Product Data Sheet Safety Data Sheet Show all documents
Sikasil®-728 SL

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
Product Data Sheet Safety Data Sheet Show all documents

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 Base

Neutral cure silicone

Shelf Life

12 months in original unopened container. A product skin may form in pails and drums, remove prior to use.

Storage Conditions

Store in unopened containers at temperatures at or below 90 °F (32 °C).

Volatile organic compound (VOC) content

2.27 % by wt., 29 g/L, 0.24 lb./gal.
Technical Information

Shore Hardness

3-5

Shore A (after 7 days)

40

Shore OO (after 7 days)

Shore A Hardness

3–5

(after 7 days) (ASTM C-661, ASTM D-2240)

Tensile Strength

100 psi (0.69 MPa)

(ASTM D-412)

Tensile Stress at Specified Elongation

30 psi (0.21 MPa) at 100 % elongation

(ASTM D-412)

Adhesion in Peel

25 pli

(ASTM C-794)

Movement Capability

+100 % / –50 %

(ASTM C-719)

Resistance to Weathering

Excellent

(ASTM C-793)

Service Temperature

-80 °F min. / +350 °F max. (-60 °C min. / 175 °C max.)

Application

Application Information

Skin Time

60 minutes

(77 °F (25 °C), 50 % R.H) (MNA Method)

Tack Free Time

115 minutes

(77 °F (25 °C), 50 % R.H.) (ASTM C-679)
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

29 oz Cartridge: Yield in Linear feet

Width/Depth1/4''3/8''1/2''
1/4''69.8

3/8''

46.531.0
1/2''34.923.317.4
3/4''23.315.511.6
1''8.7
1.25''7.0
1.5''5.8
Application steps

SUBSTRATE PREPARATION

Joint 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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