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CAS Number: Not applicable (proprietary formulation; active ingredient: alkyl alkoxy silane)
Product Code: BRB Siloen MXP5
Manufacturer: BRB International B.V.
Synonyms:
Siloen MXP5; BRB Siloen MXP5; Water repellent powder; Alkyl alkoxy silane powder; Hydrophobic additive for mortars; Silane-based water repellent; Cementitious mortar additive
Chemical Identity and Properties:
BRB Siloen MXP5 is a high-performance water repellent additive in powder form, specifically formulated for cementitious dry mix formulations. The active ingredient is an alkyl alkoxy silane, which is chemically bonded to a solid carrier to create a free-flowing powder. When incorporated into cement-based materials, the silane reacts with the alkaline environment to provide durable hydrophobic properties.
Key Characteristics:
Active Ingredient: Alkyl alkoxy silane (approximately 20–30%, typical for such products)
Appearance: Free-flowing fine white powder
Bulk Density: Approximately 400 g/L
pH (10% water solution): Approximately 7.5
Active Ingredient Type: Alkyl alkoxy silane
Formulation: Powder form for dry mix incorporation
Mechanism of Action:
In the alkaline environment of cementitious materials (pH 10–12), the alkyl alkoxy silane undergoes hydrolysis and condensation reactions:
Hydrolysis: Alkoxy groups (-OR) are hydrolyzed to silanol groups (-Si-OH)
Condensation: Silanol groups react with hydroxyl groups on the cement matrix, forming stable covalent bonds (Si-O-Si or Si-O-Ca)
Hydrophobic Effect: The alkyl chains orient outward from the surface, creating a hydrophobic barrier that repels liquid water while allowing water vapor transmission (breathable)
Applications:
Primary Application:
BRB Siloen MXP5 is designed for cementitious dry mix formulations including:
Mortars: Plastering mortars, rendering mortars, repair mortars
Joint fillers: Grouts, tile adhesives, and joint compounds
Premixed plasters: Interior and exterior plasters
Renders: Decorative and protective renders
Sealing mortar slurries: Waterproofing slurries for concrete and masonry
Cement-based waterproofing systems
Performance Benefits:
Significant water uptake reduction: Prevents capillary water absorption
Long-lasting performance: More durable than stearate-based water repellents
Freeze-thaw resistance: Protects against freeze-thaw damage and de-icing salt stress
Linear dosage efficiency: Predictable performance based on dosage
Easy to use: Powder form allows simple dry blending
Non-toxic: Safe for handling and application
Free-flowing: Provides anti-caking properties to dry mixes
Compatibility: Excellent compatibility with other chemical additives (plasticizers, retarders, accelerators, etc.)
Rheology: No negative impact on rheological performance of material mixes
Storage stability: Stable in sealed bags
Typical Dosage:
Standard dosage: 0.2–0.5% w/w (dry basis) depending on desired water repellent performance
Higher dosage: Exceeding 1.0% may have minimal impact on compression strength (negligible effect)
Important Considerations:
Compatibility with water-retaining agents: Presence of additives based on water-retaining chemicals (e.g., methylcellulose, HPMC) may reduce the water repellent effect, requiring higher dosage
Application pH: Best efficiency in alkaline medium with pH 10–12 (typical for cementitious materials)
Mixing Instructions:
Dry blending: Mix BRB Siloen MXP5 with other dry components in any standard mixer used for producing finished powder products
Water addition: Add the dry mix containing BRB Siloen MXP5 to the required amount of water under stirring
Agitation: Maintain agitation for approximately 5 minutes to achieve homogeneous dispersion
Mixing considerations:
Too intensive machine stirring may lead to unwanted air entrapment
For hand mixing (lower shear force), stir, allow the mix to mature for a few minutes, and stir again
Hydrophobic effect: Water repellent properties become apparent when the mixes are totally dry
SAFETY INFORMATION ABOUT BRB SILOEN MXP5
First aid measures:
Description of first aid measures:
General advice:
Consult a physician.
Show this safety data sheet to the doctor in attendance.
Move out of dangerous area:
If inhaled:
If breathed in, move person into fresh air.
If not breathing, give artificial respiration.
Consult a physician.
In case of skin contact:
Take off contaminated clothing and shoes immediately.
Wash off with soap and plenty of water.
Consult a physician.
In case of eye contact:
Rinse thoroughly with plenty of water for at least 15 minutes and consult a physician.
Continue rinsing eyes during transport to hospital.
If swallowed:
Do NOT induce vomiting.
Never give anything by mouth to an unconscious person.
Rinse mouth with water.
Consult a physician.
Firefighting measures:
Extinguishing media:
Suitable extinguishing media:
Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
Special hazards arising from the substance or mixture
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas
Advice for firefighters:
Wear self-contained breathing apparatus for firefighting if necessary.
Accidental release measures:
Personal precautions, protective equipment and emergency procedures
Use personal protective equipment.
Avoid breathing vapours, mist or gas.
Evacuate personnel to safe areas.
Environmental precautions:
Prevent further leakage or spillage if safe to do so.
Do not let product enter drains.
Discharge into the environment must be avoided.
Methods and materials for containment and cleaning up:
Soak up with inert absorbent material and dispose of as hazardous waste.
Keep in suitable, closed containers for disposal.
Handling and storage:
Precautions for safe handling:
Avoid inhalation of vapour or mist.
Conditions for safe storage, including any incompatibilities:
Keep container tightly closed in a dry and well-ventilated place.
Containers which are opened must be carefully resealed and kept upright to prevent leakage.
Storage class (TRGS 510): 8A: Combustible, corrosive hazardous materials
Exposure controls/personal protection:
Control parameters:
Components with workplace control parameters
Contains no substances with occupational exposure limit values.
Exposure controls:
Appropriate engineering controls:
Handle in accordance with good industrial hygiene and safety practice.
Wash hands before breaks and at the end of workday.
Personal protective equipment:
Eye/face protection:
Tightly fitting safety goggles.
Faceshield (8-inch minimum).
Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).
Skin protection:
Handle with gloves.
Gloves must be inspected prior to use.
Use proper glove
removal technique (without touching glove's outer surface) to avoid skin contact with this product.
Dispose of contaminated gloves after use in accordance with applicable laws and good laboratory practices.
Wash and dry hands.
Full contact:
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
Splash contact
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
It should not be construed as offering an approval for any specific use scenario.
Body Protection:
Complete suit protecting against chemicals, The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace.
Respiratory protection:
Where risk assessment shows air-purifying respirators are appropriate use a fullface respirator with multi-purpose combination (US) or type ABEK (EN 14387) respirator cartridges as a backup to engineering controls.
If the respirator is the sole means of protection, use a full-face supplied air respirator.
Use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU).
Control of environmental exposure
Prevent further leakage or spillage if safe to do so.
Do not let product enter drains.
Discharge into the environment must be avoided.
Stability and reactivity:
Chemical stability:
Stable under recommended storage conditions.
Incompatible materials:
Strong oxidizing agents:
Hazardous decomposition products:
Hazardous decomposition products formed under fire conditions.
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas.
Disposal considerations:
Waste treatment methods:
Product:
Offer surplus and non-recyclable solutions to a licensed disposal company.
Contact a licensed professional waste disposal service to dispose of this material.
Contaminated packaging:
Dispose of as unused product
