As a new foreign trade service provider driven by both technology transformation and export business, HiSiaddi has established a "1+2+3+4=1" service system and can supply PASP polyaspartic acid sourced directly from multiple well-known original manufacturers. Equipped with R&D capabilities, HiSiaddi has partnered with factories on technology transfer and accurately captured market demands, repeatedly resolving customers’ customized requirements for PASP polyaspartic acid. Below is a case study of HiSiaddi addressing customized PASP specifications.
For inquiries about customized services, please contact HiSiaddi customer service.
The buyer is SEMI TECH, a high-end semiconductor wafer manufacturer based in Munich, Germany. The company specializes in 12-inch silicon wafers, chip photolithography and ultrapure water system operation, with 12 sets of RO+EDI ultrapure water lines on-site delivering stable water resistivity ≥18.2 MΩ·cm. It strictly complies with EU REACH, SVHC, SEMI F57 and German drinking water standards, ranking among the world’s top mid-to-high-end semiconductor clients.
The client places an annual order of 32 tons of customized high-purity phosphorus-free PASP polyaspartic acid for RO membrane scale inhibition, silicon wafer cleaning chelation and ultrapure water system corrosion protection. Previously, it long purchased customized PASP from BASF Germany, which came with drawbacks including high unit price (approx. EUR 28/kg), long lead time (8–10 weeks) and tight supply quotas. After switching to Chinese suppliers, the client found conventional domestic PASP products suffered common defects: high chroma (>30 Pt-Co), broad molecular weight distribution (PDI >1.5), high free monomer content (>0.5%), precipitation at low temperatures and excessive heavy metals. These failed to meet the stringent working conditions of semiconductor ultrapure water, and most manufacturers only offered standard grades unable to fulfill customized indicators. The client formally entrusted HiSiaddi with full responsibility for exclusive formula customization, process upgrading, sample verification, mass production delivery and long-term technical support.
Requirements: PASP solid content ≥42%, chroma ≤10 Pt-Co (nearly colorless), free monomer ≤0.2%, total heavy metals (Pb/Cd/Hg/Cr/Ni) <0.5 mg/kg, NTA-free, phosphorus-free and formaldehyde-free. Direct contact with ultrapure water must not cause silicon wafer contamination or membrane damage.
Semiconductor RO membrane operation demands molecular weight strictly confined to the 1900–2100 range with polydispersity index PDI <1.15. Conventional processes yield PDI >1.5, which leads to fluctuating scale inhibition efficiency, localized membrane scaling and increased cleaning frequency.
Raw material warehouses in Germany drop to -15°C in winter. Standard PASP turns turbid and precipitates at -5°C, with permanent loss of chelating performance after thawing. The customized product must remain transparent without crystallization and retain full performance after static storage at -15°C for 30 days.
EU mandates 28-day biodegradability ≥95% per OECD 301B standard, acute oral LD50 >5000 mg/kg, and no skin/eye irritation to satisfy environmental discharge requirements for semiconductor cleanrooms.
Must be compatible with semiconductor-specific nonionic surfactants, organic corrosion inhibitors and membrane protectants; mixed formulations shall remain homogeneous without stratification or flocculation for 6 months and avoid RO membrane micropore blockage via adsorption.
Semiconductor production lines require key indicator deviation between batches ≤0.1%. Traditional batch production generates large fluctuations that destabilize ultrapure water system operation.
HiSiaddi assembled a dedicated team consisting of polymer R&D PhDs, semiconductor water treatment engineers, process optimization specialists and compliance officers, collaborating with Yuanlian Chemical, a leading domestic manufacturer capable of customizing high-purity bio-based chemicals. The team adopted a "Seven-Step Customization Methodology" to complete formula debugging, process upgrading, lab/pilot testing, sample validation and mass production launch within 28 days.
