Silicone
Si790 Silicone Mastic
A single-component, high-solids, neutral-cure silicone mastic for roof detailing, sealing and repair. Its thick, non-sag consistency bridges surface irregularities and cures without acidic byproducts, so it suits sensitive metals and coated surfaces.
- Packaging
- 2 gal pail
- Color
- White, black
Compatible substrates
Si790 is specified in 5 roof systems — open one for the full build-up.
| Solids by weight ASTM D 1644 | 99 % |
|---|---|
| Solids by volume ASTM D 2697 | 98 % |
| Weight per gallon ASTM D 1475 | 11.3 lbs |
| Slump ASTM D 2202 | No sag |
| Tensile strength ASTM D 2370 | 215 psi |
| Elongation ASTM D 2370 | 525 % |
| Tear strength ASTM D 624 | 31 lbf/in |
| Hardness ASTM D 2240 | 27 Shore A |
| Movement capability ASTM C 719 | ± 35 % |
| Tack-free time ASTM C 679 | 45 minutes |
| VOC EPA Method 24 | < 20 g/L |
Need a spec letter for this system?
Our reps write them for building owners and architects.