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SEIMEDA NP Neutral Silicone Sealant is a one-component, neutral-curing silicone sealant developed for window and door installation, general glazing, perimeter joints and non-structural construction sealing. It cures by reacting with moisture in the air to form a durable and flexible elastomer.
With a movement capability of ±20%, a non-corrosive curing system and resistance to outdoor weather exposure, this neutral cure silicone sealant is suitable for compatible glass, aluminum, stainless steel, PVC and coated building materials. Standard products, customized performance grades, colors and private-label packaging are available for distributors, window manufacturers, contractors and OEM brands.
Important: NP Neutral Silicone Sealant is intended primarily for flexible, non-structural sealing. For load-bearing structural glazing, use a tested structural silicone sealant selected according to the project design and applicable standards.
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Product Video
Watch the product and application videos to review extrusion, joint finishing, elasticity and adhesion performance. For project evaluation, we recommend testing the sealant on the actual substrate before bulk purchasing or site application.
Key Features
Neutral Curing System
The neutral moisture-curing formula reduces the risk of corrosion on compatible metals and makes the product suitable for a wider range of construction substrates than general acid-curing silicone. Adhesion and compatibility should still be confirmed on the actual material before use.
Flexible Joint Movement
After curing, the sealant forms a flexible elastomer with a movement capability of ±20%. It can accommodate normal dimensional movement caused by temperature changes, vibration and differences in the expansion rates of adjoining materials.
Weather and UV Resistance
The cured sealant is designed to resist sunlight, rain, temperature changes and general outdoor aging. It can be used for compatible exterior window, door and construction joints when the selected grade meets the project requirements.
Non-Sag Application
The paste consistency supports application on vertical and overhead joints without excessive slumping. Smooth extrusion also helps installers achieve a more consistent joint profile and finish.
One-Component Application
No component mixing is required. The sealant can be applied with standard cartridge or sausage dispensing equipment, depending on the selected packaging format.
Customizable for Different Markets
Formula performance, curing speed, color, packaging and private-label presentation can be discussed according to the target application, climate, distribution channel and order quantity.
Product Advantages
Suitable for General Construction Sealing
The product can be used for compatible window perimeters, door frames, glazing joints, metal joints and other non-structural building connections.
Long-Term Elasticity
The cured seal remains flexible and can accommodate repeated movement within the specified joint design and product movement rating.
Excellent Weather Resistance
UV-resistant, temperature range from -40°C to 150°C
Broader Substrate Compatibility
The neutral curing system is suitable for many glass, metal and coated construction materials. Because coatings and surface treatments vary, an adhesion test is recommended before project use.
Efficient Installation
The one-component formula, smooth extrusion and non-sag consistency support efficient application on construction sites and window production lines.
Suitable for Standard and Private-Label Supply
SEIMEDA can supply standard products as well as selected customized formulas, colors, labels and cartons for importers, distributors and private-label brands.
Main Functions & Applications
Main Functions
•Flexible sealing of non-structural construction joints
•Water, air and dust sealing around compatible window and door systems
•Sealing between glass, aluminum, stainless steel and selected coated materials
•Accommodation of normal thermal movement and vibration
•Interior and exterior joint finishing
Recommended Applications
•Window and door perimeter joints
•Glass-to-aluminum sealing
•General glazing applications
•Aluminum and compatible metal frame joints
•Interior and exterior non-structural construction joints
•Prefabricated building component joints
•Compatible painted and powder-coated surface joints after testing
For a complete window installation system, neutral silicone can be used together with PU foam and interior finishing sealants. See the door and window sealing application guide for product selection by joint position.
Compatible Substrates & Limitations
Compatible Substrates
Glass, aluminum, stainless steel, stone, ceramic, PVC, wood, painted surfaces
Limitations
•Load-bearing structural glazing unless the specific product is tested and approved for that purpose
•Continuous water immersion
•Completely enclosed joints without sufficient exposure to air and moisture for curing
•Surfaces that release oil, plasticizer, solvent or other migrating substances
•PE, PP and PTFE without validated surface treatment and adhesion testing
•Bituminous materials unless compatibility has been confirmed
•Food-contact or potable-water applications without the required product approval
•Application over wet, oily, dusty or unstable surfaces
For structural glazing requirements, select the appropriate structural silicone sealant. For general product comparison, use the sealant selection guide.
