Sikalastic®-320 SL

12 months in original, unopened packaging under proper storage conditions

Store dry (indoors) at temperatures between 15 and 35 °C (60 and 95 °F)

See Product Safety Data Sheet

-31.7 to +93.3 °C (25 to 200 °F)

Application on Green Concrete

Horizontal: 48 hours or walkable conditions
Vertical: 24 hours after forms removed

• 1.22 m²/L - 50 ft²/US gal. at 30 ± mil d.f.t.
• 0.61 m²/L - 25 ft²/US gal. at 60 ± mil d.f.t. (standard)
• 0.44 m²/L - 18 ft²/US gal. at 90 ± mil d.f.t.
• 0.31 m²/L - 13 ft²/US gal. at 120 ± mil d.f.t.

Surface must be clean, dry and sound with an open texture. Remove dust, laitance, grease, curing compounds, bond inhibiting impregnations, waxes, and any other contaminants. All projections, rough spots, etc. should be dressed off to achieve a level surface prior to application.

Concrete: New concrete must be cured a minimum of 28 days prior to application. Old concrete must be free of loose aggregate, dirt and be dry. New and old concrete should be Shot-, Water- or Abrasive-blasted. Grease spots and oil should be chemically cleaned with appropriate cleaners or mechanically removed.

Plywood: The only acceptable grade of plywood is APA rated exterior grade or better. The appearance and physical characteristics of the plywood and grade should be considered. Plywood should be new or cleaned and sanded.

Metal: Metal must be in sound condition. The surface should be free of all visible oil, grease, dust, dirt, mill scale, rust, coating, oxides, corrosion products and other foreign matter. Be aware of dew point and check it before every application on metal surface.

• Ferrous Metals: Must be prepared to SSPC-SP6/NACE 3. For areas where SSPC-SP6/NACE 3 is prohibited or not feasible, substrate can be thoroughly cleaned by grinding or other power tools per SSPC-SP11

• Non-Ferrous Metals: Prepare to a bright metal surface. Wire brushing can be used for soft metal such as copper or lead

• Galvanized Steel: White rust must be removed from galvanized steel, with care taken not to damage or remove the galvanizing

• Stainless Steel: Must be mechanically abraded or ground to create an appropriate anchor profile

PRIMING

Some warranties and/or substrates may require the use of a primer. Consult Sika for prior approval for all warranties.

For applications with primer over concrete, the primer used will depend on the moisture level of the concrete. Measure the moisture content of concrete substrate with a Tramex CME or CMExpert type concrete moisture meter.

Do not prime over an existing crack and joint detail coats.

PRIMER SELECTION

Sika® MT Primer: For concrete with a maximum moisture content of 5 % by weight, apply a single coat application of Sikalastic® MT Primer with a flat squeegee or roller at approximately 4.3 m²/L (175 ft²/US gal). For concrete decks with a maximum moisture content of 6 % by weight, apply two applications of Sika® MT Primer with a flat squeegee or phenolic resin roller at approximately 4.3 m²/L (175 ft²/US gal) per application. Work primer well into the substrate to ensure adequate penetration and sealing. Apply evenly without puddling. Refer to a separate primer data sheet for additional information.

NOTE: For rough or porous concrete or when outgassing is a concern, use Sika® MT Primer. See inidividual Product Data Sheet for more information. This rate may vary on the porosity of the substrate. The surface must be totally covered with primer with no dry spots or spots where the primer has completely absorbed into the substrate, multiple coats may be required. Allow primer to become tack free before proceeding to the next phase.

Sikalastic®-320 SL should be thoroughly mixed using a mechanical mixer and jiffy style paddle at slow speed for a minimum of 2 minutes to ensure a homogeneous material. Take care not to allow entrapment of air into the material. Do not mix in an up and down motion.

Optional Water Catalyst: Mix Sikalastic®-320 SL using a mechanical mixer and jiffy style mixing paddle at a slow speed. At a ratio 1 part of water to no less than 40 parts Sikalastic®-320 SL. For a 18.9 L (5 US gal) pail, add 473 mL (16 oz) of water (less water may be used to extend working time). Use care not to allow the entrapment of air into the mixture. Do not mix in an up and down motion. Once water is mixed with Sikalastic®-320 SL apply within 20 minutes.

DETAILING:

For moving and non-moving cracks less than 1.6 mm (1/16 in) width: Apply a 30 mil detail coat of Sikalastic®-320 SL, extending 51 mm (2 in) on either side and centered over the crack.

For cracks 1.6 mm (1/16 in) width or greater and less than 25.4 mm (1 in) width: Must be routed to at least 6 mm (1/4 in) by 6 mm (1/4 in), and sealed with an appropriate Sikaflex® sealant, installed per sealant Product Data Sheet, and coated with a 30 mil detail coat of Sikalastic®-320 SL, extending 51 mm (2 in) on either side and centered over the crack. Non-moving cracks can be filled with compatabile rigid repair materials.

NOTE: Cracks may indicate a structural issue and should be addressed by a structural engineer or appropriate design professional.

For joints 1.6 mm (1/16 in) or greater and less than 38 mm (1.5 in) width: Joints should be sealed with the appropriate Sikaflex® sealant, installed per sealant Product Data Sheet, and coated with a 30 mil detail coat of Sikalastic®-320 SL, extending 51 mm (2 in) on either side and centered over the crack.

For expansion joints 38 mm (1.5 in) or greater width: Should be treated as expansion joints and brought up through the Sikalastic®-320 SL membrane and/or Emseal Expansion Joint System, Sikadur Combiflex SG or other appropriate joint sealing system should be used. Contact Sika Technical Services for recommendations prior to application.

Fabric reinforcement: Sika does not require reinforcing of the detail coat when going over cracks and joints. In situations where reinforcing detail coats is required, use a 76 mm (3 in) wide strip of Sika Flexitape Heavy as the reinforcing. Please see the Sika Flexitape Heavy product data sheet for installation instructions.

APPLICATION:

Sikalastic®-320 SL may be applied with a brush, squeegee, trowel, or roller. Apply up to 120 mils horizontally per coat. Mix Sikalastic®-320 SL with water to greatly reduce the chance of pinhole formation from concrete out-gassing and improve cure rate. Cured membrane must be pinhole free after application to validate warranty. (Contact Sika Technical Services for Plaza Deck applications where vegetation is planned).

CURING AND RECOATING:

At 24 °C (75 °F) and 50 % relative humidity, allow each coat of Sikalastic®-320 SL to cure 16–24 hours minimum. When using water as a catalyst: allow Sikalastic®-320 SL to cure a minimum of 2–4 hours before proceeding to subsequent coats. If more than 48 hours pass between coats the surface must be solvent wiped and primed with Sikalastic® Recoat Primer.

FLOOD TEST:

After Sikalastic®-320 SL has cured (16-24 hours), plug drains, and provide proper means to contain flood water. Flood deck with a 51 mm (2 in) head of water and allow to stand for 24 hours. Check for leaks and immediately make repairs if required. Retest after any repairs have been made. If a flood test cannot be completed within 3 days of application, cover Sikalastic®-320 SL with a protection course to prevent damage from other trade work until a successful flood test is completed.

MEMBRANE PROTECTION:

As soon as possible after completion of a successful flood test, visual inspection and/or repairs, cover membrane with an approved drainage mat or protection board. Sikalastic®-320 SL should not be exposed to sunlight or UV radiation for more than 14 days.

Equipment should be immediately cleaned with an environmentally safe solvent, as permitted under local regulations.