Sika Sikasil 728 NS Limestone 29oz 416944

Sikasil 728 NS is a high performance, non-sag. one-component , ultra low modulus elastomeric, neutral cure silicone sealant. Excellent flexibility for dynamic joint movement and extreme temperature conditions.

Ideal for highway and bridge applications
Excellent flexibility
Resistant to road salt and jet fuel

$48.06

Availability: In stock ( 55 Available )

SKU

17874

Sika Sikasil-728 NS Limestone – Neutral Cure Silicone Sealant

Sika Sikasil-728 NS is a one-component, non-sag, ultra-low modulus silicone sealant designed for high-movement concrete joints in roads, bridges, stadiums, and parking structures. This neutral cure formula bonds to a wide range of substrates—concrete, steel, glass, and masonry—without the need for primers in many applications. It performs well in cold climates, resists jet fuel and road salts, and stays flexible in extreme temperatures. With a movement capability of +100% / -50%, it's a reliable choice for critical expansion and saw cut joints.

Key Features:

Ultra-low modulus with +100% / -50% movement capability
Non-sag and suitable for vertical and horizontal applications
Performs in extreme temperatures from -80°F to 350°F
Neutral cure silicone with excellent weather and UV resistance
Bonds to concrete, metal, stone, and more—often without primer
Resists jet fuel and deicing salts
Ideal for expansion joints, driveways, plaza decks, and parking decks

Technical Specifications:

Property	Value
Movement Capability	+100% / -50% (ASTM C-719)
Tensile Strength	175 psi (ASTM D-412)
Elongation at Break	~1000% (ASTM D-412)
Adhesion (Peel Strength)	~7 N/mm (40 lbf/in) on mortar (ASTM C-794)
Service Temperature	-80°F to 350°F (-62°C to 177°C)
VOC Content	21 g/L (0.18 lb/gal)
Shore A Hardness	5–10 (after 7 days)
Tack-Free Time	30–40 minutes (ASTM C-679)
Cure Rate	1/16” in 24 hours

Frequently Asked Questions:

Can Sikasil-728 NS be used on vertical joints?
Yes, its non-sag formula makes it effective for both vertical and horizontal applications.

Does this sealant need a primer?
Not usually. It adheres well without one, though primer is recommended for horizontal joints to ensure best performance.

Is this product resistant to deicing salts?
Yes, Sikasil-728 NS is formulated to resist damage from road salts and chemicals.

Can it be applied in cold weather?
Yes, it’s suitable for installation even in freezing conditions—just make sure surfaces are clean and dry.

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