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Ammonium Hydroxide Semiconductor Grade (NH4OH SC-1)

CAS Number: 1336-21-6

Semiconductor grade ammonium hydroxide (28–30% NH3) is a key component of the RCA SC-1 cleaning solution (NH4OH/H2O2/H2O) used for particle and organic contamination removal from silicon wafers. It also performs light silicon oxide etching to undercut and lift particles. Its ultra-pure quality prevents the introduction of metallic contamination during critical pre-gate-oxide cleaning.

Technical Specifications

appearanceColorless clear liquid
purity (%)≥28.0 (NH3 assay)
chloride (Cl-)≤0.1 ppm
metallic impurities≤1 ppb each (SEMI C5 grade)
non-volatile residue≤1 ppm

Applications

  • SC-1 (APM) particle and organic removal clean
  • Pre-gate oxide RCA clean sequence
  • Silicon oxide light etch for particle lift-off
  • TMAH-based developer additive
  • Ammonia-peroxide mixture (APM) for CMP post-clean

Key Features

  • SEMI C5 ultra-pure grade for critical SC-1 RCA cleaning sequences
  • Controlled NH3 content ensures reproducible SC-1 etch rate and particle removal
  • Low non-volatile residue prevents surface staining after cleaning
  • Supplied in sealed HDPE containers with cold-chain shipping capability

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Ammonium Hydroxide Semiconductor Grade (NH4OH SC-1) chemical structure

CAS Number

1336-21-6

Availability

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