We have validated three batches of JJY Domestic Solder Paste on the production line, with each batch delivered at a two-week interval. For the same model, continuous printing of 300 pieces without solder bridging was consistently achieved under a 0.08mm stencil aperture on the SMT printer. This is backed by hard specifications including the solder alloy powder particle size D50 controlled at 22±1.5μm and the rosin carrier softening point maintained at 68℃±2℃, rather than adjusting printing parameters to accommodate material fluctuations.

When new energy customers conduct sampling tests on BMS main control boards, the biggest concern is cold solder joints and missed soldering. We directly applied JJY SN96.5AG3.0CU0.5 Solder Paste on the machine, paired with a nitrogen-protected reflow oven. After maintaining a peak temperature of 235℃ for 65 seconds, X-ray spot checks showed the void rate at the bottom of QFN packages stably ranged from 8.3% to 9.1%, which is 1.7 percentage points lower than the previous generation of imported materials. Crucially, the measured deviation of metal content for each roll of solder paste is consistently kept within ±0.15%, avoiding sudden changes in wetting angle caused by silver content drift.

Medical electronics are extremely sensitive to ionic residues. A customer manufacturing patient monitor motherboards required Cl?＜0.5μg/cm2. We used JJY no-clean solder paste paired with Koh Young SPI equipment for online inspection, and found that the Flux activator formulation results in a residue conductivity naturally below 0.08mS/cm, allowing it to pass the IEC61191-2 Class 3 test without additional cleaning processes. Furthermore, after opening the can, the surface of the solder paste does not form a skin, and the viscosity recovery time after stirring is only 22 seconds, nearly twice as fast as conventional materials.

The most troublesome issue during the sampling and prototyping stage is frequent line changeovers. JJY solder paste has excellent compatibility on the JUKI FX3 placement machine, where printing can be completed with the same set of squeegee pressure parameters for components ranging from 0402 resistors to 8×8mm MOSFETs. Its viscosity attenuation rate after thermal cycling is only 4.6% within 72 hours, meaning parameters adjusted in the morning can still be used in the afternoon, eliminating the need to redo SPI first-article verification every time material is changed.

A customer asked whether prototyping of Mini LED backplanes with 0.2mm pitch was supported. We directly used JJY ultra-fine powder solder paste on a DEK Horizon, printing 0.15mm apertures with a 38μm laser-cut stencil. The result was a 99.3% SPI yield for 200 consecutive pieces, with bridging defects concentrated on the 17th and 83rd pieces. Root cause analysis revealed that stencil tension attenuation, rather than the solder paste, was the issue, which in turn proves that this solder paste still has sufficient cohesion and release capability under extreme aperture conditions.

The most practical feedback from the production line is that material changeover downtime has been compressed to under 110 seconds. This is because the batch number, smelting date, and factory inspection report for each can of JJY solder paste are laser-etched on the bottom of the can. Scanning the code immediately retrieves the original data, eliminating the need for manual verification of MSDS and TDS. This represents genuine efficiency for trial production lines that need to switch between more than five models per day.