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Bis Sodium Sulfopropyl Disulfide | Premium SPS Brightener
- Time of issue:Oct . 25, 2025 15:40
(Summary description)Tangshan Moneide Trading Co., Ltd. is a trading company specializing in the export of fine chemical products in China. Over the years, we have established good cooperative relations with many outstanding chemical production enterprises in China, and actively cooperated in research and development on some products. Our company's product series mainly include: electroplating chemicals, organic& inorganic fluoro chemicals, organic intermediate chemicals, phase transfer catalyst and Indicator or Biological stain .
- Categories:Company dynamic
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- Time of issue:2019-12-30 10:55
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If you build copper plating baths for PCBs or damascene lines, you already know the “accelerator” everyone whispers about. I’m talking about Bis Sodium Sulfopropyl Disulfide—SPS for short. It’s one of those deceptively simple molecules that quietly decides whether your vias fill perfectly or end up with annoying voids. I’ve toured a few lines in South China and, to be honest, the teams that track SPS with discipline tend to sleep better. Bis Sodium Sulfopropyl Disulfide (SPS, CAS 27206-35-5) is the classic acid copper accelerator. It partners with PEG/suppressors and a leveler; chloride seals the chemistry. In fact, SPS gets reduced at the cathode to MPS, speeding local deposition and enabling superfilling. Many customers say it’s the difference between “good enough” and “production-proof.” - Materials: acid copper bath with CuSO4·5H2O 200–250 g/L, H2SO4 50–75 g/L, Cl− 50–70 mg/L; PEG 2000–5000 at 200–400 ppm; leveler a few ppm; Bis Sodium Sulfopropyl Disulfide at 1–5 mg/L (PCB) or 0.5–2 mg/L (damascene). - Methods: Pre-clean → micro-etch → acid dip → copper strike (if needed) → acid copper plating with live additive control via CVS and HPLC. Current density 1–3 A/dm², 22–28°C. - Testing standards: CVS per IPC‑TM‑650 2.3.25; moisture by ASTM E203; coating adhesion per ASTM B571; thickness by ASTM B567. Compliance: REACH, RoHS. Certifications often include ISO 9001 and ISO 14001. - Service life: additive is consumed electrochemically; top-up usually 0.05–0.20 g/kAh (≈) based on CVS curves. In high-throughput lines, daily adjustment is normal. Industries: HDI PCBs, IC substrates, wafer-level damascene copper, connectors, and occasionally decorative Cu underlayers. Surprisingly, we’re seeing more mid-sized PCB shops add online CVS for tighter SPS control. Microvia 100 μm, AR≈1:1, bath as above with Bis Sodium Sulfopropyl Disulfide 2 mg/L, PEG 3000 300 ppm, Cl− 60 ppm at 2.0 A/dm²: via filling in 18–22 min; surface leveling improved by ≈15%; throwing power +12–18% vs. SPS-free control. Custom options: particle size control, low-chloride grades, and tighter moisture specs for semicon fabs. Packaging: 1 kg bottles for lab, 25 kg fiber drums for production. Several PCB shops told me the 1–3 mg/L window with PEG/Cl− tuned gave consistent blind microvia fill; one process engineer joked, “When SPS is happy, our X-sections look like brochures.” Expect COA with assay (HPLC), moisture (KF), trace metals (ICP), and SDS. REACH and RoHS statements are standard; ISO 9001/14001 on request. For critical lines, ask for CVS titration curves and stability data over 6 months at ambient.
What it is and why it matters
Typical product specs
Name
Bis-(sodium sulfopropyl)-disulfide (SPS)
CAS
27206-35-5
Assay (HPLC)
≥ 98.0% (typ.)
Appearance
White to off‑white crystalline powder
Moisture (KF)
≤ 1.0% (w/w)
Formula (approx.)
C6H12Na2O6S4 (≈)
Solubility
Freely soluble in water
Process flow and real-world use
Performance snapshot (lab data, may vary)
Vendor comparison (indicative)
Vendor
Assay
CVS Support
Lead Time
Notes
Moneidechem (Hebei, China)
≥98% (typ.)
Method setup + retention samples
≈2–3 weeks
Origin: 2-7-523 Jidong Building Materials Tangshan, Hebei 064000 China
Global Trader
97–99%
Datasheet only
≈4–6 weeks
Broader portfolio, less tech depth
Local Distributor
≈96–98%
Basic QC
Stock dependent
Fast response; variable lots
Customization, packaging, feedback
Compliance and documentation
Moneide Chemicals
