D
Adhesion to Concrete              Surpasses strength of concrete
Tensile Strength                  4,500 psi
Tensile Elongation                4%
*Chemical Resistance              Water, Salt Spray, Acid Spills,
                                  Alkalis, Paint Solvents, Oil,
                                  and Gasoline
Temperature Resistance            Below Zero to 150°F
SPI Classification                4

*Chemical resistance requires a cure of 1 to 2 weeks at 77°F.

 


            DANGER                            FIRST-AID
--------------------------------     -------------------------
May cause severe irritation.         Eyes - Immediately flush
Do not get in eyes, on skin          eyes with plenty of water
or clothing.                         for at least 15 minutes.
Do not inhale vapors.                Get medical attention.
Wear rubber gloves & aprons.         Skin - Wash immediately
Use with adequate ventilation.       with soap and water.
Wash thoroughly after handling.      Clothing - Remove clothing
For industrial use only.             and wash before reuse.
Keep container closed.
Do not reuse this container.
Spec Sheet Dated: 03/11/93

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Updated: September 26, 1996