Two Part Silicone Structural Glazing Sealant for Curtain Wall
Two part silicone sealant specially designed for structural
Two parts , neutral cure to form an extremely tough elastomeric
rubber ensuring a durable, flexible, and watertight bond.
Non-corrosive to metals, coated glass, low-E glass and many other
Excellent weatherability and high resistance to UV radiation ,heat
and humidity, and ozone.
Excellent stability through wide temperature range from –50 ℃ to
High level of mechanical properties.
Good compatibility with other neutral silicone sealants.
Part A (base) of GB 992 is available in white, part B (curing
agent) in black; Black colour after mixing.
GB 992 Silicone Structural Glazing Sealant is designed for:
Structural bonding and glazing applications for glass curtain
walls, aluminium curtain walls, terracotta curtain walls and metal
Structural secondary seal of insulating glass.
Other construction structural glazing applications.
These values are not intended for use in preparing specifications
|GB/T 13477 (ISO 7390)||Slump||mm||≤3||0|
|GB/T 13477 (ASTM D 2377)||Tack free time||h||≤3||0.8|
(after 20 min.)
GB/T 531.1 (ISO 7619)
|GB 16776 (ASTM C 792)||Heat Aging|
|GB/T 13477 (ISO 8339)||Tensile strength|
ultimate tensile strength at 23℃
*GB: Chinese National Standard.
ASTM: American Society for Testing and Materials.
ISO: International Standardization Organization.
GB 992 is available in kit: part A in 200L drums (net 190L), part B
in 20L pails (net 19L).
GB 992 is designed to meet or even exceed the requirements of:
Chinese national specification GB16776-2005 Silicone Sealant for
Complies with ASTM C 1184.
STORAGE AND SHELF LIFE
It has a shelf life of 12 months from the date of manufacture.
GB 992 should not be applied:
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 surface temperature below 4℃ or over 50℃.
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.
Mixing and Dispensing
To obtain the optimal performance of GB 992, it is recommended that
base and curing agent thoroughly mixed using an airless two-part
silicone dispensing machine.
GB 992 should be mixed at a ratio of 9:1～11:1 base to curing agent
by volume or 11:1～13:1 base to curing agent by weight.
Lot matching of GB 992 base to curing agent is not required. Before
use, it is recommended that curing agent be fully stirred to ensure
the homogeneity of all components.
GB992 part B curing agent will react with atmospheric moisture,
therefore should not be exposed to air for prolonged periods of
Priming is not usually required when using GB 992. But it is
essential that adhesion is tested prior to use to decide whether to
use primer or not.
Masking and Tooling
Areas adjacent to joint may be masked to ensure a neat sealant
line. Do not allow mask tape to touch clean surfaces to which the
silicone sealant is to adhere. Tooling should be completed in one
continuous stroke after sealant application. Masking tape should be
removed immediately after tooling.
When not being used, it is recommended that the dispensing
equipment be purged either with the base component or flush with
GB 992 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 needed 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