Tetramethylammonium Hydroxide (TMAH 25% EL)

Description

1. Product Overview

Tetramethylammonium Hydroxide (TMAH 25% EL) is a high-purity, quaternary ammonium base solution specifically formulated for demanding microfabrication and analytical chemistry processes. Its primary industrial use is as a photoresist developer and silicon etching agent in semiconductor, MEMS, and flat-panel display manufacturing. The key value proposition is its metal-ion-free (EL grade) composition, which eliminates ionic contamination risks, directly enabling higher yields in sub-micron lithography. Strategically, this product is indispensable as the global semiconductor industry pushes toward smaller nodes (≤28nm) and advanced packaging architectures.

2. Key Specifications & Technical Characteristics

• Chemical Composition: Tetramethylammonium hydroxide in deionized water, 25% wt/wt concentration

• Purity Grade: EL (Electronic Level) – Metal impurities ≤1 ppb per element; chloride, phosphate, sulfate ≤0.1 ppm

• Physical Characteristics:

  • Appearance: Colorless to faintly yellowish transparent liquid

  • Density: ~1.012 g/mL at 20°C

  • Viscosity: 2.4 cP at 25°C

  • Particle count: ≤100 particles/mL (>0.2 μm)

• pH: >13 (strongly basic)

• Packaging Options:

  • HDPE jerry cans: 20L, 25L

  • IBC totes: 200L, 1000L

  • Stainless steel tanker trucks (bulk)

• Shelf Life: 12 months from manufacturing when stored at 5–35°C in sealed, unopened containers away from CO₂ and light

3. Core Industrial Applications

• Semiconductor Manufacturing (front-end-of-line):

  • Positive photoresist developer for i-line, KrF, and ArF lithography – delivers defect-free pattern transfer due to ultra-low metal ion content, outperforming KOH or NaOH developers which leave mobile ion residues.

• MEMS & Silicon Etching:

  • Anisotropic wet etching of crystalline silicon – enables precise V-groove or cavity formation; preferred over EDP or KOH for its CMOS compatibility and higher etch rate uniformity.

• Flat-Panel Display & Advanced Packaging:

  • Stripping and cleaning applications in OLED and fan-out wafer-level packaging (FOWLP) – reduces undercut and residue compared to competing tetralkylammonium hydroxides.

• Analytical Chemistry:

  • Ion-pairing reagent in HPLC-MS – ensures baseline separation without metal contamination, improving sensitivity by 15–20% relative to lower-grade TMAH.

4. Competitive Advantages

• Quality Consistency: Batch-to-batch metal impurity variation <0.5 ppb – validated by ICP-MS and ion chromatography certificates included per shipment.

• Supply Reliability: Dedicated EL-grade production lines with real-time particle monitoring; buffer stock held in three regional hubs (Asia, Europe, North America) to guarantee 98% on-time delivery even during demand surges.

• Logistics Capability: Temperature-controlled fleet for summer shipments; anti-static, double-sealed packaging standard.

• Price Competitiveness: Direct factory supply with no brokers – yields 8–12% total cost savings versus comparable EL-grade TMAH from German or Japanese incumbents.

• Sustainability: Recyclable HDPE containers as standard; take-back program for IBC totes; wastewater treatment guidelines provided free of charge.

• Technical Support: Full SDS, PPAP Level 3 documentation, and application lab access for etch rate optimization and defectivity studies.

5. Commercial & Supply Information

• Minimum Order Quantity (MOQ):

  • 20L jerry can: 1 unit (trial orders accepted)

  • IBC 1000L: 2 units

• Bulk (20MT) Loading Capacity: 20 metric tons per ISO tank container or flexitank within 20FT container

• Loading per Standard Container (non-bulk):

  • 20FT container: 14 pallets × 4 drums (200L each) = 11.2 MT

  • 40FT container: 28 pallets = 22.4 MT