
Sikalastic®-320 SL
Sikalastic®-320 SL is a single-component, liquid-applied, self-levelling, bitumen-modified, coal tar-free, moisture-cured polyurethane waterproofing membrane. Sikalastic®-320 SL is also available in non-sag (NS) grade for vertical applications and sprayable grade (SG). Refer to individual product data sheets for specific information.
- Designed for horizontal applications
- Easy application
- Applies on green and damp concrete
- Alkali resistant
- Quick re-coat time
- Ability to catalyze with water
- Faster cure rate
- Solvent-free
- Meets the requirements of ASTM C836
Usage
- Foundation walls
- Plazas and pavers
- Between slabs
- Planters
- Bridges and tunnels
Advantages
- Designed for horizontal applications
- Easy application
- Applies on green and damp concrete
- Alkali resistant
- Quick re-coat time
- Ability to catalyze with water
- Faster cure rate
- Solvent-free
- Meets the requirements of ASTM C836
Packaging
18.9 L (5 US gal.) pail - 208 L drum (55 US gal.), net fill 189 L (50 US gal.)
Colour
Black
Product Details
Shelf Life
12 months in original, unopened packaging under proper storage conditions.
Storage Conditions
Store dry (indoors) at temperatures between +15 °C and +35 °C (60 °F and 95 °F).
Density
1.19
Solid content by weight
99 % ± 2 | (ASTM D236) |
Solid content by volume
95 % ± 2 | (ASTM D2697) |
Volatile organic compound (VOC) content
45 g/L | (ASTM D2369-81) |
Viscosity
30 ± 10 | (Poise at 27 °C (80 °F)) |
Shore D Hardness
80 ± 5 | (ASTM D2240) |
Tensile Strength
70 pli ± 15 | (ASTM D412) |
Tear Strength
80 psi ± 15 | (ASTM D624) Die C |
Service Temperature
-31.7 °C to +93.3 °C (25 °F to 200 °F)
Application
Waiting Time / Overcoating
Application on Green Concrete
Horizontal: 48 hours or walkable conditions
Vertical: 24 hours after form removal
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 SL 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
Yield
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.
SUBSTRATE PREPARATION
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.
MIXING
Before application, Sikalastic®-320 SL 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 SL 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 SL. 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 SL apply within 20 minutes.
APPLICATION
Sikalastic®-320 SL 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 SL with water to greatly reduce the chance of pinhole formation from concrete out-gassing and improve cure rate.
Flood Test: After Sikalastic®-320 SL 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 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 water test, visual inspection and/or repairs, cover all horizontal membranes with an approved drainage mat and optional protection board. Sikalastic®-320 SL 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 SL 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 SL 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 SL 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.
CLEAN UP
Equipment should be immediately cleaned with an environmentally safe solvent, as permitted under local regulations.