Construction Silicone Weatherproofing Sealant Class 35
One part, neutral cure silicone sealant with excellent
weatherability, ideally suited for movement joints seal.
These values are not intended for preparing specifications.
|GB/T 13477 (ISO 7390)||Slump||mm|
|GB/T 13477 (ISO 8394)||Extrusion rate||ml/min||≥80|
|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℃|
|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
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
Easy of application-ready to use as supplied.
Good compatibility with other neutral silicone sealants.
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.
GB 998 is available in black, gray, white and other customized
GB 998 is designed to meet or even exceed the requirements of:
Chinese specification GB/T 22083-2008 35HM.
Complies with ASTM C 920.
GB 998 is available in disposable cartridges (net 300ml) ,24 pieces
to a carton and sausages (net 590ml),20 pieces to a carton.
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.
It has a shelf life of 12 months from the date of manufacture.
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
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
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.
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.
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.
Complete technical information and literature, adhesion testing and
compatibility testing are available from Guibao.
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