998 Silicone Weatherproofing Sealant
Details
998 Silicone Weatherproofing Sealant
1. weatherproofing joint seal for the curtain wall
2. ±25% movement capacity
PRODUCT FEATURES
1.Good weatherability, virtually unaffected by sunlight, rain, snow and ozone
2.Neutral cure-suitable for use on metals, coated glass, aluminum panels, terracotta panels, concrete materials, galvanized steel and many other substrates.
3.Extension/compression movement capability of up to ±25 percent of the original joint width
4.Good resistance to temperature extremes, stable and flexible over the temperature range from –50 to +150 ℃
5.Good unprimed adhesion to a wide variety of building materials
6. Easy of application-ready to use as supplied
7. Good compatibility with other neutral silicone sealants
COLOURS
998 is available in black, gray, white and other customized colours.
PACKAGING
998 is available in disposable cartridges (net 300ml) and sausages (net 590ml)
Typical properties：
These values are not intended for preparing specifications.
Test Method | Property | Unit | Standard | Result |
GB/T 13477 (ISO 7390) | Slump | mm | ≤3 ≤3 | 0 0 |
GB/T 13477 (ISO 8394) | Extrusion rate | ml/min | ≥80 | 856 192 |
GB/T 13477(ASTM D 2377) | Tack free time | h | ≤3 | 1.1 |
GB/T 13477 (ISO 7389) | Extension recovery | % | ≥80 | 97 |
GB 16776 (ISO 10563) | Weight loss | % | ≤10 | 5.6 |
GB/T 13477 (ISO 8339) | Modulus at 23℃ | MPa | ＞0.4 | 0.84 |
GB/T 13477 (ISO 11600) | Movement capability | % | ±25 | ±25 |
GB/T 13477 | Extension/compression rate | % | ±25 | ±25 |
GB/T 13477 | Adhesion at fixed stretch |
| No failure | No failure |
GB/T 13477 | Adhesion after heat contract and cold extension |
| No failure | No failure |
GB/T 13477 | Adhesion after UV-water exposure |
| No failure | No failure |
STORAGE AND SHELF LIFE
998 should be stored at or below 27℃ in original unopened containers. It has a shelf life of 12 months from the date of manufacture.
LIMITATIONS
998 should not be applied:
As structural sealant;
To the materials that bleed oils , plasticizers or solvents, such as impregnated wood, oil-based caulks;
In totally confined spaces as sealant requires atmospheric moisture for cure;
To frost laden or damp surfaces;
For continuous water immersion;
When substrate surface temperature below 4℃ or over 50℃ to copper, zinc or lead coated surfaces.
