Industrial chemicals · Taylor, TXTechnical Data Sheet
Magnesium Hydroxide ACS
ACS
- CAS number
- 1309-42-8
- Structure
Structure · PubChem - Grade
- ACS
Identity & Composition
- Product Name
- Magnesium Hydroxide ACS
- Alliance Code
- magnesium-hydroxide-acs
- Grade
- ACS
- Concentration
- —
- CAS Number
- 1309-42-8PubChem
- Formula
- —PubChem
- Molecular Weight
- 58.320PubChem
- Product Type
- Pure substance
Specifications
| Test | Specification | Typical | Method | Source |
|---|---|---|---|---|
| Assay [Mg(OH)2] | 95.00 - 100.5 % | 97.77 % | — | Interpreted |
| Arsenic (As) | 3 ppm max | 0.08 ppm | — | Interpreted |
| Calcium (Ca) | 1.50 % max | 0.077 % | — | Interpreted |
| Carbonate (CO3) | To pass test | Passes test | — | Interpreted |
| Heavy metals (as Pb) | 0.01 % max | 0.0012 % | — | Interpreted |
| Loss on drying @ 105 C | 2.00 % max | 0.49 % | — | Interpreted |
| Loss on ignition | 30 - 33.00 % | 31.45 % | — | Interpreted |
| Identification (magnesium) | To pass test | Passes test | ACS identification test - flame reaction and precipitation with ammonium phosphate | Interpreted |
| Insoluble in dilute hydrochloric acid | 0.02 % max | 0.0082 % | Gravimetric - dissolve in dilute HCl, filter, ignite residue | Interpreted |
| Chloride (Cl) | 0.03 % max | 0.0059 % | Turbidimetric comparison with AgNO3 against chloride standard | Interpreted |
| Sulfate (SO4) | 0.10 % max | 0.011 % | Turbidimetric comparison with BaCl2 against sulfate standard | Interpreted |
| Iron (Fe) | 0.02 % max | 0.0023 % | Colorimetric, 1,10-phenanthroline (or ICP-OES) | Interpreted |
| Ammonium hydroxide precipitate (as R2O3) | 0.02 % max | 0.0055 % | Gravimetric - NH4OH precipitation, ignition to mixed oxides | Interpreted |
Values are reproduced from the current product reference. Source labels do not by themselves establish a supplier guarantee or a test result for your lot. Confirm applicable acceptance limits and request lot-specific documentation.
Available GradesSame CAS, alternate grades and concentrations
| Grade | Concentration | Typical Assay | SKU | TDS |
|---|---|---|---|---|
| This grade ACS | — | — | current | current |
| — | — | — | magnesium-hydroxide-technical | View TDS → |
Typical assay shown is the rolling-window mean from the sibling product's most recent lots. Grade selection drives downstream end-use — verify the sibling grade matches your specification before substitution.
Physical & Chemical Properties
| Property | Value | Source |
|---|---|---|
| Appearance | Fine white crystalline powder, opaque | Adjudicated |
| Form | Solid | Published reference |
| Odor | Odorless | Published reference |
| pH | pH = 9.5-10.5 (aqueous slurry) | Published reference |
| Density | 2.36 g/mL | Published reference |
| Boiling Point | 350 | Published reference |
| Melting Point | 350 °C (decomposes) | Adjudicated |
| Flash Point | N/A | Published reference |
| Solubility (water) | Practically insoluble in water and in ethanol | Published reference |
Regulatory & Transport
DOT / 49 CFR
- UN Number
- Not regulatedAdjudicated
- Hazard Class
- Not regulatedAdjudicated
- Packing Group
- Not regulatedAdjudicated
- Proper Shipping Name
- Not regulatedAdjudicated
GHS / OSHA HCS 2024
- Signal Word
- Not regulatedAdjudicated
- H-Codes (Hazard Statements)
- Not applicableAdjudicated
- P-Codes (Precautionary Statements)
- Not applicableAdjudicated
Occupational Exposure Limits
- OSHA PEL (29 CFR 1910.1000)
- —no canonical
- ACGIH TLV
- —no canonical
- NIOSH REL
- —no canonical
- NIOSH IDLH
- —no canonical
Transport descriptions reflect 49 CFR 172.101 lookup at time of publication. Sourced data: NIOSH Pocket Guide for REL/IDLH, OSHA Z-Tables for PEL. Always verify against the latest regulatory text before shipment-critical decisions.
Supplier Qualification Packet
One zipped download containing the TDS, SDS, latest lot COA (when available), and a fresh Letter of Continuing Guaranty for Magnesium Hydroxide ACS. Every file included is SHA-256 hashed and listed in a manifest your QA team can audit.
Applications
- Acid neutralizationmagnesiaspecialties.com
- Flame retardant and smoke suppressant in plasticsmagnesiaspecialties.com
- Acid scavenger in elastomersmagnesiaspecialties.com
- Production of magnesium salts, ceramics, and specialty applicationsmagnesiaspecialties.com
Applications are drawn from published manufacturer and supplier documentation; each is sourced. Suitability for a specific use is the buyer's to confirm.
Storage & Handling
- Recommended Storage
- Keep containers tightly closed in a dry, cool, well-ventilated place away from incompatible materials. Non-combustible solid; minimize dust formation and accumulation.Adjudicated
- Handling Precautions
- Use standard chemical PPE — splash goggles, gloves, lab coat. Refer to SDS for hazard-specific PPE requirements.Class-level guidance — not product-specific; the SDS controls.
- Incompatibilities
- Strong acids; strong oxidizing agents; phosphorus (spontaneous ignition); maleic anhydride.Adjudicated
- Shelf Life
- Consult Technical Services for product-specific shelf life
For full hazard, PPE, and emergency response guidance, refer to the Safety Data Sheet (SDS) for this product. The SDS controls in all cases where guidance differs.
Packaging & Logistics
Shipping Description (US DOT)
Not regulated for transport.
Confirm against shipping documents and carrier requirements before tender.
Revision History
Last reviewed 2026-06-17 by Andre Taki, Chief Commercial Officer, DOT Hazmat–certified (49 CFR 172.704).
| Version | Date | Change | Trigger |
|---|---|---|---|
| 1.4 | 2026-10-13 | Canonical data updated: 4 fields changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.3 | 2026-10-02 | Canonical data updated: 2 fields changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.2 | 2026-09-30 | Canonical data updated: 2 fields changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.1 | 2026-06-17 | Canonical data re-verified: 3 fields updated against independent vendor SDSs, CLP Annex VI, 49 CFR, and OSHA HazCom 2024 (GHS classification, hazard/precautionary codes, signal word, physical properties as applicable).
| canonical_change |
| 1.0 | 2026-05-20 | Initial URL-first TDS published from canonical chemistry registry. | initial |
This Technical Data Sheet is provided for technical reference. The Safety Data Sheet (SDS) controls in all cases where guidance differs. Values reflect Alliance Chemical canonical data at time of generation; subsequent revisions are recorded in the Revision History above.