Siwin-WE2900
Siwin
Siwin-WE2900
100%
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Siwin-WE2900 is a concentrated water-repellent agent based on a preparation of silanes and modified polysiloxanes. Formulated as a 100% active concentrate, this product is designed for industrial clients who manufacture solvent-based impregnation solutions and primer coatings for mineral building substrates. It is produced by Nanjing Siwin New Material Co., Ltd., a manufacturer specializing in silicone-based construction chemicals.
The waterproofing mechanism relies on the chemical reaction between silane/siloxane molecules and the hydroxyl groups present on mineral substrate surfaces. Through hydrolysis and condensation reactions, the active components form siloxane bonds with the substrate, creating a hydrophobic treatment that penetrates into the pore structure of the material. Unlike surface coatings that form a film, this impregnation treatment lines capillary walls with hydrophobic groups while maintaining the substrate's water vapor permeability.
Property | Specification |
Appearance | Slightly yellowish liquid |
Active Ingredient | 100% |
Specific Gravity at 20°C | 0.97 g/cm³ |
Product Code | Siwin-WE2900 |
The product is supplied as a concentrate and requires dilution with appropriate organic solvents before field application. The concentrated form offers advantages in transportation efficiency and storage footprint for commercial users who prepare working solutions on-site or at regional formulation facilities.
The dilution ratio of Siwin-WE2900 depends on the absorption capacity of the substrate material. For most mineral surfaces, the concentrate is diluted at ratios ranging from 1:9 to 1:14 (product to solvent). Suitable solvents include aliphatic hydrocarbons, aromatic hydrocarbons, and isoparaffins. The selection of solvent type and dilution ratio should be determined based on substrate porosity tests conducted on sample materials.
Highly absorbent substrates such as lightweight concrete and porous natural stone typically require a lower dilution ratio (more concentrate), while denser materials such as dense brick and clinker can be treated with higher dilution ratios. Pre-application absorption testing is recommended to establish the optimal dilution for each project.
The diluted solution is applied to absorbent surfaces using brush, roller, or overflow coating methods. To ensure uniform penetration and consistent treatment, a two-coat "wet-on-wet" application is recommended. The second coat is applied while the first coat is still wet, allowing deeper penetration into the substrate before the surface dries.
Application conditions should be evaluated for temperature and humidity. The product reacts with atmospheric moisture during curing, so ambient humidity influences the curing rate. Material safety data sheets provide specific guidance on temperature ranges and environmental conditions for optimal application results.
Siwin-WE2900 is formulated for impregnation treatment of a wide range of mineral building materials. Compatible substrates include brick, clinker brick, sand-lime brick, natural stone, concrete, and mineral plasters. Each substrate type has different porosity characteristics, which influence the recommended dilution ratio and coverage rate.
In addition to direct impregnation, the product functions as a primer for various coating systems, including acrylic paints and plasters, silicone resin paints and plasters, and other protective coatings. Applied as a primer, it reduces substrate absorption and improves the uniformity of subsequent topcoat application.
The product can be applied to humid construction materials and strongly alkaline substrates, making it suitable for new construction projects where concrete has not fully cured or where high-pH materials such as fresh mortar and render are present. This compatibility reduces waiting time between substrate installation and waterproofing treatment in construction schedules.
Siwin-WE2900 is supplied in sealed drums to prevent moisture contamination during storage and transportation. Specific packaging sizes can be confirmed with the sales team for commercial procurement orders.
Storage temperature affects product stability. At temperatures below 0°C, the product may solidify. If this occurs, heating the material to 20-25°C and stirring restores it to usable condition without affecting performance. At temperatures above 40°C, the product may separate or form sediment. Cooling to 20-25°C followed by thorough mixing restores homogeneity.
The product reacts with atmospheric moisture, so prolonged exposure to open air must be avoided. Drums should be kept tightly sealed at all times when not in active use. Irreversible degradation can occur if the product absorbs significant moisture from the environment. Users should reseal containers immediately after each use and verify that drum lids are properly secured.
Nanjing Siwin New Material Co., Ltd. maintains quality control procedures for each production batch of Siwin-WE2900. Testing includes verification of active ingredient content, specific gravity measurement, and visual inspection of appearance and clarity. Batch records are maintained to support traceability for industrial clients requiring quality documentation.
The company's manufacturing facility follows established production protocols for silane and polysiloxane-based products. Technical support personnel are available to assist business buyers with formulation guidance, substrate compatibility questions, and regulatory documentation for international shipments.
The correct dilution ratio depends on the porosity and absorption rate of the specific substrate. Conduct a small-scale test on a sample of the material by applying solutions at different dilution ratios and evaluating water beading performance and penetration depth. For highly porous substrates, start with a 1:9 ratio; for denser materials, a 1:14 ratio may be sufficient.
Yes, Siwin-WE2900 can be applied to humid construction materials. The product is compatible with damp substrates and strongly alkaline surfaces, such as fresh concrete or newly installed masonry. However, standing water on the surface should be removed before application to ensure proper penetration.
The service life of the treatment depends on multiple factors, including substrate type, dilution ratio, application thickness, exposure conditions, and mechanical wear. Impregnation treatments that penetrate deeply into the substrate generally provide longer-lasting performance than surface-only treatments. Specific durability data should be evaluated based on project-specific conditions and testing.
Yes, Siwin-WE2900 can be used as a primer for acrylic paints and plasters, silicone resin paints and plasters, and other coating systems. The hydrophobic treatment reduces substrate suction, which can improve the uniformity and appearance of subsequently applied coatings. Users should conduct compatibility tests with specific coating products before full-scale application.
