Wet Electronic Chemicals Selection & Procurement Guide (2026): G1–G5 Grades, China Localization Progress and Supplier Qualification

Wet electronic chemicals — ultra-high-purity acids, bases, solvents and functional formulations — are among the highest-volume consumables in semiconductor, display and photovoltaic manufacturing, used in cleaning, lithography, etching and developing steps. With China’s wafer fabs expanding capacity and process nodes advancing, localization of electronic-grade hydrofluoric acid, sulfuric acid and hydrogen peroxide is accelerating. This guide covers grade tiers, product selection, China’s localization progress and supplier qualification, from a procurement perspective.

1. Start with Grades: SEMI Standards and the G1–G5 Tier System

Purity and particle control define wet electronic chemicals. The industry follows SEMI international standards, classifying products into five tiers by metallic impurity and particle levels:

• G1 (SEMI C1): metal impurities ≤ 1 ppm — discrete devices, solar cells;
• G2 (SEMI C7): ≤ 10 ppb — 0.8–1.2 μm processes;
• G3 (SEMI C8): ≤ 1 ppb — 0.2–0.6 μm processes and mainstream display fabs;
• G4 (SEMI C12): ≤ 0.1 ppb — 0.09–0.2 μm processes;
• G5: impurities at the 10 ppt level — advanced nodes below 90 nm, currently the focus of China’s localization push.

Selection takeaway: higher is not always better. G4/G5 products can cost several times more than G2. Display and PV lines are well served by G2–G3; over-specifying grades simply inflates cost without yield benefit.

2. Key Product Categories and Applications

• Electronic-grade sulfuric acid: one of the largest-volume items, used in SPM wafer cleaning; watch metal ion and particle specs;
• Electronic-grade hydrofluoric acid: core chemical for oxide etching and cleaning; advanced nodes require G4+, where supply in China remains tight;
• Electronic-grade hydrogen peroxide: paired with sulfuric acid and ammonia in RCA cleaning; stability and packaging cleanliness are critical;
• Ammonia, hydrochloric and nitric acid: auxiliary cleaning/etching chemicals; domestic G3–G4 supply is now mature;
• Developers (TMAH), strippers and etchants (BOE, aluminum etchants): formulation-driven products where supplier know-how and batch consistency matter most.

3. Localization Progress: A Gradient from Solar to Silicon

China’s localization path has been clear: photovoltaics first, then displays, then semiconductors. Domestic share now exceeds 80% in PV and display applications. In semiconductors the overall localization rate sits around 35%–45%: G3–G4 products for mature nodes (28 nm and above) are supplied in volume by domestic producers, while G5-grade chemicals for nodes below 90 nm are still dominated by international suppliers such as BASF, Merck, Mitsubishi Chemical and Stella Chemifa.

For buyers, this defines a clear window: mature-node fabs can begin qualifying domestic second sources now, while advanced-node lines should keep an “import-primary plus domestic-qualification” structure during the transition.

4. Five Hard Criteria for Supplier Qualification

1. Batch consistency data: request COA statistics across at least 20 consecutive batches (metals, particles, anions) — evaluate variance, not just averages;
2. Packaging and logistics: high-grade products demand cleanroom-grade drums, dedicated tankers or NOWPak-type containers; secondary contamination in transit is a common failure mode;
3. Capacity and feedstock integration: check whether upstream raw materials (anhydrous HF, industrial sulfuric acid) are self-supplied — feedstock volatility directly hits supply stability;
4. On-site technical support: chemical change-over qualification typically takes 3–6 months; a supplier’s ability to support on-tool trials and respond fast to excursions determines real switching cost;
5. Quality systems and track record: beyond ISO/IATF certificates, verify actual volume-supply references at leading wafer or panel fabs.

5. Procurement Strategy Recommendations

• Build a tiered sourcing list by product × grade: localize G2–G3 items first for cost savings, keep dual sources for G4–G5;
• Add feedstock price-linkage clauses to long-term agreements to hedge sulfur and fluorspar volatility;
• Onboard new suppliers in four steps — sample testing, small-lot on-tool trial, parallel qualification, formal switch — and budget at least one quarter for validation;
• Mind logistics radius: wet chemicals (HF in particular) are hazardous cargo, and near-site supply meaningfully cuts freight and safety costs.

Conclusion

Wet electronic chemicals procurement is entering an accelerated localization phase. For downstream manufacturers, now is the right time to restructure supplier portfolios and lock in cost advantages — the key is precise grade selection and disciplined qualification, not chasing “highest purity” or “lowest price.” For supplier shortlists and price-band analysis on specific products (electronic-grade HF, sulfuric acid, TMAH developers and more), contact us for a tailored report.