Composition
Formulated with high-purity silicone polymers, reinforcing fillers, crosslinkers, and weather-resistant additives to ensure long-term durability.
Technical Specifications
The following data are tested under standard laboratory conditions and provided as a clear performance reference for buyers.
|
Item |
Technical Specification |
Value to You |
|
Appearance |
Smooth, uniform paste |
Easy extrusion and neat joint finish |
|
Sag Resistance |
Vertical ≤ 3 mm |
No slumping on vertical surfaces, material-saving |
|
Extrudability |
≥ 80 mLmin |
Labor-saving, faster application speed |
|
Skin Formation Time |
≤ 3 hours |
Quick skin-over, reduced contamination risk |
|
Tensile Modulus |
≤ 0.45 MPa at 23°C |
Excellent flexibility, accommodates joint movement |
|
Adhesion Under Extension |
No failure |
Strong adhesion and reliable sealing |
FAQ
What substrates is NP Neutral Silicone Sealant suitable for?
NP Neutral Silicone Sealant adheres excellently to glass, aluminum, stainless steel, stone (marble and granite), ceramics, PVC, wood, and most painted surfaces.
What is the difference between neutral and acetic silicone sealants?
Neutral silicone sealants are non-corrosive and safe for metals and stone, offering wider application compatibility, while acetic silicone sealants cure faster but may corrode alkaline substrates.
Can NP Neutral Silicone Sealant be used outdoors?
Yes. It offers excellent weather resistance and UV stability, making it suitable for long-term outdoor applications.
What is the movement capability of NP Neutral Silicone Sealant?
The sealant provides a movement capability of ±20%, accommodating thermal expansion and joint movement.
Is it suitable for stone and metal curtain walls?
Yes. Its neutral, non-corrosive formulation makes it ideal for stone, metal, and glass curtain wall systems.
What surface preparation is required before application?
Surfaces must be sound, clean, dry, and free from dust, oil, or loose materials. A primer may be recommended for certain substrates.
What factors affect the curing time?
Curing time is mainly influenced by temperature and humidity. Higher temperature and humidity accelerate curing, while cold and dry conditions slow it down.
Is it suitable for kitchens and bathrooms?
Yes. It offers excellent water resistance and flexibility, making it ideal for kitchens and bathrooms (mold-resistant versions available).
What is the shelf life and storage condition?
The shelf life is 12 months in unopened original packaging. Store in a cool, dry place below 27°C and away from direct sunlight.
Do you support OEM/ODM and custom colors?
Yes. OEM/ODM services are available, including customized colors, packaging, and branding based on order quantity.
Neutral silicone requirements vary between hardware channels, window installation, exterior perimeter joints and sanitary applications. Product performance should therefore be selected according to the actual use rather than the name “neutral silicone” alone.
| Product Option | Recommended Use | Main Selection Points |
| Standard NP Grade | General window, door and construction sealing | Cost, extrusion, adhesion, skin time and standard colors |
| Professional Exterior Grade | Exterior perimeter and weather-exposed joints | Movement, weather resistance, modulus and substrate compatibility |
| Mildew-Resistant Grade | Compatible kitchen, bathroom and wet-area joints | Mold resistance, cleaning conditions and water exposure |
| Custom OEM Grade | Private-label or market-specific product ranges | Target performance, climate, packaging, color and price positioning |
The availability of each option should be confirmed with SEIMEDA. Final product properties are based on the approved sample and technical specification.
For private-label development, visit our OEM silicone sealant service.
