Recommended Toynol® and Vanconol® Formulations for Flux
## 1. Product Selection Overview
| Priority | Product Category | Core Products | Functional Positioning | Suitable Flux Types |
|—|—|—|—|
| **Class A** | Acetylenic alcohol / acetylenic diol series | FS-204E, Superwet-604, Superwet-320, FS-640 | Gemini nonionic; lowers surface tension, molecular-level defoaming, nonionic improves insulation resistance | Halogen-free no-clean solder wire flux (direct application in patent CN114289932A) |
| **Class B** | Low-foam surfactants | LFS-111, LFS-112, LFS-2501, LFS-1907 | Low dynamic surface tension, low foaming, easy rinsing; website explicitly lists electronic component cleaning | Electronics-grade high insulation resistance, precision soldering, high-speed spraying/showering |
| **Class C** | Auxiliary wetting / foam control | D-502A, BWA-925/930, FS-660, DF-80PG | Auxiliary wetting, salt/alkali resistance, long-lasting foam suppression | Wetting aid in compound formulations, salt-containing/alkaline systems |
—
## 2. Class A: Acetylenic Alcohol / Acetylenic Diol Series (Direct Patent Correspondence)
### 1. FS-204E (Corresponds to Example 1 of Patent CN114289932A)
– **Chemical name**: 2,4,7,9-Tetramethyl-5-decyne-4,7-diol (diluted to 50% with ethylene glycol)
– **Key performance**: Surface tension 37.8 mN/m (2 bubbles/s) → 39.3 mN/m (6 bubbles/s)
– **Patent reference**: Example 1 of CN114289932A directly uses a product of the same structure
– **Dosage**: 0.1-1.0% of the flux formulation (patent basis)
– **Dissolution process**: Predilute with an alcohol/ether solvent before adding to the molten rosin vehicle
### 2. Superwet-604 (Corresponds to Example 2 of Patent CN114289932A)
– **Chemical name**: Ethoxylated C12 acetylenic diol
– **Key performance**: Surface tension 33.3 mN/m (2 bubbles/s) → 38.2 mN/m (6 bubbles/s); no oiling out and no foaming
– **Patent reference**: Example 2 of CN114289932A is compounded with oleyl alcohol polyoxyethylene ether
– **Function**: Replaces fluorosurfactants; strong dynamic wetting, low foaming
### 3. Superwet-320
– **Key performance**: Lowest surface tension in the series (26.7 mN/m at 0.3% aqueous solution); low foaming + self-defoaming (25 s)
– **Application**: Spreading of lead-free solder where extremely high wetting is required
### 4. FS-640
– **Key performance**: Surface tension 27.2 mN/m at 0.5% aqueous solution; self-defoaming in 5 s; foam height 5 mL
– **Application**: Rapid suppression of solder wire spatter during soldering
—
## 3. Class B: Low-Foam Surfactants (Electronic Cleaning Background)
### 1. LFS-111 / LFS-112
– **Website application**: Explicitly listed for electronic component cleaning and industrial cleaning
– **Key performance**:
– LFS-111: static 26.8 mN/m, dynamic 28.2 mN/m; foam 3 mm, dissipates in 300 s
– LFS-112: static 25.6 mN/m, dynamic 27.6 mN/m; stronger wetting
– **Advantages**: Low foaming, easy rinsing, nonionic improves insulation resistance
– **Note**: LFS-112 has a cloud point of 36.5 ℃; above this temperature its function is lost
### 2. LFS-2501
– **Properties**: Strong alkali resistance (≥5% NaOH), cloud point ≥90 ℃, emulsification, penetration, dispersion
– **Application**: Alkaline activator systems or downstream high-temperature cleaning processes
### 3. LFS-1907
– **Properties**: Low dynamic surface tension, stable under high shear, low foaming
– **Application**: High-speed spraying or recirculating application scenarios
—
## 4. Dosage and Process Key Points
### Patent Dosage References
– **Halogen-free no-clean solder wire flux**: total surfactant 0.1-1.0% (CN114289932A)
– **Solder paste (acetylenic alcohol stabilizer)**: 0.005-0.5%, preferably 0.01% (CN105499828)
– **Water-soluble flux**: 0.5-2.0% (CN101992366A)
### Dissolution and Addition Sequence
1. **FS-204 series**: solid or high-concentration liquid; must be pre-dissolved in an alcohol/ether solvent
2. Molten rosin vehicle (155 ℃) → add activator → finally add the compounded solution containing the surfactant
3. Avoid prolonged high-temperature exposure that causes loss of activity
### Compounding Strategies
– **Example 1**: FS-204E used alone
– **Example 2**: Superwet-604 + oleyl alcohol polyoxyethylene ether compound
– **Recommended approach**: FS-204E (defoaming) + Superwet-604 (dynamic wetting) + LFS-111 (low foam / high insulation resistance) triple compound
—
## 5. Verification Items (Required for Lab Trials)
| Item | Test Method | Acceptance Criterion |
|—|—|—|
| **Compatibility** | Molten mixing at 155 ℃, 7-day storage at 25 ℃ | Transparent and homogeneous, viscosity change ≤±10% |
| **Spread ratio** | Copper plate, SnAg3.0Cu0.5, IPC-TM-650-2.4.35 | ≥80% |
| **Insulation resistance** | 85℃/85% RH, 168 h, SIR | ≥1.0×10¹⁰ Ω |
| **Foam characteristics** | Initial foam of 1% aqueous solution, dissipation over 300 s | Initial ≤5 mm, largely dissipated by 300 s |
| **Halogen content** | Total F⁻+Cl⁻+Br⁻+I⁻ | <500 ppm (IPC J-STD-004B) |
| **Thermal stability** | Baked at 150 ℃/10 min | No significant discoloration/decomposition |
—
## 6. Risk Notes
### Evidence Boundaries
– The legal status of patents CN114289932A and CN101992366A ⏳ is pending official verification
– The “Surfynol 604” model designation is questionable and may be a typo for “Dynol 604”
– The LFS series has an **electronic cleaning background** and is not a validated flux application (Class C development screening)
### Process Risks
– Incomplete predilution of the FS-204 series → solid precipitation
– Dosage >0.5% (solder paste) → poor coating, reduced wetting
– LFS series cloud point below process temperature → loss of function
– Direct mixing with strongly acidic activators → may catalyze hydrolysis of the acetylenic alcohol
### Statement Limitations
– Low foaming ≠ detergency; lowering surface tension ≠ degreasing
– Electronic component cleaning background ≠ validated flux performance
– Dosage levels, temperature limits, and regulatory certifications not disclosed on the website are marked “**to be confirmed**”
—
## 7. Support and Next Steps
### Technical Support
– Free sample request: 022-82910362 (Tianjin Hipfer)
– TDS/SDS available at: www.surfychem.com
### Recommended Startup Plan
1. **Prioritize lab trials**: FS-204E + Superwet-604, dosage screening from 0.1-1.0% per the patent
2. **High insulation resistance required**: run parallel lab trials with LFS-111/LFS-112 (starting at 0.1%)
3. **Concurrent verification**: patent legal status (CNIPA pss-system)
