Filler (Silica): SiO2 Content ≥ 99.8%, Loss on Drying ≤ 1.5%

Component Specifications

Definition

Fumed or precipitated silica used as a reinforcing filler in powder silicone resin formulations to improve mechanical strength, thixotropy, and anti-caking properties. It is a high-purity amorphous silicon dioxide with controlled particle size and surface treatment.

Working Principle

Silica particles disperse in the resin matrix, forming hydrogen bonds with polymer chains, increasing viscosity and providing structural reinforcement. Surface silanol groups interact with resin functional groups, enhancing crosslinking density.

Materials

Amorphous silicon dioxide (SiO2), fumed or precipitated, with specific surface area 150-400 m²/g, primary particle size 7-40 nm, and surface treatment (e.g., hydrophobic with silanes).

Technical Parameters

Parameter	Typical range	Notes & selection driver
SiO2 Content	≥ 99.8%
Loss On Drying	≤ 1.5%
Tapped Density	50-80 g/L
PH (5% Slurry)	3.5-4.5
Specific Surface Area (BET)	200 ± 25 m²/g

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

Standards

ISO 3262-20, ASTM D6738

Parent Products

This component is used in the following industrial products

Powder Silicone Resin

A solid, powdered form of silicone resin used as a high-performance coating, adhesive, or additive material.

View Product Details

Engineering Analysis

Risks & Mitigation

Respiratory irritation if inhaled as dust
Potential for agglomeration if not properly dispersed

FMEA Triads

Trigger: Insufficient dispersion
Failure: Poor mechanical properties and surface defects
Mitigation: Use high-shear mixing and optimize mixing time

Trigger: Moisture absorption
Failure: Reduced reinforcement and caking
Mitigation: Store in sealed containers with desiccant

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±5% on specific surface area

Test Method

BET nitrogen adsorption (ISO 9277)

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

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Filler (Silica)

Manufacturer profiles associated with Filler (Silica).

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

Related Components

Mold Release Coating

Specialized coating applied to molds to facilitate easy release of silicone seal rings during manufacturing.

Silicone Polymer Base

Silicone polymer base is a high-temperature resistant polymer material used as the foundational component in silicone rubber compounds for industrial applications.

Reinforcing Filler

Reinforcing filler is a material added to silicone rubber compounds to enhance mechanical properties, thermal stability, and durability in high-temperature applications.

Processing Aids

Processing aids are specialized additives used to improve the manufacturability and performance of high-temperature silicone rubber compounds during industrial processing.

Frequently Asked Questions

What is the typical loading of silica filler in silicone resin?

Typically 5-30% by weight, depending on desired viscosity and mechanical properties.

Can hydrophobic silica be used in water-based systems?

No, hydrophobic silica is designed for non-polar systems; hydrophilic silica is used in water-based formulations.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Filler (Silica)