Chemical Resistant Sealants - 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 C-920, 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 without adhesive or cohesive failure, based on good joint design.
• Stays resilient within a wide temperature range.
• Excellent resistance to water, oils, grease, most solvents, mild acids and alkalis.
• Tenacious adhesion to concrete, metal, wood, glass, stone, ceramic and masonry surfaces in any combination, typically without the need for priming.
• Effective under constant immersion or saturated conditions, when suitably primed.

Usage

Sika® Duoflex SL is suitable for either exterior or interior use in both static and dynamic joints:

• Expansion and control joints in concrete floors.
• Joints in podium deck structures.
• Expansion joints in tile and brick flooring.
• Joints in gas stations / refueling environments
• Resistant to chlorinated water up to 100ppm

Advantages

• Tough, elastic, rubber-like seal.
• Remains flexible with expansion and contraction of building component without adhesive or cohesive failure, based on good joint design.
• Stays resilient within a wide temperature range.
• Excellent resistance to water, oils, grease, most solvents, mild acids and alkalis.
• Tenacious adhesion to concrete, metal, wood, glass, stone, ceramic and masonry surfaces in any combination, typically without the need for priming.
• Effective under constant immersion or saturated conditions, when suitably primed.

Packaging

1.5 gallon (5.7 liter) unit

Color

Bronze

Product Details

Product Information

Shelf Life

1 year in original, unopened 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

Abrasion Resistance

Excellent

Resistance to Static Puncture

Excellent

Chemical Resistance

(see Sika Duoflex chemical resistance chart)

UV Exposure

Very good

Colour Stability

Very good

Service Temperature

-40 to 170 °F (-40 to 77 °C)

Application

Application Information

Ambient Air Temperature

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

Substrate Temperature

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

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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