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The Neutral Silicone Sealant Manufacturer!

Taizhou Qingkai Adhesive Co., Ltd. and our associated factory (Zhejiang Qingkai New Material Technology Co., Ltd.) are located in Taizhou, Zhejiang. which covers with convenient transportation access connecting with Ningbo Port. It is a high tech enterprise with a full industry chain integrating design, R & D, production and sales of silicone sealants, polyurethane foam agents, tile adhesives and other diversified building materials.

Curtain Wall Structural Silicone Adhesive
Engineered for large-scale structural engineering projects, our high-performance curtain wall sealant delivers unparalleled flexibility, superior adhesion, and extreme durability. With exceptional
Neutral Structural Silicone Sealant
Engineered for precision indoor applications, QK-995 delivers industrial-grade adhesion and permanent waterproofing with the safety of true neutral cure technology. Trusted by contractors for
High-quality Neutral Silicone Weatherproof Sealant
Engineered for critical building envelope protection, our premium neutral-cure silicone delivers permanent weatherproofing with uncompromised material safety. Certified for structural joints, curtain
Neutral Weatherproofing Silicone Sealant
Engineered for permanent exterior sealing, our neutral-cure silicone weatherproof sealant delivers exceptional UV/weather resistance and active mold prevention for construction joints, perimeter
Weatherproof Glazing Silicone Sealant
Engineered for demanding architectural applications, our high-performance structural silicone sealant delivers secure bonding across glass, stone, metal curtain walls, and skylights. Featuring Class
Silicone Sealant for Doors And Windows
Engineered for premium windows and doors, our corrosion-free silicone delivers surgical-grade weathersealing with zero-compromise material safety. Certified for thermally broken systems, sliding
High-performance Anti-mildew Silicone Sealant
Single-component, deoxymethane type, neutral curing, easy to use; strong bonding ability, no corrosion, can bond well with most building materials without primer; after curing, the product forms a
Pollution-free Stone Silicone Sealant
Specially designed for preventing mold in kitchens and bathrooms. It has an extremely fast curing speed and can effectively prevent mold growth, keeping the area clean and hygienic without turning
Pollution-free Mirror Silicone Sealant
Specialized, non-staining sealant engineered exclusively for mirrors and silver-backed glass applications. Formulated to prevent corrosion, discoloration, and silvering failure, it ensures a
Special Silicone Sealant for Stainless Steel
Precision-engineered for critical stainless steel bonding, QK-770 delivers industrial-strength adhesion in 8 minutes with military-grade corrosion protection. Trusted by manufacturers where fast
Flame-retardant Silicone Sealant
Engineered for life-safety critical applications, our flame-retardant silicone sealant delivers exceptional fire containment with F1-10 certification (GB/T 2408 highest class) while maintaining
Colorful Curtain Wall Structural Silicone Sealant
Precision-engineered for signature buildings, our oil-free silicone offers 125 RAL & Pantone® certified colors with permanent color stability across conservatories, aluminum composite panels, and

Why choose us

Advanced Manufacturing Capacity

Automated lines and large daily output ensure consistent quality, stable lead time, and reliable bulk supply for international projects.

Strong OEM / ODM Support

Professional R&D and flexible production systems allow formula, packaging, and branding customization for different markets and applications.

Quality Assurance

We are followed to Quality Management System requirements and our full product line conform to the C T C Weather resistant Sealant Grading requirements (25, 35, 50 levels) from China Building Materials Certification Center.

Test Parameter	Unit	Result Translucent Pigmented
As Supplied Tested at 23ºC and 50% RH
Specific Gravity	G/ml	1.00±0.02	1.43±0.02
Flow (sag or slump)	Mm	0	0
Extrusion Rate Skin Time	Ml/minute Minute	100 5~10	123 ≤80
Tack-free Time	Hour	≤1	≤8
Curing time (5mm)	Hour	≤12	≤15
As Cured-after 21 days at 23ºC and 50% RH
Durometer Hardness, Shore A	Points	28	36
Elastic Recovery	%	98	98
Movement Capability	%	±25	±40
Tensile/Modulus at 50% Elongation	Mpa	0.27	0.52
Tensile/Modulus at 100% Elongation	Mpa	0.35	0.68
Ultimate Tensile Strength Ultimate Elongation at Break	Mpa %	0.37 175	0.84 400

Advantages of Neutral Silicone Sealant

Compatibility with a wider range of substrates:

Acidic cure sealants can react with certain materials, causing discoloration or corrosion. Neutral cure sealants do not have this issue.

Reduced risk of staining:

Acidic cure sealants can stain porous materials like marble and granite. Neutral cure sealants do not pose this risk.

