SY-521
Polyurethane Sealant
Quick Specs
- Appearance
- The cream-like substance is fine and even, and comes in colors such as transparent, bright black and porcelain white.
- Tack-free time (23 °C, 50 % RH)
- 30 min
- Extrudability (Ø 3 mm / 3.0 bar / 23 °C)
- ≥125 g/min
- Shear strength
- 1.5 MPa
- Hardness
- Shore A 54
Specifications
Technical Parameters
| Parameter | Value |
|---|---|
| Appearance | The cream-like substance is fine and even, and comes in colors such as transparent, bright black and porcelain white. |
| Tack-free time (23 °C, 50 % RH) | 30 min |
| Extrudability (Ø 3 mm / 3.0 bar / 23 °C) | ≥125 g/min |
| Shear strength | 1.5 MPa |
| Hardness | Shore A 54 |
| Tensile strength | 3.2 MPa |
| Cure rate / curing speed (23 °C, 50 % RH) | ≥1.2 mm/24 h |
| Colour | Black, white, transparency |
Data Sheets
Specification Documents
Solutions
Related Solutions
Explore how SY-521 fits into our comprehensive sealant solutions for construction and industrial applications.
Resources
Technical Articles
Guides and insights related to polyurethane sealant applications.
Silicone sealant manufacturer note: structural sealant warranty terms are typically defined by the project contract/specs, while product warranty follows Shuangyuan’s 3-year policy and TDS (contact us for selection support such as SY-9900 where applicable).
Silicone sealant manufacturer note: weatherproof sealant focuses on joint sealing and exposure resistance, while structural sealant is for load-bearing bonding/structural glazing—select per project specs and the product TDS.
A simple way to distinguish bulging vs bubbling and assess whether the issue is more likely related to the sealant or the substrate, based on surface appearance and cross-section inspection.
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