Sikalastic®-320 SG

12 months in original, unopened packaging under proper storage conditions

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

See Product Safety Data Sheet

-31.7 °C to +93.3 °C (25 °F to 200 °F)

Application on Green Concrete

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

1.15 m²/L (47 ft²/US gal) results in 30 ± mils DFT
0.56 m²/L (23 ft²/US gal) results in 60 ± mils DFT (standard)
0.36 m²/L (15 ft²/US gal) results in 90 ± mils DFT
0.27 m²/L (11 ft²/US gal) results in 120 ± mils DFT

Surfaces may be dry or damp, but must be sound and free of standing water, dust, laitance, grease, curing compounds, impregnations, waxes and any other contaminants. Scratch and remove sheen for metal surfaces before applying primer. Scratch marine grade and high density plywood with sandpaper before applying primer.

Before application, Sikalastic®-320 SG should be thoroughly mixed using a mechanical mixer and jiffy style paddle at slow speed for 2 minutes minimum 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.

Using Optional Water Catalyst (only for non-spray applications): Before application, mix Sikalastic®-320 SG 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 SG. For a 18.9 L (5 US ga)l 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 SG apply within 20 minutes. Do not mix Sikalastic®-320 SG with water when using an airless sprayer.

Sikalastic®-320 SG may be applied with an airless sprayer. Apply up to 90 mils vertically and 120 mils horizontally per coat. Cured membrane must be pinhole-free after application to validate warranty. (Contact Sika Technical Services for Plaza Deck applications where vegetation is planned.)

Priming: Some warranties and/or substrates may require the use of a primer. Consult Sika for prior approval for all warranties, primer and various substrate review. 

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.

Joints, Cracks and Flashing: For all cracks up to 1.6 mm (1/16 in) width, apply a 101 mm (4 in) wide, 30 mil stripe coat of Sikalastic®-320 SG centered over the crack. All cracks over 1.6 mm (1/16 in) width must be routed to at least 6 mm (1/4 in) by 6 mm (1/4 in) sealed with the appropriate Sikaflex® sealant, and coated with a 101 mm (4 in) wide, 30 mil stripe coat centered on the sealant. When sealing green concrete, use Sikaflex®-1a. Sealant may be overcoated when tack-free. Sika Flexitape Heavy reinforcing fabric may be required for metal flashing transitions, plywood seams, and expansion joints by embedding reinforcing in 15 mils of membrane then coating with another 15 mils of membrane.

Curing and Recoating: At 24 °C (75 °F) and 50 % relative humidity, allow each coat of Sikalastic®-320 SG to cure 16–24 hours minimum. If more than 48 hours pass between coats the surface must be solvent wiped and primed with Sikalastic® Recoat Primer.

Spray Equipment: Use Sikalastic®-320 SG with a Graco GH 833 Big Rig or Titan Hydra Pro IV airless pump. Use a 38 mm (1.5 in) Solvent-Resistant Siphon Kit, 13 mm (1/2 in) High Pressure Hose (4000 psi), 6 mm (1/4 in) x 76 mm (3 in) High Pressure Whip 27.6 MPa (4000 psi), Graco 535 Spray Tip, 38 cm (15 in) Tip Extension Wand, and a Graco Flex Plus Gun. Contact Sika Technical Services for more information.

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

Flood Test: After Sikalastic®-320 SG has cured, 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 SG with a protection course to prevent damage from other trade work until a successful flood test is completed.

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