Siliconates & Specialty Auxiliaries
Silicone Water Repellent Powder (Sodium Type) | Manta WR-P02
Manta WR-P02 is a solid silicone water repellent, a powdered sodium methyl siliconate (CAS 16589-43-8) for cementitious materials. It is dry-blended into mortars, tile grouts, wall putties and waterproofing slurries, where it reacts on hydration with silicate hydroxyl groups to form a three-dimensional hydrophobic network within the porous matrix.
- Grade
- WR-P02
- Chemical Name
- Sodium methyl siliconate powder
- CAS No.
- 16589-43-8
- Form
- White Powder
Overview
Manta WR-P02 is a solid silicone water repellent, formulated as a powdered form of sodium methyl siliconate to give capillary-penetrating and hydrophobizing properties in cementitious materials. It is an easy-to-blend active additive for dry-mix formulations.
The mechanism is moisture-activated. On contact with water during mixing, the reactive silanol groups in its structure bond chemically with the hydroxyl groups of silicate-based building materials. This covalent reaction neutralizes capillary suction and builds a three-dimensional hydrophobic network within the porous matrix. As it cures, it also contributes to a denser internal matrix in the cementitious system.
Both WR-P02 and the potassium-based Manta WR-P01 are dry-mix powders. WR-P02 is specified at ≥ 90% solid content, against ≥ 98% for WR-P01, and its TDS also covers rigid and semi-flexible cementitious waterproofing slurries. For a liquid sodium methyl siliconate, see Manta MSES.
Key Features
- Moisture-activated reaction on contact with mixing water
- Bonds covalently with hydroxyl groups of silicate building materials
- Three-dimensional hydrophobic network within the porous matrix
- Contributes to a denser internal cementitious matrix
- Dry-blends with cement, sand and aggregates
- Preserves vapor permeability in wall putties and EIFS
Specifications
| Property | Typical Value |
|---|---|
| Appearance | White Powder |
| Solid Content | ≥ 90% |
| Methylsilsesquioxane Content (as CH3SiO1.5) | ≥ 50% |
| pH | 12-14 |
| Flammability | Not flammable |
Typical values from the current Technical Data Sheet.
Applications
- Dry-mix mortars and tile grouts: integral water repellent for tile grouts, joint fillers and decorative stucco, significantly reducing water absorption and mitigating the migration of waterborne salts
- Exterior wall putty and EIFS: additive for exterior wall putty powders and Exterior Insulation and Finish Systems, protecting facades from driving rain while preserving the vapor permeability of the protective layers
- Cementitious waterproofing slurries: active ingredient in rigid and semi-flexible cementitious waterproofing coatings for roofs, basements, bathrooms and retaining walls
- High-absorbent inorganic aggregates: dry-blending with porous lightweight aggregates such as expanded perlite, gypsum powders and thermal insulation materials to add moisture protection
Application Guidelines (How to Use)
1. Integral Waterproof Mortar / Concrete
Dosage: Add Manta WR-P02 at 0.4% to 0.5% by weight of cement.
Mixing: To ensure optimal dispersion, dry-blend the WR-P02 powder thoroughly with the cement, sand, and aggregates before adding water.
Application: Proceed with standard mortar/concrete placement and curing methods.
2. Leakage Repair & Patching
Preparation: Mechanically profile smooth surfaces. Active water leaks must be plugged with a rapid-setting water-stop compound first.
Execution: Apply a slurry bond coat, followed immediately by the WR-P02 treated waterproof mortar.
3. Surface Spray Coating (Liquid Anti-Seepage)
Dilute 1 part WR-P02 powder with 50 to 70 parts of clean water. Spray directly onto highly absorbent inorganic substrates (concrete, fired bricks, roof tiles) to create an immediate moisture-proof barrier.
4. Pre-Packaged Waterproof Cement & Putties
Incorporate WR-P02 at a dosage of 0.4% - 0.5% by total dry weight into putty powders, tile grouts, or compatible dry-mix formulations to significantly enhance weather resistance.
Related applications: Liquid Waterproofing & Construction · Paints & Coatings
Packaging & Storage
Supplied in 25 kg bags. This agent dissolves in water. During transportation, pay attention to waterproofing and moisture-proofing to prevent rain and packaging damage. Store in a dry environment at -20 to 40°C, with a shelf life of 24 months.
Documents
- Technical Data Sheet · PDF Download TDS
- SDS and COA · on request Request Documents
Frequently Asked Questions
What is the correct dosage of Manta WR-P02 in mortar or concrete?
Add WR-P02 at 0.4% to 0.5% by weight of cement, dry-blending the powder thoroughly with the cement, sand and aggregates before adding water, then proceed with standard placement and curing. In putty powders, tile grouts and pre-packaged waterproof cement, the dosage is 0.4% - 0.5% by total dry weight.
Can Manta WR-P02 be sprayed as a liquid anti-seepage treatment?
Yes. Dilute 1 part powder with 50 to 70 parts of clean water and spray it directly onto highly absorbent inorganic substrates such as concrete, fired bricks and roof tiles to create a moisture-proof barrier.
How is Manta WR-P02 used in leakage repair?
Mechanically profile smooth surfaces and plug active water leaks with a rapid-setting water-stop compound first. Then apply a slurry bond coat, followed immediately by mortar treated with WR-P02.
Related Products
WR-P02 is one step in the building protection formulation chain. One inquiry can cover the other raw materials in your formulation, with samples, technical documents, quotation and shipment handled together.
- Alkyl Silane Actives
- Emulsions & Pastes
- Siliconate Liquids & Powders
- Waterproof Coatings
Looking for a different purity, functional group, or a structure not listed here? Contact our technical team.
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