Indium 6.6HF SAC305 Lead-Free Solder Paste 600g | Water-Soluble | PASTEOT-801641-600G
Indium 6.6HF SAC305 Lead-Free Water-Soluble Solder Paste — 600g Cartridge | PASTEOT-801641-600G
Indium 6.6HF (part number PASTEOT-801641-600G) is a water-soluble SAC305 solder paste formulated for air or nitrogen reflow SMT assembly. Made with SAC305 alloy and a Type 4 powder (88.5% metal load), 6.6HF delivers exceptional stencil printing performance with long stencil life and excellent response-to-pause — critical for high-mix production lines with frequent stoppages. Industry-leading low-voiding performance for BGAs, CSPs, and QFNs. Residues must be cleaned after reflow using a water-wash cleaning process. Ships overnight only due to refrigeration requirements.
Minimum order: 5 cartridges. Ships overnight only (temperature-sensitive).
Specifications
| Part Number | PASTEOT-801641-600G |
|---|---|
| Product Line | Indium 6.6HF |
| Alloy | SAC305 (96.5Sn/3.0Ag/0.5Cu) — Lead-Free |
| Flux Type | Water-Soluble (water-wash required after reflow) |
| Powder Type | Type 4 (20–38 μm) |
| Metal Load | 88.5% |
| Reflow Atmosphere | Air or nitrogen |
| Container | 600g cartridge |
| Minimum Order Quantity | 5 cartridges |
| Cleaning Method | Water wash required after reflow |
| Shipping Requirement | Overnight only (temperature-sensitive, refrigerated) |
| Manufacturer | Indium Corporation |
Download Indium 6.6HF Technical Data Sheet (PDF)
Key Features
- Excellent response-to-pause — maintains printability during production stoppages; ideal for high-mix lines with frequent interruptions
- Industry-leading low voiding — minimizes voids under BGAs, CSPs, and QFNs for high-reliability assemblies
- Long stencil life — extended open time without paste degradation for long production runs
- Air or nitrogen reflow compatible — flexible process integration without requiring nitrogen atmosphere
- SAC305 lead-free alloy — RoHS-compliant, widely accepted for high-reliability lead-free production
- Type 4 powder (20–38μm) — fine-pitch capable, suitable for apertures down to ~0.4mm pitch
Industries & Applications
- Electronics manufacturing (EMS/OEM/CEM) — high-reliability SMT reflow requiring post-reflow cleaning
- Aerospace & defense electronics — IPC Class 3 assemblies where ionic cleanliness is critical
- Medical device manufacturing — high-reliability PCB assembly requiring validated cleaning processes
- Automotive electronics — lead-free production with stringent cleanliness and reliability requirements
- BGA/CSP/QFN-heavy assemblies — where low voiding is essential for thermal and electrical performance
Available 6.6HF Formats
| Part Number | Format | Size | MOQ | Notes |
|---|---|---|---|---|
| PASTEOT-801641-600G | Cartridge | 600g | 5 | SAC305, Type 4 — this listing |
| PASTEOT-801641-500G | Jar | 500g | — | SAC305, Type 4, jar format for stencil printing |
| PASTEOT-801643-600G | Cartridge | 600g | — | SAC305, Type 3 powder variant |
Frequently Asked Questions
Does Indium 6.6HF require cleaning after reflow?
Yes — 6.6HF is a water-soluble flux formulation. Residues must be removed after reflow using a water-wash cleaning system with deionized water. It is not a no-clean paste. Proper cleaning achieves the low ionic contamination levels required for high-reliability assemblies per IPC standards.
What is the difference between PASTEOT-801641 and PASTEOT-801642?
Both use the 6.6HF water-soluble flux system. PASTEOT-801641 is the lead-free SAC305 version; PASTEOT-801642 is the leaded Sn63/Pb37 version. Choose based on your process requirements and RoHS compliance needs.
What stencil aperture sizes work with Type 4 powder?
Type 4 powder (20–38 μm particle size) is suitable for apertures down to approximately 0.4mm pitch and area ratios of 0.66 or greater. For ultra-fine-pitch below 0.3mm, Type 5 or Type 6 powder should be considered.
Is 6.6HF compatible with nitrogen reflow, or is air sufficient?
6.6HF is formulated to perform in both air and nitrogen reflow atmospheres. Air reflow is sufficient for most applications. Nitrogen can be used to further reduce oxidation and improve wetting on challenging surface finishes, but is not required for typical SMT production.
Why does Indium solder paste require overnight shipping?
Solder paste is temperature-sensitive and must be stored and shipped refrigerated to maintain flux activity, viscosity, and shelf life. 6.6HF must be shipped overnight and received promptly. Store at 0–10°C upon receipt and allow to reach room temperature before use.
What is the minimum order quantity for PASTEOT-801641-600G?
The minimum order quantity is 5 cartridges (5 × 600g = 3,000g total). Contact MTE Solutions at 651.600.3838 or sales@mtesolutionsinc.com to confirm current availability and lead time.
Learn More:
