Water is the single most destructive force acting on building materials. Rain penetration, rising damp, freeze-thaw cycling, and efflorescence all trace back to the same root cause: capillary water absorption in mortar, plaster, and grout. Traditional approaches — liquid water repellents applied post-curing or integral waterproofing liquids added at the mixer — have limitations in modern dry-mix mortar production.
Pó hidrofóbico de silicone solves this problem at the manufacturing stage. As a free-flowing powder additive based on silicone compounds, it integrates directly into dry-mix formulations and provides durable, internal water repellency after curing — without requiring special liquid dosing equipment.
This guide covers Michem’s verified Silicone Hydrophobic Powder specifications, mechanism of action, dosage guidance, and application areas — all data sourced from the Michem product page.
According to the Michem product page, Silicone Hydrophobic Powder is:
“A free-flowing powder additive based on silicone compounds and specially processed carriers. It is designed to be easily mixed into dry powder formulations and, once added to cement- or gypsum-based systems, provides excellent hydrophobic properties after curing.”
The key distinction from liquid water repellents is the powder format. In dry-mix mortar production — where all ingredients are pre-blended at the factory and only water is added on site — a powder additive is essential. Liquid water repellents cannot be pre-mixed into dry formulations without special equipment and stability concerns.
Todos os dados a seguir foram extraídos diretamente do Michem product page.
| Item | Especificação padrão |
|---|---|
| Aparência | Pó branco ou esbranquiçado de fluxo livre |
| Ingrediente ativo | Composto hidrofóbico à base de silicone |
| Densidade a granel | Aprox. 300-600 g/L |
| Teor de umidade | ≤ 5% |
| Valor do pH | Neutro a fracamente alcalino |
| Solubilidade / Dispersão | Dispersível em sistemas de mistura seca |
| Dosagem recomendada | 0,1%-1,0% |
| Aplicativo | Argamassa, gesso, rejunte, massa de vidraceiro, sistemas à prova d'água |
Fonte: michemicals.com
The product page includes an explicit caution:
“The exact dosage should be determined through laboratory and production testing according to raw materials, target water repellency, and formula design.”
This means the 0.1–1.0% range is a starting point, not a fixed recommendation. The optimal dosage depends on:
The Michem product page provides a clear explanation of the mechanism:
The powder is evenly dispersed throughout the dry-mix formulation during factory blending. Because it is a free-flowing powder, it mixes uniformly with cement, sand, and other dry additives without clumping or segregation.
“After being evenly dispersed in the dry mix formula and mixed with water on site, Silicone Hydrophobic Powder becomes integrated into the mortar or plaster matrix.”
When the dry mix is combined with water on site, the silicone hydrophobic component is released from its carrier and begins to disperse throughout the wet mortar.
“During curing, the active silicone component distributes through the capillary network and forms a hydrophobic barrier on internal pore surfaces.”
As the mortar cures, the active silicone compound migrates through the capillary pore structure of the hardened material. It bonds to the pore surfaces, creating a water-repellent molecular film.
The product page explains the molecular mechanism:
“Silicone hydrophobic powder forms a low-surface-energy, water-repellent molecular film on substrates through siloxane bonding, effectively repelling liquid water by reducing surface wettability.”
Siloxane bonds (Si-O-Si) are chemically stable and durable. Unlike surface-applied water repellents that can wear off or degrade, the internal hydrophobic barrier formed by silicone hydrophobic powder is integrated into the material structure, providing long-term water repellency.
“Because it works within the material structure rather than only on the surface, it can provide durable internal water repellency.”
This is a critical distinction. Surface treatments (spray-on water repellents) protect only the outer layer. If the surface is damaged, worn, or cracked, water penetration resumes. Integral hydrophobic treatment with silicone powder protects the entire material volume.
The Michem product page identifies six key benefits of Silicone Hydrophobic Powder:
“The main benefit is its ability to significantly reduce water absorption in mortar, plaster, grout, and other building materials. This helps keep surfaces and structures drier over time.”
“By reducing water penetration, the product helps protect building materials from moisture-related damage such as freeze-thaw deterioration, efflorescence, cracking, and mold risk.”
“This additive is especially useful for exterior wall systems, façade mortars, insulation systems, and humid-area construction where water resistance is critical.”
“Because it is in powder form, the product can be directly incorporated into dry mix mortar formulations without requiring special liquid dosing equipment.”
“While improving hydrophobic performance, the product can still allow construction materials to retain reasonable vapor permeability, depending on the formula design.”
This is an important distinction from waterproof membranes. A completely impermeable barrier traps moisture inside the wall, leading to blistering and delamination. Silicone hydrophobic powder repels liquid water while allowing water vapor to escape — a “breathable” waterproofing approach.
