Why platelets are considered
Fibres can strongly reinforce along their flow orientation. Platelet fillers offer a different morphology and may provide a more balanced reinforcement response in selected geometries. Glass flake can also restrict polymer-chain movement and alter dimensional change during cooling.
The outcome must be measured on the moulded part. Gate location, flow length, thickness transitions and cooling can dominate the orientation pattern and therefore warpage.
Surface treatment and dispersion
A compatible sizing or silane treatment can improve wet-out and the polymer-filler interface. Evaluate it with the specific resin grade, coupling agent and compounding sequence. A treatment that works in one thermoplastic cannot be assumed to transfer to another.
Use microscopy, melt-flow/rheology checks and mechanical testing to distinguish dispersion benefits from apparent changes caused by processing conditions.
A practical qualification plan
Compound a controlled series with unfilled polymer, current filler package and several glass-flake volume fractions. Keep drying, screw profile, temperature and moulding conditions under control. Test shrinkage in flow and transverse directions, warpage, tensile/flexural response, impact performance and relevant thermal properties.
For visible parts, also examine weld lines, surface appearance and coating/printing adhesion. Finer particles can help surface finish, while higher surface area may raise viscosity and processing energy.
Use data to choose the trade-off
The best grade and loading are application-specific. Choose the combination that meets dimensional stability and stiffness targets while preserving cycle time, impact requirement, surface quality and economics.
Engineering review checklist
- Define the part geometry, gate strategy and dimensional tolerance before filler selection.
- Compare results at equal volume fraction with controlled moulding conditions.
- Check both flow and cross-flow shrinkage plus part-level warpage.
- Confirm long-term properties after thermal or environmental aging where relevant.
Technical basis
Use supplier data as formulation inputs, then validate the finished system under the relevant service and application conditions.
Share the resin, target film thickness, application method, and service exposure to receive a grade recommendation.
Contact technical team →