# Thermal & Composite Fillers Source: https://powdchem.com/products/ceramic-powders/thermal-composite-fillers/ Page type: Material category Advanced ceramic powders Thermally conductive ceramic and composite filler powders. Select around the host matrix, loading, processing and final-part evaluation. [Browse 6 materials]() [Ask about supply]() [Image: Exploded thermal interface assembly with a heat sink, interface pad and electronic package]() ## Choose a material ### Spherical oxide fillers Choose alumina or silica, then the particle distribution and surface treatment needed by the resin and mixing process. #### Spherical alumina powder spherical alumina (Al2O3) thermally conductive filler powder [Selection guide]() [Ask about this material]() Al2O3 #### Spherical silica powder spherical silica (SiO2) thermally conductive filler powder [Selection guide]() [Ask about this material]() SiO2 ### Boron nitride fillers Separate agglomerated and platelet BN requirements. Describe the mixing and forming process when comparing particle shape and surface treatment. #### Agglomerated boron nitride powder agglomerated boron nitride powder (BN) thermal-interface filler [Selection guide]() [Ask about this material]() BN #### Platelet boron nitride powder Platelet boron nitride (BN) thermal-interface filler powder [Selection guide]() [Ask about this material]() BN ### Treated and coated fillers Identify the core and treatment or coating. Compare compatibility in the intended resin; a powder result does not establish the performance of the final composite. #### Surface-treated aluminum nitride powder Surface-treated aluminum nitride (AlN) thermal-interface filler powder [Selection guide]() [Ask about this material]() AlN core + surface treatment #### Alumina-coated filler powder alumina-coated composite filler powder (core and coating grade-specific) [Selection guide]() [Ask about this material]() Al2O3 coating + specified core ## Material selection guide Start with the material identity and process, then check the details on the proposed datasheet. **Material & surface** Compare BN, AlN and other filler systems by chemistry, morphology and treatment. A coating or surface treatment needs its own description. **Packing & rheology** Specify the particle-size blend, shape and target loading. Flow, dispersion and final-part properties must be considered together. **Evaluation basis** Distinguish powder properties from composite properties. Request the test method, matrix, loading and specimen conditions behind performance data. ## Before you choose **Does powder thermal conductivity predict a finished composite?** It does not establish the final formulation result. Interface quality, packing, dispersion, loading and processing all need to be considered in a representative sample. **What does this directory cover?** Raw nitrides remain in the nitride directory; this page focuses on filler morphology, treatment and formulation requirements. ## What to include in your request A material name or reference datasheet is enough to start. Add any requirements you already know. - Filler chemistry and surface treatment - Particle distribution, shape and size blend - Host matrix, loading and mixing/curing route - Composite test method and target conditions ### Quantity, samples and documents Nike has no fixed minimum order. Tell us the quantity you need; we’ll check supplier pack sizes and any minimums. We’ll check the proposed grade, sample options, delivery timing and available batch documents. Include any essential COA, TDS or SDS requirements. [How we coordinate documents]() [Samples and testing]() [Send a material request]() ## Applications to explore. [**Thermal & Functional Fillers**Filler powder sourcing for polymers, coatings and electronic packaging, centered on the matrix and the final formulation.]() [**Electronics & Semiconductor Materials**Specialty compound, high-purity oxide and functional powder sourcing for electronic and optoelectronic material development.]() ## Related material families. [**Nitride Powders**10 material directions]() [**Electronic & Functional Ceramics**17 material directions]() [**Functional Pigments**7 material directions]()