“A relatively low dosage can deliver a clear improvement in water resistance, making Silicone Hydrophobic Powder a practical additive for higher-value mortar products.”
At 0.1–1.0% dosage, the cost impact on the total formulation is modest, while the performance improvement in water resistance is significant.
The Michem product page confirms six main application areas:
“In waterproof mortar formulations, Silicone Hydrophobic Powder helps reduce capillary water absorption and improve the overall waterproofing performance of the hardened material.”
This is the primary application — cement-based waterproofing mortars used in basements, water tanks, swimming pools, and below-grade structures.
“For exterior plaster and façade mortars, the product helps resist rainwater penetration and improve weather durability.”
Façade mortars are constantly exposed to wind-driven rain. Without hydrophobic treatment, the porous mortar absorbs water, leading to staining, efflorescence, and freeze-thaw damage in cold climates.
“In tile grout applications, it reduces water uptake and helps maintain grout durability in wet environments such as bathrooms, kitchens, and exterior tiled surfaces.”
Tile grout is particularly vulnerable to water absorption because of its high cement content and fine aggregate. Hydrophobic treatment prevents water from penetrating behind tiles, reducing the risk of mold growth and substrate damage.
“It can be used in wall finishing materials where moderate water repellency and moisture resistance are required.”
Wall putties and skim coats benefit from hydrophobic treatment to prevent moisture from penetrating through the finish layer into the substrate.
“In selected gypsum plasters and gypsum-based dry mix products, silicone hydrophobic powder helps reduce sensitivity to moisture and improve service performance.”
Gypsum is naturally more water-sensitive than cement. Hydrophobic powder helps gypsum products maintain performance in humid environments where they would otherwise soften and degrade.
“In external insulation finishing systems, this additive helps improve water resistance while supporting the durability of the façade system.”
EIFS systems are multi-layer assemblies where water penetration can cause insulation degradation and system failure. Hydrophobic treatment of the base coat and finish mortar provides critical protection.
The Michem product page provides a comparison explaining why powder-form hydrophobic additives are preferred for dry-mix applications:
| Fator | Pó hidrofóbico de silicone | Liquid Water Repellent |
|---|---|---|
| Dry-mix compatibility | Directly incorporated into dry formulations | Requires special liquid dosing equipment |
| Premixed system stability | Desempenho mais estável em sistemas de pó pré-misturado | May separate or degrade in storage |
| Production efficiency | No additional equipment needed | Requires liquid handling infrastructure |
| Factory application | Highly efficient choice for dry mortar factories | Less practical for premixed production |
“For dry mortar factories, this makes powder-type hydrophobic additives a highly efficient choice.”
Fonte: michemicals.com
The product page specifies a dosage range of 0,1%-1,0% of the total dry mix formulation. Based on the application areas described on the page, the following starting points are consistent with the product’s intended use:
| Aplicativo | Dose inicial | Fundamentação |
|---|---|---|
| Standard tile grout | 0,2-0,4% | Moderate water resistance for wet-area tiling |
| Exterior plaster / façade mortar | 0.3–0.5% | Higher resistance needed for wind-driven rain exposure |
| Argamassa à prova d'água | 0.5–1.0% | Maximum water absorption reduction for below-grade and water-contact applications |
| Wall putty | 0.1–0.3% | Moderate repellency sufficient for finishing layers |
| Gypsum products | 0.2–0.5% | Protects water-sensitive gypsum from humidity |
| EIFS base/finish coat | 0.3–0.6% | Critical for long-term façade system durability |
Importante: These starting points are based on the product’s stated dosage range (0.1–1.0%) and application descriptions from the product page. The exact dosage must be determined through laboratory testing with your specific raw materials and performance targets.
To determine the optimal dosage for your formulation:
The product page notes that Silicone Hydrophobic Powder is “dispersible in dry mix systems,” confirming its compatibility with standard dry-mix production. However, formulators should verify compatibility with:
As with any additive combination, laboratory testing is essential to confirm that all components perform as expected in the final formulation.
The product page identifies the target customer base:
“Whether you are a dry mix mortar factory, tile grout producer, wall putty manufacturer, waterproofing material distributor, or construction chemical importer”
A Michem fornece:
Silicone Hydrophobic Powder represents a practical, cost-effective approach to integral waterproofing in dry-mix mortar formulations. At just 0.1–1.0% dosage, it significantly reduces capillary water absorption, protects against moisture-related damage (efflorescence, freeze-thaw, mold), and maintains vapor permeability — all without requiring special liquid dosing equipment.
For manufacturers of waterproof mortar, façade plaster, tile grout, wall putty, gypsum products, or EIFS systems, Michem’s Silicone Hydrophobic Powder offers a proven additive solution backed by technical support, free samples, and comprehensive documentation.
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