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Views: 0 Author: Site Editor Publish Time: 2025-07-05 Origin: Site
When it comes to protecting your building from water damage, choosing the right 100% silicone waterproof roof coating is critical. In this article, we’ll compare two top-performing products TW320 and TW321, to help you decide which one best fits your project's needs.
Both TW320 and TW321 are one-component, solvent-free, high-performance silicone coatings designed for roof waterproofing. They come in white and grey, can be applied by brush, roller, or spray, and offer excellent weather resistance and UV stability. These coatings adhere well to a variety of substrates including concrete, metal, asphalt, and modified bitumen.
While both coatings offer outstanding waterproofing capabilities, they differ in certain performance metrics. Here's a side-by-side technical comparison:
| Specification | TW320 | TW321 |
|---|---|---|
| Solids Content | 99.7% | ≥80% |
| Tensile Strength | 1.59N/mm2 | 0.5~0.6N/mm2 |
| Full dry time | 24h/1-2mm | ≤3 hours |
| Shore A Hardness | 20-30 | 21 |
If your roofing project demands maximum mechanical strength, higher durability, and minimal volume loss, then TW320 is your go-to option. It is especially recommended for high-exposure or heavy-load roofing systems where performance under tension is critical.
Conversely, TW321 is an excellent choice for projects that require quick application and fast curing, such as time-sensitive renovations or emergency waterproofing. Its elasticity and ease of use make it a practical solution for less demanding environments or where flexibility is more important than strength.
At KW Sealant, our silicone roof coatings are engineered to deliver:
Long-term waterproof protection
Excellent UV and thermal resistance
Strong adhesion to various roofing materials
Eco-friendly, low-VOC, solvent-free formulations
Easy application and maintenance
Still not sure which one to choose—TW320 or TW321? Our technical team is here to help.
Contact us for professional advice, free samples, or a tailored solution for your waterproofing needs.
Visit product pages:
TW320 - 100% Silicone Roof Coating
TW321 - 100% Silicone Waterproof Coating
