Aluminum Hydroxide

CAS 21645-51-2  ·  AlH₃O₃  ·  MW 78.004 g/mol

Full record: Aluminum Hydroxide — Safety Data Sheet →

Loading molecule...
3D model Aluminum Hydroxide, CAS 21645-51-2, molecular formula AlH₃O₃, molar mass 78.004 g/mol
About Aluminum Hydroxide

Aluminum Hydroxide is a chemical compound registered under number CAS 21645-51-2, with the molecular formula AlH₃O₃, and a molar mass of 78.004 g/mol.

The molecule contains 7 atoms connected by 3 chemical bonds. The full systematic IUPAC name of this compound is aluminum trihydroxide. The interactive 3D model above lets you view the spatial arrangement of the atoms — you can rotate it with the mouse, zoom with the scroll wheel, and switch between skeletal / Ball & Stick / Space Fill visualization modes.

In terms of physicochemical properties, polar surface area PSA = 3 Ų, 3 donors and 3 hydrogen bond acceptors. These parameters are key when assessing bioavailability and interaction with biomolecules.

Chemical data for this compound comes from PubChem (NIH NLM NCBI), one of the world's largest chemical databases. All information is updated automatically and enriched with GHS hazard statement translations compliant with the CLP Regulation (EC 1272/2008). The interactive 3D model and the viewer images are protected by copyright (© MolGod.org) — terms of use: molgod.org/copyright/.

Physicochemical properties
Molecular formulaAlH₃O₃
Molar mass78.004 g/mol
IUPACaluminum trihydroxide
SMILES[OH-].[OH-].[OH-].[Al+3]
InChIKeyWNROFYMDJYEPJX-UHFFFAOYSA-K
logP (XLogP3)—
PSA3 Ų
HBD / HBA3 / 3
PubChem CIDCID 10176082 ↗
GHS safety

Signal word: Warning

GHS07
GHS07

H315 — Causes skin irritation

H319 — Causes serious eye irritation

H335 — May cause respiratory irritation

Scientific literature

Brak articles naukowych dla CAS 21645-51-2 w PubMed / OpenAlex / Semantic Scholar.

Synonyms
Hydrated alumina · aluminum hydrate · Dried aluminium hydroxide · Aluminum hydroxide, dried · Aluminium hydroxide, dried · Aluminum hydroxide gel, dried · Aluminium hydroxide gel, dried · Hydroxyde d' aluminium · aluminium(III) hydroxide · Di-mu-hydroxytetrahydroxydialuminum · Alum Adjuvant · Basalgel · Dermadrox · Sarpep · DermaMed
Data sources
📜 License & provenancePREDICTED MODEL · NOT VERIFIEDMolGod_License_1
PREDICTED MODEL — NOT VERIFIED
computed by MolGod Scientific · experimental feature (beta) · may contain errors
ILLUSTRATIVE FRAGMENT ARRANGEMENT — relative positions are not structural data

No source 3-D conformer was available to MolGod for this substance. MolGod Scientific computed this geometry from the structural formula with RDKit 2026.03.6 (ETKDGv3 conformer generation, MMFF94 force-field optimisation; lowest-energy converged conformer of a fixed-seed set). It is not a measured structure, it does not come from PubChem, and it has not been compared with experimental data. It shows one possible conformation.

This substance consists of 4 separate components (for example ions). Each component was computed separately; they are arranged radially around a layout anchor for visualisation only (at least 3.0 Å apart). Their relative positions are not a crystal structure, coordination geometry, ionic contacts or any experimentally determined arrangement.

Methods and references
  1. RDKit: Open-source cheminformatics, version 2026.03.6. Zenodo. doi:10.5281/zenodo.22140358 (all versions: doi:10.5281/zenodo.591637)
  2. Riniker S, Landrum GA. Better Informed Distance Geometry: Using What We Know To Improve Conformation Generation. J. Chem. Inf. Model. 2015, 55, 2562-2574. doi:10.1021/acs.jcim.5b00654
  3. Wang S, Witek J, Landrum GA, Riniker S. Improving Conformer Generation for Small Rings and Macrocycles Based on Distance Geometry and Experimental Torsional-Angle Preferences. J. Chem. Inf. Model. 2020, 60, 2044-2058. doi:10.1021/acs.jcim.0c00025
  4. Halgren TA. Merck molecular force field. I. Basis, form, scope, parameterization, and performance of MMFF94. J. Comput. Chem. 1996, 17, 490-519. doi:10.1002/(SICI)1096-987X(199604)17:5/6<490::AID-JCC1>3.0.CO;2-P
  5. Tosco P, Stiefl N, Landrum G. Bringing the MMFF force field to the RDKit: implementation and validation. J. Cheminform. 2014, 6, 37. doi:10.1186/s13321-014-0037-3
  6. Heller SR, McNaught A, Pletnev I, Stein S, Tchekhovskoi D. InChI, the IUPAC International Chemical Identifier. J. Cheminform. 2015, 7, 23. doi:10.1186/s13321-015-0068-4
  7. Kim S, Chen J, Cheng T, et al. PubChem 2025 update. Nucleic Acids Res. 2025, 53, D1516-D1525. doi:10.1093/nar/gkae1059 Compound record: https://pubchem.ncbi.nlm.nih.gov/compound/10176082
  8. Bolton EE, Kim S, Bryant SH. PubChem3D: Conformer generation. J. Cheminform. 2011, 3, 4. doi:10.1186/1758-2946-3-4 (cited for contrast: no source 3-D conformer was available to MolGod for this record)
Model
Aluminum Hydroxide · 21645-51-2
InChIKey
WNROFYMDJYEPJX-UHFFFAOYSA-K
License & provenance record
Aluminum Hydroxide (CAS 21645-51-2) →
MolGod molecule record
Aluminum Hydroxide →
Source data
PubChem CID 10176082 ↗
Model information
not published yet

This license applies to the MolGod-created STL mesh, not automatically to third-party source material.

—