Substrate names alone cannot guarantee adhesion. Surface coatings, cleaning agents, plasticizers, porosity and production treatments can all affect performance. Test the product on representative materials before project use.
| Substrate | General Suitability | Recommended Check |
| Clear glass | Generally suitable | Clean and perform an adhesion test |
| Anodized aluminum | Generally suitable | Confirm surface treatment and adhesion |
| Stainless steel | Generally suitable | Remove oil and test adhesion |
| Powder-coated aluminum | Coating-dependent | Adhesion and compatibility testing required |
| PVC profiles | Formulation-dependent | Check plasticizer migration and adhesion |
| Painted surfaces | Coating-dependent | Confirm that the coating is firmly bonded and compatible |
| Concrete and masonry | Porosity-dependent | Primer and adhesion testing may be required |
| Natural stone | Do not assume suitability | Staining, migration and compatibility testing required |
| Wood | Surface-dependent | Check moisture, coating and adhesion |
| PE, PP and PTFE | Generally difficult to bond | Special surface treatment or another adhesive may be required |
NP Neutral Silicone Sealant is formulated with silicone polymers, reinforcing fillers, neutral curing agents and performance additives. The formulation is designed to provide stable extrusion, flexible curing and resistance to normal construction weather exposure.
The exact curing chemistry and performance grade should be confirmed in the approved Technical Data Sheet for the selected product.
| Product Type | Main Application | Key Difference |
| NP Neutral Silicone Sealant | Windows, doors, glazing and general non-structural construction joints | Neutral curing with broad compatibility on approved building substrates |
| GP Acetoxy Silicone Sealant | Glass, ceramic and compatible sanitary applications | Acid curing, commonly selected for cost-effective general glazing |
| Weatherproof Silicone Sealant | Exterior façade and curtain wall weather joints | Greater focus on outdoor weathering and façade joint movement |
| Structural Silicone Sealant | Engineered structural glazing | Designed and tested for structural bonding applications |
| Two-Component IGU Silicone | Secondary sealing of insulating glass units | Two-component system developed for controlled IGU production |
Use NP Neutral Silicone Sealant when you need a general-purpose, non-corrosive sealant for compatible construction and glazing joints. Choose another product category when the application requires structural bonding, specialized façade performance, non-staining stone compatibility or controlled two-component production.
Confirm that the sealant is compatible with the glass, metal, coating, PVC, masonry or other material involved. Carry out adhesion and compatibility testing where required.
The joint surface must be sound, clean, dry and free from dust, oil, grease, release agents, loose coatings and other contaminants. Use a cleaning method appropriate for the substrate.
Use a suitable backer rod or bond breaker where required to control joint depth and avoid three-sided adhesion. Joint dimensions should be calculated according to expected movement and project requirements.
Cut the nozzle to the required bead size and apply the sealant continuously, ensuring full contact with both joint sides. Avoid trapping air inside the joint.
Finish the joint before the sealant forms a skin. Tooling helps improve substrate contact, joint shape and surface appearance.
Protect the applied sealant from water, contamination and excessive joint movement during early curing. Cold, dry conditions and deep joints require more curing time.
Standard and customized supply options can be discussed according to product grade, destination market and order volume.
| Purchasing Item | Available Options |
| Standard Colors | Transparent, white, black, gray and other colors subject to confirmation |
| Custom Colors | Available according to approved color sample and minimum quantity |
| Packaging | Cartridge and sausage formats subject to the selected product |
| Branding | SEIMEDA brand or private-label packaging |
| Printed Materials | Custom labels, cartridges, cartons and multilingual information |
| Mixed Orders | Different colors or product types can be discussed according to minimum quantities and loading requirements |
| Samples | Standard or customized samples subject to product and project requirements |
For accurate pricing, provide the required packaging size, color, order quantity, destination country and whether you require SEIMEDA or private-label packaging.
Neutral silicone sealant buyers may require technical and quality documents for internal approval, market registration, construction projects or batch inspection.
Available documents and services can include:
Company management-system certifications and product-specific test reports should be presented separately. Please confirm which documents apply to the selected NP product grade and destination market.
To receive an accurate product recommendation and quotation, please provide:
Request Technical Data, Samples and Pricing
Not sure whether neutral silicone is the right product? Use our sealant selection guide or browse all sealants and adhesives by product type.
Payment Methods
We offer flexible and secure payment methods: T/T, Alibaba Trade Assurance (Alibaba.com Pay), and company bank transfer.
Certifications & Project References
ISO 9001, CE, RoHS certified. Product quality insured by PICC
ISO9001
CE
RoHS
PICC
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