ALPHA WS-698 Paste Flux is a water-soluble, halogen-free flux designed for soldering lead-free and tin-lead eutectic alloys onto area array packages such as BGA, CSP, and Flip Chip. It is supplied in 150g cartridges and 30g syringes, with a viscosity of 250 to 550 Poise at 10rpm and a tack strength exceeding 140 gF. It meets IPC-J-STD-004 ORH0 activity level, passes copper corrosion and SIR tests (≥1.9×10¹⁰ Ω at 85 °C/85% RH), and is cleaned effectively with deionized water at 55-60 °C. Recommended for use in nitrogen atmospheres with ≤100 ppm oxygen, and stored at 15-25 °C with a 6-month shelf life.
Product Overview
ALPHA WS-698 water-soluble flux is engineered for soldering a variety of lead-free and tin-lead eutectic alloys onto area array packages. The flux is highly compatible with Copper Organic Solderability Preservative (Cu-OSP), electrolytic Nickel-Gold (Ni-Au), and Electroless Nickel/Immersion Copper (ENIG) pad finishes. ALPHA WS-698 is a halogen-free, compliant material with high fluxing activity, delivering performance advantages in wetting, spread, and missing ball rate/yield.
Product Features
Excellent Soldering
Excellent activity enables strong soldering to ENIG and Cu OSP finishes.
Wetting Performance
Superior wetting maximizes assembly yields, providing the highest ball attach and flip chip yield rates.
Cleaning Strength
Excellent cleanability, with residues easily removed using deionized water.
Featured Applications
Pin Transfer
Precision Application: The flux’s high activity and stable viscosity ensure precise, consistent application, crucial for accurate pin transfer.
Flip Chip / Ball Dip
Material Stability: Maintains tack and viscosity across multiple print cycles, ensuring consistent performance without frequent replenishment.
Printing
Using ALPHA® WS-698 Flux in printing applications ensures high-quality, reliable solder joints, which are vital for semiconductor performance and longevity.
| MacDermid Alpha Electronics Solutions | |
|---|---|
| Product Category | Filler Alloys and Consumables |
| Product Number | ALPHA ® WS-698 Flux |
| Product Name | Semiconductor Solder Flux for Packaging |
| Solder Alloy | Tin-Lead Alloy Solder (SN-Pb); Lead Free |