· Adopt food-grade L-aspartic acid with optical purity ≥99.5% to eliminate impurities introduced by industrial-grade feedstock;
· Deploy patented gradient polymerization & controlled depolymerization technology with precise temperature control (185±2°C), vacuum control (-0.095 MPa) and regulated reaction duration, limiting molecular weight distribution PDI within 1.12 and stabilizing solid content at 42.3%.
Add three-stage precision filtration (0.1 μm), activated carbon deep decolorization and cation-anion exchange resin procedures to remove colored impurities, small-molecule byproducts and heavy metals. Final test results: chroma reduced to 8 Pt-Co (near colorless), free monomer controlled at 0.18%, total heavy metals <0.3 mg/kg, exceeding client specifications.
Blend food-grade polyol low-temperature stabilizers (VOC-free, non-toxic) to optimize intermolecular hydrogen bonding and miscible systems. Third-party testing confirms the product stays crystal-free and transparent after 30 days static storage at -15°C, with chelating performance retention ≥99.2%, completely resolving low-temperature storage failure.
Adjust post-hydrolysis processes to reduce hard-to-degrade branched byproducts. SGS test results: 28-day biodegradability reaches 96.1% (OECD 301B), acute toxicity LD50 >6000 mg/kg with zero irritation, meeting the EU’s highest environmental grade.
Conduct 120 groups of compatibility tests simulating 3 blending ratios and 5 water quality conditions on the client’s production site. Optimize component compatibility to ensure mixed formulations with existing reagents stay clear and stable for 6 months without turbidity, precipitation or membrane adsorption.
Deploy a fully enclosed DCS automatic production line with exclusive SOPs and real-time monitoring of all critical process parameters. Key indicator deviation per batch is controlled within 0.1%; each delivery batch is accompanied by full SGS test reports and SEMI F57 certification documents.
· Packaging: Imported German food-grade anti-static, UV-resistant HDPE sealed 25kg drums;
· Documentation: Bilingual Chinese-English GHS labels, REACH registration files, full SVHC screening reports, Certificates of Analysis (COA) and Certificates of Origin, complying with German customs clearance and client internal audit standards.
All indicators passed dual verification by the client’s laboratory and SGS. Under operating conditions ranging from -15°C to 85°C and high-silica high-alkali water quality, RO membrane scale inhibition efficiency hits ≥99.5%. Membrane cleaning cycles are tripled, silicon wafer yield rises by 0.8%, with zero membrane fouling or system malfunctions recorded.
· Procurement cost cut by 42% compared to BASF Germany, falling to EUR 16.2/kg;
· Lead time shortened from 8–10 weeks to 14 days;
· The 32-ton annual order was delivered in 5 batches without delays or quality disputes.
Full documentation passed German customs inspection, SEMI certification and client internal audits, enabling direct procurement for the client’s Dutch and Belgian subsidiaries without repeated compliance reviews.
Highly satisfied with HiSiaddi’s integrated technical customization and full-link service capacity, the client awarded full procurement of all high-purity water treatment chemicals for its plant—including membrane cleaners, biocides, EDI protectants and silicon wafer chelants—to HiSiaddi. Annual procurement volume exceeded EUR 1.2 million, establishing the client as HiSiaddi’s core strategic partner in the European semiconductor sector.
Overseas mid-to-high-end clients in semiconductors, precision manufacturing and premium water treatment focus on seven core metrics when purchasing PASP: purity, chroma, molecular weight distribution, low-temperature stability, biodegradability, membrane compatibility and batch consistency. Standard industrial-grade products cannot meet their rigorous requirements. Leveraging polymer R&D expertise, patented process resources, full-link quality control systems and international compliance capabilities, HiSiaddi delivers one-stop customized solutions tailored to individual client demands, fundamentally addressing personalized and stringent technical requirements. We have become the preferred supplier for overseas mid-to-high-end bio-based eco-friendly chemical procurement.
For inquiries about customized services, please contact HiSiaddi customer service.
+86-13120989737 
info@hisiaddi.com 
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