Adhesive Attachment of 
STONEWEAR GFRC Products

ADHESIVE OF CHOICE
Sikaflex-221 Elastic Adhesive/Sealant (Call Steve Padgett @ 888-832-7452 or order directly from STONEWEAR).
Alternate: Any electrometric adhesive rated for outdoor use.

PLACEMENT
There is about 200 lbs. of holding power per square inch for surfaces joined with a film of Sikaflex. A 1/4" dab when squashed equals about 1 sq. inch. If it is anticipated that the part will ever need to be moved it is advisable to place 3/8" dabs of adhesive near the perimeter of part only so it can be cut with a thin blade if required. There is approximately 30 L. F. of 1/4" bead; 15 L. F. of 3/8" bead in a cartridge. There are approximately 400 3/8" dabs per cartridge.

HOW TO USE:
Substrate:
Clean free of oil and grease, and of sound quality, thoroughly remove all loose particles. Dust is the enemy. Just before application, clean with damp rag, changing surfaces of rag to ensure clean pickup.

In applications requiring a water tight seal it is necessary to ensure that the Sikaflex is held in compression while it cures. This can be done with clamps, fasteners, or some kind of special fixtures depending on specific application (contact STONEWEAR for recommendation if required).

PRIMING:
Sika-Primer (contact Sika for product information) will improve adhesion to oily wood, PVC, ABS, polycarbonates and acrylic plastics, as well as improve adhesion to oily metals, stainless or galvanized steel. Since substrate type and uniformity can vary, a pre-test is recommended. For the ultimate in water tight joints rub small amount of the Sikaflex adhesive over entire area to be sealed with finger pressure prior to applying bead for primary joint.

APPLICATION:
Recommended application temperatures: 40 F and above. For cold-weather application, store units at approximately 70 F; remove just prior to using. Make sure joint is frost-free. Push tip of plastic nozzle into extrusion end of cartridge to puncture airtight seal. Affix nozzle to cartridge, cut tip to joint size. Install with hand- or power-operated caulking gear. To facilitate tooling, wet pointing tool or finger with soap solution.

CLEANING UP:
Mineral Spirits will remove uncured adhesive. Once cured, the material can only be removed mechanically.

STORAGE:
Sikaflex 221 should not be stored at temperatures in excess of 75 F. Properly stored in cool, dry conditions the unopened cartridges have a shelf life of twelve (12) months from date of manufacture.

Sikaflex-221 Elastic Adhesive/Sealant

DESCRIPTION:
Sikaflex-221 is a 1-component, fast curing, polyurethane-based adhesive/sealant. It is a moisture-cured, non-sag system. Sikaflex-221 provides a permanent elastic bond to fasten materials which have dissimilar coefficients of expansion. Packaged in 10.3-fl-oz cartridges, 10.3-fl-oz uni-pacs, 5 gal pails or 50 gal drums.

PROPERTIES:

ADVANTAGES:

• Cures rapidly to a permanently elastic consistency with excellent cut-and tear-resistance.
• Provides shock-resistance and vibration dampening.
• Adheres to a wide range of substrates, without primer in many cases.
• Can be over-painted with water, oil, and rubber-based coatings. Since some paints dry slowly and the surface may remain slightly tacky, a preliminary test is essential.
• Odorless, non-staining.
• Exhibits tenacious adhesion to aluminum, FRP, steel, wood, prepainted metals, oily GALVALUME, ZINCALUME, Zincgrip, and aluminized steel, without attacking the metal coating.
• Excellent weather resistance and exhibits high recovery, making it ideal for sealing dynamically moving joints.
• Packaged in 10 oz. cartridge.

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