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[China]
Address: No.16, Xinyuan Road, Hi-tech Zone, Chengdu 610041, P.R.CHINA
Contact name:nora
Chengdu Guibao Science & Technology Co., Ltd., |
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Silicone Weatherproofing Sealant Class 35 for Curtain Wall
One part, neutral cure silicone sealant with excellent weatherability, ideally suited for movement joints seal.
FEATURES
Excellent weatherability, virtually unaffected by sunlight, rain, snow and ozone.
Neutral cure – suitable for use on metals, coated glass, aluminum panels, terracotta panels, concrete materials, galvanized steel and many other substrates.
Extension/compression movement capability of up to ±35 percent of the original joint width.
Excellent resistance to temperature extremes, stable and flexible over the temperature range from –50 ℃ to +150 ℃.
Excellent unprimed adhesion to a wide variety of building materials.
Easy of application-ready to use as supplied.
Good compatibility with other neutral silicone sealants.
BASIC USES
GB 998 Silicone Weatherproofing Sealant is designed for:
General weather sealing and glazing in glass curtain walls, aluminum curtain walls and terracotta curtain walls.
Sealing the joints of concretes, plastics, metals and etc.
COLOURS
GB 998 is available in black, gray, white and other customized colours.
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 | 90 |
| 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 | % | ±35 | ±35 |
| 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 | |
*GB: Chinese National Standard ASTM: American Society for Testing and Materials ISO: International Standardization Organization | ||||
SPECIFICATIONS
GB 998 is designed to meet or even exceed the requirements of:
Chinese specification GB/T 22083-2008 35HM.
Complies with ASTM C 920.
PACKAGING
GB 998 is available in disposable cartridges (net 300ml) ,24 pieces to a carton and sausages (net 590ml),20 pieces to a carton.
CURE TIME
As exposed to air, GB 998 begins to cure inward from surface. Its tack free time is about 70 minutes, the full and optimal adhesion forms in about 21 days.
SHELF LIFE
It has a shelf life of 12 months from the date of manufacture.
LIMITATIONS
GB 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.
HOW TO USE
Surface Preparation
Clean all joints removing all foreign matter and contaminants such as oil, grease, dust, water, frost, old sealants, surface dirt, or glazing compounds and protective coatings.
Application Method
Install back-up materials or joint fillers, setting blocks, spacer shims, and tapes. Mask areas adjacent to joints to ensure neat sealant lines. Primer is generally not required for non-porous surfaces, but may be necessary for optimal seal performance of certain porous surfaces. So adhesion test is always recommended.
Apply GB 998 in a continuous operation using dispensing guns. Before a skin forms, tool the sealant with light pressure to spread the sealant against the backing materials and joint surfaces. Remove masking tape as soon as the bead is tooled.
SAFETY INFORMATION
GB 998 is a chemical product, not edible, no implantation into body and should be kept away from children.
Cured silicone rubber can be handled without any risk to health.
Should uncured silicone sealant contact with eyes, rinse thoroughly with water and seek medical treatment if irritation persists.
Avoid prolonged exposure of skin to uncured silicone sealant.
Good ventilation required for work and cure places.
TECHNICAL SERVICES
Complete technical information and literature, adhesion testing and compatibility testing are available from Guibao.
DISCLAIMER
The information presented herein is offered in good faith and is believed to be accurate. However, because conditions and methods of using our products are beyond our control, this information should not be used in substitution for customer’s tests to ensure that our products are safe, effective, and fully satisfactory for intended specific applications.