High-quality Neutral Silicone Weatherproof Sealant

Better Adhesion To Sensitive Substrates:

Neutral cure sealants can adhere better to sensitive substrates like aluminum and stainless steel.

Lower odor:

Neutral cure sealants typically have a lower odor than acidic cure sealants.

Applications of Neutral Silicone Sealant

Industrial bonding and sealing
Silicone sealants bond metals and plastics in vehicle bodywork, appliances, and motor housings.

Non-corrosive silicone for electronics
Neutral cure silicones protect components without corroding contacts. They guard against moisture and heat.

High Temperature RTV for Transportation
Marine, aerospace, and rail industries use neutral silicones for sealing and vibration control in harsh conditions.

Silicone sealant for HVAC ducts
Silicones seal duct joints and metal fittings.

Facade Sealing
Silicones seal concrete and aluminum panel joints.

Glazing
Neutral cure silicones bond glass to frames in high-rise buildings. They offer flexibility and weather resistance.

Solar Energy Systems
Silicones seal solar panels and junction boxes. They resist UV and ensure long-term durability.

Firestop Systems
Special neutral silicones help maintain fire ratings in sealed structural penetrations.

Composition and Formulation of Neutral Silicone Sealant

Base Polymer (Hydroxyl-Terminated Polydimethylsiloxane): Provides the elastic matrix, excellent temperature resistance, and weatherability.

Crosslinker (Alcohol- or Oxime-Type): Reacts with moisture in the air to form a durable three-dimensional network while releasing harmless alcohol or ketoxime byproducts.

Fillers (Silica, Calcium Carbonate, Fumed Silica): Enhance tensile strength, control viscosity, and impart thixotropic behavior.

Plasticizers (Silicone Oils): Improve low-temperature flexibility and workability during application.

Coupling Agents (Silane Coupling Agents): Promote stronger adhesion by improving interfacial compatibility between sealant and substrate.

Catalysts (Organotin or Titanium Compounds): Accelerate cure rates, reducing surface-dry and full-cure times.

Additives (Mildew Inhibitors, UV Absorbers, Pigments): Tailored to specific performance requirements such as color stability, mold resistance, and UV protection.

Certifications

Ordering Process

Inquiryprice

Confirmation

We will provide options and finalize the design.

Payment

Upon confirmation, proceed with payment.

Sample Approval

Samples will be provided for your approval.

Production

Upon sample approval, we will begin production.

Quality Inspection

Each product undergoes a thorough quality inspection.

Shipping

We ensure timely and safe delivery.

After-sales service

Our team is always available to answer any after-sales inquiries.

Hard Packaging

Warranty: 9 months
Net volume: 300ml
Packaging quantity: 24 pcs per box

Aluminum Film Packaging

Warranty: 9 months
Net volume: 592ml
Packaging quantity: 20 pcs per box

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Q: What is the main advantage of neutral silicone sealant over acetoxy silicones?

A: Neutral silicone sealant cures without acetic acid by-products, reducing risk of corrosion and staining on metals, stone, or sensitive coatings—making it preferable for glazing and many facade applications.

Q: Are neutral silicone sealants suitable for structural glazing?

A: Yes—many neutral silicones are formulated for structural and non-structural glazing. For structural applications, always use products explicitly specified for structural glazing and follow manufacturer structural glazing guidelines and certifications.

Q: How do I verify a neutral silicone sealant meets standards for my project?

A: Request the product's TDS and SDS, look for CE/EN and ASTM test data where applicable, and ask for sample mock-ups to verify adhesion and movement performance on project substrates.

Q: What maintenance is required for neutral silicone joints?

A: Periodic inspection for adhesion, tearing, or UV degradation is recommended. For exterior applications, clean and repair any failed joints promptly; many neutral silicones can be over‑caulked after tooling and partial removal of failed material.

Q: How quickly do neutral silicone sealants cure?

A: Cure time depends on chemistry, bead size, temperature, and humidity—skin formation usually occurs within minutes to an hour, but full cure can take 24–72 hours or longer for wide joints. Check the product TDS for specific cure profiles.

Q: Can I buy samples placing orders?

A: Yes.Please feel free to contact us.

Q: What is your lead time?

A: It depends on the order quantity and the season you place the order. Usually we can ship within 7-15 days for small quantity,and about 30 days for large quantity.

Q: What is your payment term?

A: T/T,Western Union,Alipay,MoneyGram,and Paypal.This is negotiable.

Q: What is the shipping method?

A: It could be shipped by sea,by air or by express(EMS,UPS,DHL,TNT,FEDEX and ect).Please confirm with us before placing orders.

As one of the most professional neutral silicone sealant manufacturers and suppliers in China, we're featured by quality products and good price. Please rest assured to buy bulk cheap neutral silicone sealant from our factory. Contact us for more details.

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