Ceramic Microspheres GP 400

Ceramic Microspheres GP-400

GP-400 Grey Ceramic Microspheres are medium-fine, high-strength alumino-silicate ceramic microspheres developed for demanding construction and cementitious applications where a balance of mechanical reinforcement, thickness build, and dimensional stability is required. Compared to finer grades, GP-400 offers higher volume build and improved crack resistance, making it suitable for repair mortars, grouts, industrial flooring, overlays, and cement-based protective systems.

GP-400 functions as a rigid ceramic micro-aggregate, improving load distribution, abrasion resistance, and structural integrity while maintaining workable rheology in both dry-mix and wet-mix construction formulations.

General Characteristics

Synonyms

Ceramic microspheres, Cenospheres, Solid alumino-silicate microspheres

Chemical family / description

Naturally derived hollow alumino-silicate ceramic spheres (lightweight inorganic filler)

Molecular weight

Not applicable (mineral mixture)

Appearance

Light to dark grey color powder

Particle shape

Spherical

Specific Gravity

2.25-2.40 gm/cc

CAS No.

12141-46-7

EC / EINECS

Not single-substance (varies by source / classification)

HS Code.

2621.90.00

UN / Transport

Not regulated (non-hazardous inorganic powder)

Applications in Construction

Cementitious Repair Mortars

Structural and non-structural repair mortars
Polymer-modified repair compounds
High-build patching and resurfacing systems

Grouts & Anchoring Systems

Non-shrink cementitious grouts
Base-plate and machine-foundation grouts
Structural anchoring and void filling

Industrial Flooring & Screeds

Cementitious and epoxy-cement flooring systems
Self-levelling underlayments
Heavy-traffic industrial and warehouse floors

Concrete Overlays & Toppings

Thin and medium-thickness overlays
Polymer-modified screeds
Wear-resistant surface toppings

Cementitious Coatings

Protective cement coatings
Waterproofing and barrier coatings
Levelling and smoothing compounds

Typical Specifications (GP-400)

Property	Typical Value
Chemical Composition	Alumino-Silicate Ceramic
Color	Grey
Particle Morphology	Spherical
Structure	Dense / High-Strength
Median Particle Size (D50)	Medium-fine grade
True Density	~2.4 g/cc
Bulk Density	~1.3 – 1.6 g/cc
Crush Strength	High (construction grade)
Mohs Hardness	~6 – 7
pH (slurry)	Neutral to mildly alkaline
Thermal Stability	> 1,000 °C
Form	Free-flowing powder

Benefits

Enhanced compressive strength and load capacity

Improves structural performance in mortars, grouts, and flooring systems.

Improved thickness build and crack resistance

Medium-fine particles support higher build without excessive shrinkage or cracking.

Superior abrasion and wear resistance

Ceramic hardness improves durability in high-traffic and industrial areas.

Improved dimensional stability

Reduces shrinkage-related defects and improves long-term shape retention.

Balanced rheology and workability

Spherical particle geometry improves packing efficiency and mixing consistency.

Improved durability in harsh environments

Inert ceramic chemistry resists moisture, alkalis, and construction chemicals.

Safety and Hazards

GP-400 Grey Ceramic Microspheres are inorganic, non-toxic, and chemically inert under normal construction material handling conditions.

Non-flammable and non-reactive

Does not emit hazardous fumes

Dust generation should be minimized

Recommended PPE

Safety goggles
Gloves
Dust mask or respirator in dusty environments

Refer to the Safety Data Sheet (SDS) for detailed handling and occupational safety guidance.

Storage

Store in a dry, cool, and well-ventilated area

Protect from moisture and humidity

Keep bags tightly sealed after opening

Avoid mechanical damage to packaging

Proper storage ensures product flowability and consistent performance.

Packaging Information

Standard Packing

25 kg HDPE-lined paper bags

Optional Packing

Jumbo / bulk bags
Customized packaging on request

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