Two-Component Silicone Structural Glazing Sealant for Aluminium Curtain Walls

• CAS No.: 63148-60-7
• Bonding Function: Structural Adhesive
• Morphology: Paste
• Application: Construction
• Material: Silicone
• Classification: Room Curing
• Model NO.: 992
• Main Agent Composition: Pdms
• Characteristic: Waterproof
• Promoter Composition: Curing Agent
• Composition: Organic Material
• Color: Part a: White; Part B: Blackdms
• Transport Package: Drum; Pail
• Specification: Part A in 190L/drum; Part B in 19L/pail
• Trademark: GUIBAO
• Origin: China
• HS Code: 3506100010
• Production Capacity: 200, 000 Tons/Year

Product Description

Two part silicone sealant specially designed for structural glazing. 

Basic Uses
GUIBAO 992 Silicone Structural Glazing Sealant is designed for

1. Structural bonding and glazing applications for glass curtain walls, aluminium curtain walls, terracotta curtain walls and metal structures
2. Structural secondary seal of insulating glass
3. Other construction structural glazing applications

Features

1. Two parts , neutral cure to form an extremely tough elastomeric rubber ensuring a durable, flexible, and watertight bond
2. Non-corrosive to metals, coated glass, low-E glass and many other substrates
3. Excellent weatherability and high resistance to UV radiation ,heat and humidity, and ozone
4. Excellent stability through wide temperature range from -50 ºC to +150 ºC
5. High level of mechanical properties
6. Good compatibility with other neutral silicone sealants

Colours
Part A (base) of GUIBAO 992 is available in white, part B (curing agent) in black; Black colour after mixing.

Packaging
GUIBAO 992 is available in kit: part A in 200L drums (net 190L) ,part B in 20L pails (net 19L).

Specifications
GUIBAO 992 is designed to meet or even exceed the requirements of 

1. Chinese national specification GB16776-2005 Silicone Sealant for Structural Glazing
2. Complies with ASTM C 1184-2005

Storage and Shelf Life
GUIBAO 992 should be stored in original unopened containers. It has a shelf life of 12 months from the date of manufacture.

Typical Properties

Test Method	Property	Unit	Standard	Result
GB/T 13477 (ISO 7390)	Slump	mm	≤3	0
GB/T 13477 (ASTM D 2377)	Tack free time	h	≤10	0.8
GB/T 13477	Working time (after 20 min.)	s	≤10	2.2
GB/T 531.1 (ISO 7619)	Hardness	Shore A	20-60	43
GB 16776 (ASTM C792)	Heating aging
	Weight loss	%	≤10	3.5
	Chalking		Nil	Nil
	Cracking		Nil	Nil
GB/T 13477 (ISO 8339)	Tensile strength	MPa
	23ºC		≥0.60	1.13
	90ºC		≥0.45	1.02
	-30ºC		≥0.45	1.3
	Water immersion		≥0.45	1.01
	Water-UV exposure		≥0.45	1.09
	Adhesion failure	%	≤5.00	0
	Elongation at ultimate tensile strength at 23ºC	%	≥100	140

GB: Chinese National Standard
ASTM: American Society for Testing and Materials
ISO: International Standardization Organization

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.

Mixing and Dispensing
To obtain the optimal performance of GUIBAO 992, it is recommended that base and curing agent thoroughly mixed using an airless two-part silicone dispensing machine.

GUIBAO 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.

Priming
Priming is not usually required when using GUIBAO 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.

Equipment Cleaning
When not being used, it is recommended that the dispensing equipment be purged either with the base component or flush with suitable solvent.

Limitations 
GUIBAO 992 should not be applied:

1. To the materials that bleed oils , plasticizers or solvents, such as impregnated wood, oil-based caulks
2. In totally confined spaces as sealant requires atmospheric moisture for cure
3. To frost laden or damp surfaces
4. For continuous water immersion
5. When surface temperature below 4ºC or over 50ºC

Safety Information 

1. GUIBAO 992 is a chemical product, not edible, no implantation into body and should be kept away from children.
2. Cured silicone rubber can be handled without any risk to health.
3. Should uncured silicone sealant contact with eyes, rinse thoroughly with water and seek medical treatment if irritation persists.
4. Avoid prolonged exposure of skin to uncured silicone sealant.
5. Good ventilation needed for work and cure places.

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.

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