Silicone Hydrophobic Powder (SHP): A High-Performance Water Repellent Solution for Dry Mix Mortar

With increasing requirements for durability and long-term protection in modern construction, moisture resistance has become a critical performance factor.
Silicone Hydrophobic Powder (SHP) is widely used as a water repellent powder for cement-based materials, helping to improve waterproof performance without compromising breathability.

As a functional hydrophobic additive for construction, SHP is increasingly adopted in dry mix mortar systems, rendering mortars, and exterior wall applications.

What is Silicone Hydrophobic Powder?

Silicone Hydrophobic Powder (SHP) is a free-flowing powder form of silicone-based water repellent agents. It is specifically designed for dry mix mortar and cementitious formulations.

When mixed into cement-based materials, Silicone Waterproofing Powder distributes evenly and forms hydrophobic groups within the mortar matrix. This significantly reduces capillary water absorption while maintaining vapor permeability.

Key Performance Benefits of SHP for Dry Mix Mortar

Excellent Water Repellency

SHP effectively reduces water penetration by blocking capillary absorption channels in cement-based materials.
This makes it a reliable water repellent powder for cement in exterior wall systems.

Long-Term Durability

Unlike surface coatings, Silicone Hydrophobic Powder works internally within the mortar structure.
This ensures durable water resistance even after surface wear.

Maintains Breathability

A major advantage of hydrophobic additive for construction based on silicone technology is that it does not seal the surface completely.
Moisture vapor can still escape, preventing internal condensation.

Easy Integration into Dry Mix Systems

As a dry powder, SHP can be directly blended into:

• Rendering mortar

• Masonry mortar

• Tile adhesive

• Skim coat

• Exterior insulation finishing systems

It is compatible with common additives such as:

• PCE Powder

• HPMC

• Redispersible Polymer Powder

Typical Applications of Silicone Waterproofing Powder

Silicone Hydrophobic Powder is widely used in:

• Exterior wall plaster

• Cement-based waterproof mortar

• EIFS systems

• Tile grout

• Repair mortar

In regions with high humidity and heavy rainfall, SHP helps extend building service life and reduce maintenance costs.

Technical Advantages in Cement-Based Systems

When added at recommended dosage, SHP for Dry Mix Mortar can:

• Reduce water absorption significantly

• Improve freeze–thaw resistance

• Enhance resistance to efflorescence

• Maintain mechanical strength

Because the hydrophobic effect occurs inside the matrix, performance remains stable even under harsh weather conditions.

Market Trend: Growing Demand for Internal Waterproofing Additives

With stricter building standards and higher expectations for façade durability, demand for Silicone Waterproofing Powder continues to grow globally.

Compared with liquid waterproofing agents, powder-form SHP offers:

• Easier transportation

• Better storage stability

• Simplified dry mix production

This makes Silicone Hydrophobic Powder a preferred solution for modern mortar manufacturers.

About Us

As a professional construction chemical manufacturer, we supply stable-quality:

• Silicone Hydrophobic Powder

• SHP for Dry Mix Mortar

• Water Repellent Powder for Cement Systems

We provide:

• Technical formulation support

• Customized dosage recommendations

• Free samples for laboratory testing

• Integrated additive solutions

If you are looking for a reliable hydrophobic additive for construction, our team is ready to support your formulation development.

Samples and technical solutions are available upon request.