Silicone Micropowders: Specifications and Industrial Uses

Product Specifications

Technical details and manufacturing context for Silicone Micropowders

Definition

Silicone micropowders are engineered particulate materials composed primarily of silicone polymers or silicone-modified compounds, manufactured through specialized processes to achieve specific particle size distributions, surface properties, and functional characteristics. These materials are designed to provide controlled rheological modification, surface enhancement, and performance improvement in various industrial formulations and composites.

Typical parameters for these micropowders include a median particle size (D50) of 15–60 μm, with a particle size distribution ratio (D90/D10) of ≤5, as measured by laser diffraction (ISO 13320). Specific surface area ranges from 1.5 to 3.5 m²/g (ISO 9277), and bulk density is between 0.15 and 0.35 g/cm³ (ISO 23145). Moisture content is ≤0.5% (ISO 787-2), pH value in aqueous suspension is 6.5–8.5 (ISO 787-9), and purity (SiO₂ content) is ≥99.5% (GB/T 21236). Oil absorption is 20–40 g/100g (ISO 787-5), whiteness is ≥90% (GB/T 5950), loss on ignition is ≤0.5% (ISO 3262-1), electrical conductivity is ≤10 μS/cm (ISO 7888), and thermal stability indicates decomposition above 400°C (ISO 11358).

These micropowders function through their particulate nature and surface chemistry. The fine particles disperse within matrices to modify rheological properties, provide reinforcement, or impart specific surface characteristics. Their effectiveness depends on particle size distribution, surface area, surface treatment, and compatibility with host materials, enabling controlled interaction at microscopic interfaces.

When selecting silicone micropowders, consider the required particle size distribution, surface area, and compatibility with the host matrix. Verify model-specific values and standards with the legal manufacturer or supplier, as the listed parameters are reference ranges for directory purposes. Maintenance signals include changes in dispersion behavior or performance, which may indicate particle agglomeration or degradation. Failure boundaries include exceeding thermal stability limits or incompatibility with the matrix.

For procurement, confirm that the product meets the required specifications and standards for your application. The listed standards are verification references, not proof of certification or compliance.

Working Principle

Silicone micropowders operate based on their particulate nature and surface chemistry. The fine particles disperse within a matrix, modifying rheological properties, providing reinforcement, or imparting surface characteristics. Their effectiveness depends on particle size distribution, surface area, surface treatment, and compatibility with host materials. The particles interact at microscopic interfaces, enabling controlled modification of the final product's properties. For example, in coatings, they can affect flow and leveling; in composites, they can enhance mechanical strength or thermal stability. The specific surface area and particle size distribution determine the extent of interaction, while surface treatment agents can improve dispersion and compatibility.

Common Materials

Polydimethylsiloxane, Silica, Surface treatment agents

Technical Parameters

Parameter	Typical range	Notes & selection driver
Particle Size D50Required	15–60 μm	Median particle diameter where 50% of particles are smaller and 50% are largerISO 13320
Particle Size DistributionRequired	D90/D10 ≤ 5 μm	Range of particle sizes typically expressed as D10, D50, D90 valuesISO 13320
Specific Surface AreaRequired	1.5–3.5 m²/g	Total surface area per unit mass of powderISO 9277
Bulk DensityRequired	0.15–0.35 g/cm³	Mass per unit volume of loosely packed powderISO 23145
Moisture Content	≤ 0.5 %	Percentage of water content in the powderISO 787-2
pH Value	6.5–8.5 pH	Acidity or alkalinity of aqueous suspensionISO 787-9
Purity (SiO₂ Content)	≥ 99.5 %	High purity for electronic applicationsGB/T 21236
Oil Absorption	20–40 g/100g	Affects rheology in coatingsISO 787-5
Whiteness	≥ 90 %	Important for light-colored productsGB/T 5950
Loss on Ignition	≤ 0.5 %	Indicates organic impuritiesISO 3262-1
Electrical Conductivity	≤ 10 μS/cm	Low conductivity for insulationISO 7888
Thermal Stability	≤ 400 °C	Decomposition above 400°CISO 11358

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Silicone Polymer Core Part
Primary structural component providing silicone properties and chemical resistance

Material: Polydimethylsiloxane or modified silicone polymers
Surface Treatment Layer Part
Modifies surface properties for improved compatibility and dispersion in various matrices

Material: Silanes, siloxanes, or other surface modification agents
Filler Material Part
Provides reinforcement, modifies density, or enhances specific properties

Material: Silica, calcium carbonate, or other mineral fillers
Additive Package Part
Provides additional functionality such as anti-caking, flow enhancement, or stabilization

Material: Flow agents, anti-static agents, or stabilizers

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Silicone Micropowders.

Manufacturers of Silicone Micropowders

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

SILIBASE SILICONE

Zhejiang, CN

Also makes: Silicone Resin, Powder Silicone Resin, Silicone Rubber

Listed on the company's own website · profile compiled by CNFX from public sources

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Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

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Frequently Asked Questions

What are typical particle size specifications for silicone micropowders?

Typical specifications include a median particle size (D50) of 15–60 μm and a particle size distribution ratio (D90/D10) of ≤5, measured by laser diffraction according to ISO 13320. These values are reference ranges; confirm the exact specifications for your intended application with the manufacturer.

How do silicone micropowders affect rheological properties?

Silicone micropowders modify rheological properties by dispersing as fine particles in a matrix, increasing viscosity or altering flow behavior. The effect depends on particle size, surface area, and surface treatment. For example, in coatings, they can improve sag resistance or leveling. Verify performance with the supplier for your specific formulation.

What standards are relevant for verifying silicone micropowder quality?

Relevant standards include ISO 13320 for particle size distribution, ISO 9277 for specific surface area, ISO 23145 for bulk density, and ISO 787 series for moisture, pH, oil absorption, and other properties. These standards serve as verification references; ensure the product meets your requirements by consulting the manufacturer.

What are the limitations or failure boundaries of silicone micropowders?

Silicone micropowders have a thermal stability limit, with decomposition occurring above 400°C. They may also be incompatible with certain matrices, to poor dispersion or performance. Additionally, moisture content above 0.5% could affect properties. Always test under your processing conditions and consult the supplier for guidance.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric to 10 bar
temperature:	-50°C to 250°C
particle size range:	1-100 microns

Silicone Micropowders

Product Specifications

Industry Taxonomies & Aliases

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards