Semiconductor Encapsulant Mixing and Degassing: Yield Is Won at the Batch Stage
A vacuum planetary centrifugal mixer is a blade-free mixing and degassing machine that spins sealed cups under 0.2 kPa vacuum to homogenize and de-air semiconductor encapsulants.
Semiconductor packaging is the last mile from wafer to device, and the quality of underfill, epoxy molding compound and conductive adhesives decides device reliability.
In encapsulant preparation, mixing and degassing is the first checkpoint in the yield battle.
Three Difficulties in Encapsulant Preparation
Encapsulant preparation has to clear three hurdles.
High-viscosity mixing is hard: thick, highly filled pastes leave dead zones in conventional stirrers, and filler settling drifts the batch away from the formula.
Microbubbles threaten reliability: trapped air becomes voids during curing and reflow, stressing the die and failing reliability tests.
Metal contamination is unacceptable: wear debris from blades can cause leakage current and device failure in impurity-sensitive materials.
A Process Framework That Works
1.Weigh and pre-wet.
Resin, hardener and fillers such as silica and alumina are weighed per formula and pre-mixed for wetting.
2.Centrifugal dispersion.
Run 1500–2000 rpm for 2–4 minutes so fillers stay uniformly suspended; the drive supports 200–2000 rpm for tuning.
3.Vacuum degassing.
Hold 0.2 kPa for 3–5 minutes to extract microbubbles completely.
4.Temperature control, optional.
Suppress mixing heat to widen the working window and delay early reaction of fast-curing systems.
Why SMIDA Fits Semiconductor Packaging
•Zero metal debris.
The blade-free design means material touches only the cup.
•Sealed vacuum mixing.
Prevents moisture pickup and bubble entrapment.
•Temperature-controlled models.
TTC series holds -15 °C to 25 °C for heat-sensitive systems.
•Fully digital recipes.
Parameters are stored per batch, supporting the traceability semiconductor lines demand.
•Certified and proven.
CE, ISO 9001, ISO 14001 and ISO 45001 certified, trusted by 2,000+ customers in 40+ countries.
Frequently Asked Questions
What is the mixing volume range?
From 1 g laboratory samples to 100 kg+ production batches, with equipment covering 150 g to 100 kg+.
The same platform scales from R&D to production.
Can it handle fast-curing systems?
Yes — temperature-controlled models suppress heat rise and extend the open time before cure.
Every percentage point of yield is real cost saved, and the yield tone is set at the batch stage.
Send your encapsulant to the SMIDA lab for a free sample test — we verify your process with vacuum and uniformity data.
