Product Data Sheet
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Sika® Duoflex SL

Two-Component, Self Leveling, Polysulfide Sealant

Sika® Duoflex SL is a two-component, self-leveling, premium quality polysulfide sealant ideally suited for quick application to horizontal surfaces. Sika® Duoflex SL meets ASTM C920, Type M, Grade SL, Class 25, Use I, NT, M, G, A and O. 

  • 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. Check Sika's Chemical Resistance Chart for the use of Sika® Duoflex SL in a particular chemical environment.
  • Effective under constant immersion or saturated conditions, when suitably primed with Sika® Duoflex Primer-5050.
Product Data Sheet
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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

  • 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. Check Sika's Chemical Resistance Chart for the use of Sika® Duoflex SL in a particular chemical environment.
  • Effective under constant immersion or saturated conditions, when suitably primed with Sika® Duoflex Primer-5050.

Packaging

1.5 gallon (5.7 liter) unit with both Components 'A' and 'B' contained in a pail;
60 units per pallet

Color

Bronze

Product Details

Product Information

Shelf Life

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

Storage Conditions

Store dry between 40 and 95 °F (4 and 35 °C).
Condition material to 40 to 100 °F before application. Preconditioning units to approximately 70 °F (21 °C) is necessary when working at the far ends of the application range.
Technical Information

Shore A Hardness

25–30

(73 °F (23 °C) 50 % R.H.) (ASTM D-2240)

Abrasion Resistance

Excellent

Tensile Strength

150–200 psi (1.03–1.38 MPa)

(73 °F (23 °C) 50 % R.H.) (ASTM D-412)

Movement Capability

± 25 %

(73 °F (23 °C) 50 % R.H.)

Service Temperature

-40 to 170 °F (-40 to 77 °C)

Chemical Resistance

Please refer to the "Chemical Resistance Chart for Sika Duoflex NS / SL."

UV Exposure

Very good

Color

Very good

Application

Application Information

Ambient Air Temperature

40 to 100 °F (4 to 38 °C). Sealant should be installed when joint is at mid-range of its anticipated movement.

Substrate Temperature

40 to 100 °F (4 to 38 °C). Sealant should be installed when joint is at mid-range of its anticipated movement.

Pot Life

1 hour

(73 °F (23 °C) 50 % R.H.)

Cure Time

7 days

(73 °F (23 °C) 50 % R.H.)

Tack Free Time

6 hours

(73 °F (23 °C) 50 % R.H.)
Consumption

Coverage

 1 gallon: Yield in Linear feet

Width/Depth1/4''3/8''

1/2''

1/4''307.9
3/8''205.3136.8
1/2''153.9102.677.0
3/4''102.668.451.3
1''38.5
1.25''30.8
1.5''25.7
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 (e.g. sandblasting, abrasive grinding, etd.). 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 1/4” (6 mm) minimum and 1/2” (13 mm) 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. Consult your Sika Technical Service Representative if unsure if primer is necessary. A uniform glossy sheen after priming indicates adequate primer. Some surfaces, such as porous concrete, may require two coats. Primer must be tack-free before applying sealant, typically 2 hrs on concrete and 4 hrs on steel at 77 °F (25 °C). 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) and Sika mixing paddle. Mix for 3–5 minutes to achieve uniform color and consistency. Scrape down sides of pail periodically. Avoid entrapment of air during mixing.

  

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.

   

When mixed in cold weather (<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 teh 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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