Sikalastic®-320 NS

1 year in original, unopened packaging under proper storage conditions.

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

Specific Gravity: 1.19

Consult Sika Canada

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

Curing and Recoating

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

* See Limitations

Application on Green Concrete

Horizontal: 48 hours or walkable conditions
Vertical: 24 hours after form removal

1.26 m²/L - 50 ft²/US gal. at 30 ± mil d.f.t.
0.62 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.
0.37 m²/L - 15 ft²/US gal. at 120 ± mil d.f.t.

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.

Before application, Sikalastic®-320 NS should be thoroughly mixed at slow speed for 1 min 30 sec. (minimum) using a mechanical mixer fitted with a Jiffy style paddle to achieve an homogeneous consistency. Ensure not to allow entrapment of air into the material. Do not mix in an up and down motion, the paddle must remain constantly immersed in the product during mixing.

Using Optional Water Catalyst: Before application, mix Sikalastic®-320 NS at low speed using a mechanical mixer fitted with a Jiffy style mixing paddle. At a ratio 1 part of water to no less than 40 parts Sikalastic®-320 NS. For a 18.9 L (5 US gal.) pail, add 470 mL (16 US fl. oz) of water (less water may be used to extend working time). Avoid air entrapment into the mixture during mixing. Do not mix in an up and down motion, the paddle must remain constantly immersed in the product during mixing. Once water is mixed with Sikalastic®-320 NS apply within 20 minutes.

Sikalastic®-320 NS may be applied with a brush, squeegee, trowel, or roller. Apply up to 90 mil vertically and 120 mil horizontally per coat. Mix Sikalastic®-320 NS with water to greatly reduce the chance of pinhole formation from concrete out-gassing and improve cure rate.

Flood Test: After Sikalastic®-320 NS has cured, plug drains and provide proper means to contain flood water. Flood deck with a 50 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 in within three (3) days of application, cover Sikalastic®-320 NS 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 water test, visual inspection and/or repairs, cover all horizontal membranes with an approved drainage mat and optional protection board. Sikalastic®-320 NS should not be exposed to sunlight or UV radiation for more than 14 days. For all vertical membranes, cover immediately after cure with a protection course.

Joints, Cracks and Flashing: For all cracks up to 1.5 mm (1/16 in) in width, apply a 100 mm (4 in) wide, 30 mil thick stripe coat of Sikalastic®-320 NS centered over the crack. All cracks exceeding 1.5 mm (1/16 in) in width must be routed to at least 6 mm x 6 mm (¼ in x ¼ in), sealed with the appropriate Sikaflex® sealant and coated with a 10 mm (4 in) wide, 30 mil stripe coat centered on the sealant. Sika® Flexitape Heavy reinforcing fabric may be required for metal flashing transitions, plywood seams, and expansion joints by embedding reinforcing in 15 mil of membrane then coating with another 15 mil of membrane.

Reinforcement: Sika® Fleece-120 non-woven needle punched polyester fleece reinforcing fabric may be desired for some applications to enhance strength and durability of membrane. Embed Sika® Fleece-120 into a 60 mil coat of Sikalastic®-320 NS with a 13 mm (½ in) to 20 mm (¾ in) nap roller. Allow membrane to cure. Then apply another 60 mil coat of Sikalastic®-320 NS on top of the existing coat. Overlap Sika® Fleece-120 75 mm (3 in) along the sides and 150 mm (6 in) at the roll ends.

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