Product Data Sheet Safety Data Sheet Show all documents

Sika® Duoflex SL

Self-levelling, polysulfide sealant

Sika® Duoflex SL is a two-component, self-levelling, premium quality, polysulfide sealant ideally suited for quick application to horizontal surfaces.

  • Provides a tough, elastic, rubber-like seal
  • Remains flexible with expansion and contraction of building component (based on good joint design)
  • Stays resilient within a wide temperature range
  • Excellent resistance to water, oils, grease, most solvents, mild acids and alkalis
  • Effective under constant immersion or saturated conditions, when suitably primed with Sika® Duoflex Primer-5050
Product Data Sheet Safety Data Sheet Show all documents

Usage

Sika® Duoflex SL may only be used by experienced professionals.    Sika® Duoflex SL is suitable for either exterior or interior use in both static and dynamic joints.
  • Concrete and precast concrete joints in bridges, roadways, and warehouse floors
  • Expansion and control joints in concrete floors
  • Expansion joints in tile and brick flooring
  • Joints in podium deck structures
  • Joints within secondary containment areas
  • Joints located in gas station and refueling environments
 

Advantages

  • Provides a tough, elastic, rubber-like seal
  • Remains flexible with expansion and contraction of building component (based on good joint design)
  • Stays resilient within a wide temperature range
  • Excellent resistance to water, oils, grease, most solvents, mild acids and alkalis
  • Effective under constant immersion or saturated conditions, when suitably primed with Sika® Duoflex Primer-5050

Packaging

5.7 L (1.5 US gal) unit with both Components "A" and "B" contained in a pail; 60 units per pallet

Colour

Bronze

Product Details

Sustainability / Certifications / Approvals

APPROVALS / CERTIFICATES

  • Meets ASTM C920, Type M, Grade SL, Class 25, Use I, NT, M, G, A and O
Product Information

Shelf Life

12 months from date of production if stored properly in original, unopened and undamaged, sealed packaging

Storage Conditions

Store dry at temperatures between 4 °C and 35 °C (40 °F and 95 °F).
Technical Information

Shore A Hardness

25 – 30

(ASTM D2240)

Abrasion Resistance

Excellent

Tensile Strength

1.03 – 1.38 MPa (150 – 200 psi)

(ASTM D412)

Movement Capability

± 25 %

Chemical Resistance

Refer to the "Chemical Resistance Chart for Sika® Duoflex NS / SL"

Resistance to UV Exposure

Very good

Service Temperature

-40 °C to +77 °C (-40 °F to +170 °F)

Colour Stability

Very good

Application

Application Information

Product Temperature

Condition material to temperatures between 4 °C and 38 °C (40 °F and 100 °F) before application. Preconditioning units to approximately 21 °C (70 °F) is necessary when working at the far ends of the application range. Move pre-conditioned units to work areas just prior to application.

Ambient Air Temperature

4 °C to 38 °C (40 °F to 100 °F)

Substrate Temperature

4 °C to 38 °C (40 °F to 100 °F)

Pot Life

1 hour

Curing Time

7 days

Tack-free time

6 hours

Consumption

Yield

 Linear metre per litre (Linear feet per liter)

Width/Depth6 mm (1/4 in)10 mm (3/8 in)

13 mm (1/2 in)

6 mm (1/4 in)24.7 (81.1)
10 mm (3/8 in)16.5 (54.2)11 (35.9)
13 mm (1/2 in)12.3 (40.4)8.2 (27.0)6.2 (20.3)
19 mm (3/4 in)8.2 (27.0)5.5 (18.0)4.1 (13.5)
25 mm (1 in)3.1 (10.0)
32 mm (1 1/4 in)2.5 (7.9)
38 mm (1 1/2 in)2.1 (6.6)
Application steps

SUBSTRATE PREPARATION

All joint surfaces must be clean, sound, dry and frost-free. Joint walls must be free of oils, grease, paints, coatings, sealers, curing compound residues, and any other foreign matter that might prevent adhesion. This should be accomplished by mechanical means, such as sandblasting, abrasive grinding, etc. Bond breaker tape or backer rod must be used in bottom of joint to prevent bond.

  

Joint Design
Proper joint design for moving joints is 2:1 width to depth ratio, with a recommended 6 mm (1/4 in) minimum and 13 mm (1/2 in) maximum depth of sealant. For non-moving joints, the width to depth ratio can vary.

   

Priming
For maximum adhesion, including in submerged or immersed applications, the use of Sika® Duoflex Primer-5050 is necessary. Contact Sika Canada Technical Service if unsure if primer is necessary. A uniform glossy sheen after priming indicates adequate primer. Some surfaces, such as porous concrete, may require two (2) coats. Primer must be tack-free before applying sealant, typically two (2) hours on concrete and four (4) hours on steel at 25 °C (77 °F). Sealant must be applied same day as primer. Primed areas left overnight should be re-primed.

MIXING

Pour entire contents of Component B into pail of Component A and mix using a low speed drill (100–300 rpm) fitted with a mixing paddle. Mix for at least for five (5) minutes to achieve uniform colour and consistency. Scrape down sides of pail periodically. Avoid entrapment of air during mixing.

   

Remark: Mixed material must be used within the pot life parameters given. Do not attempt to thin or use material that has started to harden. The individual components are formulated, manufactured and shipped to be used together.

 

Cold Weather Mixing: When mixing material at temperatures < 5 °C (< 50 °F), do not force the mixing paddle to the bottom of the pail. After adding Component B in Component A, mix the top 1/2 to 3/4 of the pail in the first minute of mixing. After scraping down the sides of the pail, mix again for another minute. The paddle should reach the bottom of the pail between the first and second minute of mixing. Scrap down the sides of the pail a second time and then mix for an additional 2–3 minutes until sealant is well blended.

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