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Sika Sikasil 728 NS Limestone 29oz 416944
Sikasil-728 NS is a one-component non-sag ultra low modulus silicone in a Limestone 29 oz cartridge for highway and parking-garage joints. It skins in 15 to 25 minutes and holds +100% / -50% movement on vertical and overhead joints.
- ASTM C920 Class 100/50 with +100% / -50% movement
- Non-sag ultra low modulus for vertical highway joints
- Skins in 15 to 25 minutes at 77 F
$58.17
Availability:
Out of stock
Sikasil-728 NS
Sikasil-728 NS is a one-component, non-sag, ultra low modulus, neutral-cure silicone for highway, bridge, and parking-garage joints that meets ASTM C920 Type S, Grade NS, Class 100/50 and ASTM D-5893. This Limestone 29 oz cartridge (part 416944) skins in 15 to 25 minutes, is tack-free in 30 to 40 minutes at 77 F, reaches Shore A 5 to 10 with approximately 175 psi tensile and 1,000% elongation, and holds +100% / -50% movement. It resists jet fuel and road salts and bonds most substrates without priming on vertical and overhead joints.
Key Features
- One-component non-sag ultra low modulus neutral-cure silicone
- Meets ASTM C920 Type S, Grade NS, Class 100/50 and ASTM D-5893
- Movement capability +100% extension / -50% compression
- Skin time 15 to 25 minutes; tack-free 30 to 40 minutes at 77 F
- Shore A 5 to 10 with approximately 175 psi tensile and 1,000% elongation
- Resists jet fuel and road salts on concrete highway joints
Applications
- Works on highway joints, bridges, and stadiums
- Parking garages, plaza decks, driveways, and docks
- Expansion joints and saw-cut joints in concrete
- Vertical and overhead joints where non-sag bead control is required
Technical Specifications
| Property | Value |
|---|---|
| Manufacturer | Sika |
| Product | Sikasil-728 NS |
| Part no. | 416944 |
| Unit | 29 oz cartridge |
| Color | Limestone |
| Chemistry | Non-sag neutral-cure silicone |
| Movement | +100% / -50% (ASTM C-719) |
| Shore A | 5 to 10 (7 days) |
| Tensile / elongation | Approximately 175 psi / 1,000% |
| Skin / tack-free | 15 to 25 min / 30 to 40 min at 77 F |
| Service temperature | -80 to 350 F |
Product documents: Sikasil-728 NS Product Data Sheet (PDF)
Frequently Asked Questions
What movement capability does Sikasil-728 NS hold?
+100% extension / -50% compression under ASTM C-719, matching ASTM C-920 Class 100/50.
What skin and tack-free times should crews plan for with Sikasil-728 NS?
Skin time is 15 to 25 minutes and tack-free time is 30 to 40 minutes at 77 F and 50% R.H.
What joints suit Sikasil-728 NS on the structure?
Highway joints, bridges, parking garages, plaza decks, driveways, stadiums, expansion joints, and saw-cut joints, including vertical and overhead work.
What hardness does cured Sikasil-728 NS reach?
Shore A 5 to 10 after 7 days (Shore OO approximately 50), an ultra low modulus for extreme dynamic movement.
What priming does Sikasil-728 NS need on concrete?
It bonds most substrates without priming. Best performance on horizontal joints is obtained when primed; confirm adhesion on atypical surfaces.
What size is the Sikasil-728 NS cartridge on this page?
This page is the Limestone 29 oz cartridge, part 416944.
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