When continuously using 8MQP/5RQ halogen-free and lead-free high-temperature Solder Paste after opening, it was found that when left uncovered for 72 hours at room temperature 25°C and relative humidity 60%, it still maintains no obvious dry film on the squeegee edge and no clogging in stencil apertures. This is attributed to the synergistic effect of ROL0-level halogen control (<500ppm) and T4-grade 0307 alloy powder, which not only inhibits the oxidation rate of solder powder surface, but also maintains the stability of the Flux activity window, especially adapting to the stringent requirements of QFN/DFN devices for solder wetting height.

Compared with the actual performance of 8MNTTP/5RNTT series in communication module production lines, this Domestic Solder Paste achieves continuous operation for over 8 hours with a single loading without replenishing paste in laser jet valve dispensing, with solder ball occurrence rate below 0.03%. The matching of its 00507BN alloy powder with low-volatility rosin carrier stabilizes the post-reflow residue thickness at 0.8～1.2μm and completely transparent, avoiding optical inspection misjudgment, while conventional ROL1-level solder paste under the same working conditions shows slight edge whitening after 4 hours, and the clogging rate of stencil apertures below 25μm reaches 12% after 6 hours.

8M9P/5RR zero-halogen REACH compliant solder paste was verified in automotive LED headlight production lines, with void rate controlled within 3.2%, which is directly related to its 0ppm halogen content and the melting consistency of 305 alloy powder in the 235～255℃ soldering temperature range. Meanwhile, the T5-grade powder particle size distribution D50=15.3μm ensures that the thickness fluctuation of the solder joint intermetallic compound layer IMC is less than 0.35μm, reducing the batch-to-batch CV value by 27% compared with imported products of the same specification, making it particularly suitable for automotive application scenarios requiring thermal cycle life >5000 cycles.

Water-washable 8MW1P/5RW1 solder paste shows obvious advantages in lighting PCB rework. Its ORH1 type water-soluble flux can completely remove residues after cleaning with pure water at 50℃ for 30 seconds, and no silver migration signs are observed for SC07 alloy powder in the 240～260℃ reflow range, while traditional rosin-based solder paste requires isopropanol scrubbing and is accompanied by a 0.7% pad corrosion risk. This characteristic enables Domestic Solder paste to maintain the core process bottom line of SMT Solder Paste while balancing cost and environmental protection requirements.

To address the mounting difficulty of 01005 package devices on fingerprint lock motherboards, 8MNTTP/5RNTT paired with 00507B2N alloy powder was selected. In SPI inspection, the solder paste volume deviation has long been stable at ±4.6%, far better than the industry common ±7.2%. The key lies in the solid solution strengthening effect of nickel and bismuth elements in the tin matrix, which delays the viscosity increase rate of the solder paste after opening, making the viscosity change only 180Pa·s from the first opening to the 5th replenishment, while ordinary T3 powder solder paste changes by 420Pa·s in the same period. This difference directly translates to an increase in printing release yield from 92.3% to 99.1%.