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JY999 2 Part Structural Silicone Sealant

JY999 represents a specialized neutral-curing structural silicone elastomer engineered exclusively for curtain wall applications. This high-performance formulation delivers exceptional structural integrity and enduring weather resistance, maintaining reliable performance across extreme temperature variations from -40°C to 90°C. Its advanced adhesion characteristics and mechanical properties ensure long-term stability in structural bonding applications, providing dependable sealing performance for demanding architectural projects where both structural strength and environmental durability are paramount. The product demonstrates particular suitability for complex glazing systems requiring certified structural performance under challenging climatic condition

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Product Advantage

Feature

Odorless, non-corrosive cure system

Cures to form an extremely tough elastomeric rubber ensuring a durable, flexible, watertight bond

Excellent weatherability and high resistance to ultraviolet radiation, heat and humidity, ozone and temperature extremes

Excellent unprimed adhesion to wide range of substrates including coated, enameled, and reflective glasses; anodized and polyester coated or painted aluminum profiles including most fluoropolymer-based paints

Successfully tested for use in protective glazing applications

Technical Parameters

Test Items		Technical Indicators /GB	Test Results	Remarks
Sag	Vertical Placement/mm	≤3	0	Qualified
Sag	Horizontal Placement	Zero	Zero	Qualified
Application time/min		≥20	20	Qualified
Surface Dry Time/h		≤3	2	Qualified
Hardness		20–60	48	Qualified
Heat&Aging Resistance	Thermal Weight Loss%	≤10	2	Qualified
	Crack	Zero	Zero	Qualified
	Chalking	Zero	Zero	Qualified
tensile strength and elongation at normal condition (23℃)	Tensile Strength at Ultimate Enlongation/Mpa	≥0.6	1.41	Qualified
	Destruction area /%	≤5	0	Qualified
	Elongation at break/%	≥100	118	Qualified
tensile strength and elongation @90℃	Tensile Strength at Ultimate Enlongation/Mpa	≥0.45	0.96	Qualified
tensile strength and elongation @90℃	Destruction area /%	≤5	0	Qualified
tensile strength and elongation @−30℃	Tensile Strength at Ultimate Enlongation/Mpa	≥0.45	1.89	Qualified
tensile strength and elongation @−30℃	Destruction area /%	≤5	0	Qualified
tensile strength and elongation after immersion	Tensile Strength at Ultimate Enlongation/Mpa	≥0.45	1.21	Qualified
tensile strength and elongation after immersion	Destruction area /%	≤5	0	Qualified
tensile strength and elongation after exposure to UV	Tensile Strength at Ultimate Enlongation/Mpa	≥0.45	1.14	Qualified
tensile strength and elongation after exposure to UV	Destruction area /%	≤5	0	Qualified
tensile strength@23℃	Tensile modulus at elongation of %10(Kpa)	/	228.5	Qualified
	Tensile modulus at elongation of %20(Kpa)	/	452,6	Qualified
	Tensile modulus at elongation of %40(Kpa)	/	759.6	Qualified
Conclusion	The batch of products detected by the judge: ( ) Qualified ( ) Unqualified

Product Uses

Application:

Structural joints of small and medium-sized buildings

Protective Glass Sealant (bomb blasts, school security glazing, severe weather, etc.)

Structural bonding of glass and other curtain wall.

Structural bonding for industrial purposes or other buildings.

Secondary sealing of structural insulating glass

Product Operate Guide

Step 1: Make sure compatibility and adhesion between sealants and adhesive material before using.

Step 2: The sealant displays excellent adhesive effect in the clean environment with temperature of 4℃-40℃and Relative Humidity(RH)of40%-80%.

Step 3:Surface cleaning for bond substrates, clean up the dirt, grease and other contaminants, then affixedtemporary protective tape.

Step 4: According to the size you want, cut out sealant mouth.

Diameter of Gun nozzle should be smaller than the thickness ofthe sealant injection place, it makesnozzle can stretch into the 1/2 depth of the sealant injection place. Start to inject sealant whensubstrate surface is completely dry, Extrusion and injection of sealant shall be continuous ,whichmakes sure the extrusion of sealant is continuous and uniform cylinder, the move the gun slowly anduniformly, make sure the substrate interface is full of silicone sealant. Quick move is not allowed forthe gun, it will cases bubbles or holes.

Step 5: Decoration should be carried out when the injection is finished, and remove temporary protective tape.

1.Surface Cleaning

2.Affixed Tape

3.Sealant Mouth Cutting

4.Injection

5.Surface Fixing

6.Tape Remove

7.Finish

FAQ

What special curing measures are required in low-temperature environments?

When temperatures fall below 5°C, supplemental heating and extended protection periods are necessary to ensure proper cure development.
How does the high modulus characteristic affect substrate stress?

The engineered modulus balances structural strength with stress distribution, minimizing potential substrate deformation while maintaining load capacity.
Can fresh sealant create chemical bonds with previously cured sections?

New applications will form mechanical bonds only with fully cured material, requiring proper surface preparation and compatible primer when needed.
What quality verification methods are available during installation?

Regular pull-off adhesion testing and shore hardness measurements provide immediate performance validation prior to full cure completion.
How does the product withstand prolonged dynamic loading conditions?

The molecular structure maintains elastic memory under sustained tension, resisting stress relaxation in applications experiencing continuous vibration or wind-induced movement.