S327 is a one-component, non-sag silicone joint sealant specifically engineered for long-term weatherproof sealing of concrete expansion joints in airports, highways, tunnels, bridges and other heavy-duty infrastructure projects.

Featuring low modulus, excellent elastic recovery and outstanding UV and climate resistance, S327 reliably withstands extreme temperatures, strong ultraviolet exposure and repeated joint movement without cracking or loss of adhesion.

Key Features & Benefits

• Excellent Weather Resistance: Outstanding resistance to UV radiation, ozone and extreme climates
• High Movement Capability: Accommodates expansion, contraction and shear movement of concrete joints
• Low Modulus Performance: Reduces stress on concrete substrates, preventing surface damage
• Superior Elastic Recovery: Fast response and recovery with minimal permanent deformation
• Non-Sag Formula: Suitable for horizontal and vertical joint applications
• Long Service Life: Designed for demanding infrastructure environments

Technical Specifications

Property	Value	Standard
Extrusion Rate	≥80 ml/min	GB/T 13477.3
Tack-Free Time	≤1 hour	GB/T 13477.5
Tensile Strength (23°C, 28 days)	≥0.80 MPa	GB/T 13477.8
Tensile Strength after UV Aging (720h)	≥0.6 MPa	GB/T 13477.8
Elastic Recovery (150% extension)	≥85%	GB/T 13477.17
100% Modulus at 23°C	≤0.3 MPa	GB/T 13477.8
Tensile Strength after Water + UV	≥0.45 MPa	GB/T 13477.8
Adhesion under Extension (150%)		GB/T 13477.10–15
Elongation at Break	≥800%	GB/T 13477.8
Thermal Aging: Weight Loss	≤5%
Thermal Aging: Cracking/Powdering
Adhesion Failure Area on Concrete	≤20%	GB/T 13477.8

Typical Applications

• Sealing of airport runways and highway pavement joints
• Expansion joint sealing for concrete roads and pavements
• Infrastructure sealing for subways, tunnels, bridges and rail projects

Application Notes

• Ensure joint surfaces are clean, dry and free from oil, dust or loose materials
• Rusted metal surfaces should be mechanically cleaned before application
• Compatibility testing is recommended according to GB 16776 prior to use
• Suitable application temperature5°C: 45°C

Frosted or damp surfaces must be completely dried before application

Limitations

• Not recommended for substrates that may bleed oils or plasticizers (eg certain rubbers or plastics)
• Primer is required when applied to porous substrates such as concrete or stone
• Not suitable for copper or copper-containing materials due to potential corrosion

Compliance

Complies with Q/CR 601-2017: Joint Sealing Materials for Ballastless Railway Track

Packaging

• 590 ml sausage pack
• 300 ml cartridge

Storage & Shelf Life

• Store in a cool, dry place at 10°C: 27°C
• Shelf life12 months from production date