Roadway Sealants - Sikasil®-728 SL
Self-leveling, ultra low-modulus, highway/parking garage, neutral cure silicone sealant
Sikasil®-728 SL is a self-leveling, one-component, ultra low modulus, elastomeric, neutral cure silicone sealant. Meets the requirements of ASTM D-5893; ASTM C-920, Type S, Grade P, Class 100/50; Use T, M, G, A, O with an ultra low Shore Hardness; TT-S-00230C, Type I, Class A; TT-S-001543A, Class A.
- No tooling, less labor
- Durable
- Ideal for cold climates
- Excellent flexibility for extreme high and low temperature conditions
- Excellent flexibility for dynamic joint movement
- Bonds to most substrates without priming including aged asphalt and concrete
- Ready to use
- All season ease of application
- Good contact/adhesion with hard to reach areas
- Excellent for use on runways and tarmacs
- Jet fuel resistant
- Resistant to road salts
Usage
Construction Application - Highway joints
- Bridges
- Stadiums
- Parking garages
- Plaza decks
- Driveways
- Decks
- Expansion joints
- Saw cut joints
Substrate - Concrete, steel, glass, aluminum, tile, ceramic, masonry, asphalt, brick, stone and granite
Advantages
- No tooling, less labor
- Durable
- Ideal for cold climates
- Excellent flexibility for extreme high and low temperature conditions
- Excellent flexibility for dynamic joint movement
- Bonds to most substrates without priming including aged asphalt and concrete
- Ready to use
- All season ease of application
- Good contact/adhesion with hard to reach areas
- Excellent for use on runways and tarmacs
- Jet fuel resistant
- Resistant to road salts
Packaging
4.5 gal (17 L) in a 5 gal pail
52 gal (197 L) in 55 gal drum
29 oz. cartridges/12 per case.
Color
Limestone and Charcoal Gray.
Product Details
Product Information
Chemical BaseNeutral cure silicone
Shelf Life12 months in original unopened container. A product skin may form in pails and drums, remove prior to use.
Storage ConditionsStore in unopened containers at temperatures at or below 90 °F (32 °C).
Volatile organic compound (VOC) content2.27 % by wt., 29 g/L, 0.24 lb./gal.
Technical Information
Service Temperature-80 °F min. / +350 °F max. (-60 °C min. / 175 °C max.)
Application
Application Steps
SUBSTRATE PREPARATIONJoint Design: The number of joints and the joint width should be designed for a recommended joint movement of +25 % and -25 % at time of installation. The depth of the sealant should be 1/2 the width of the joint. The maximum depth is 1/2 inch (13 mm) and the minimum is 3/8 inch (10 mm). For joints greater than 1 inch (25.4 mm), do not exceed 1/2 inch (13 mm) in depth.
Joint Backing: To control joint depth, use closed cell polyethylene or non-gassing polyolefin backer rod. If joint depth does not allow for backer rod, use polyethylene bond breaker tape to prevent three-sided adhesion. Closed cell backer rod should be 25 % larger than joint width; do not compress more than 40 %.
The substrate must be clean, dry, frost free, sound and free of any oils, greases or incompatible sealers, paints or coatings that may interfere with adhesion.
Porous Substrates - clean by mechanical methods to expose a sound surface free of contamination and laitance.
Non-porous substrates - for cleaning non-porous substrates, use two rag wipe method using xylene or an approved commercial solvent. Allow solvent to evaporate prior to sealant application.
Sikasil®-728 SL is designed to obtain adhesion without the use of a primer; however, best results are obtained when horizontal joints are primed. Test by applying the sealant and/or primer sealant combination to confirm results and proposed application methods. Refer to Technical Data Sheet for Sikasil Primer and contact Technical Service for additional information.
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