Technical Data Sheet

Magnesium Hydroxide Technical

Alliance Code: magnesium-hydroxide-technical
Reviewed: 2026-06-17
Revision: 1.4

CAS number: 1309-42-8
Structure: Structure · PubChem

Last reviewed 2026-06-17 by Andre Taki, Chief Commercial Officer.

Identity & Composition

Product Name: Magnesium Hydroxide Technical
Alliance Code: magnesium-hydroxide-technical
Grade: —
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)	99.0% min	99.36%	by difference	Interpreted
Aluminum Oxide (Al2O3)	0.15 % max.	0.023 %	—	Interpreted
Calcium (as CaO)	0.20% max	0.11%	—	Interpreted
Calcium Oxide (CaO)	0.70 % max.	0.11 %	—	Interpreted
Fineness, % passing 325 mesh	99.5 % min.	99.99 %	—	Interpreted
Iron (as Fe)	0.01% max	0.0023%	—	Interpreted
Iron Oxide (Fe2O3)	0.20 % max.	0.0035 %	—	Interpreted
Magnesium Oxide (MgO), equivalent	67.7 % min.	68.6 %	—	Interpreted
Median particle size	0.8 - 2.0 microns	1.5	—	Interpreted
Particle Size Distribution MsD50	1.70 mic max	1.41	—	Interpreted
Particle Size Distribution MsD90	4.70 mic max	3.83	—	Interpreted
Particle size: Residue on 325 mesh	1.0% max	0.01%	wet sieve	Interpreted
Silicon Oxide (SiO2)	0.35 % max.	0.035 %	—	Interpreted
Sulfates (as SO4)	0.15% max	0.058%	—	Interpreted
Surface area (BET)	7 - 18 m2/g	12.2	—	Interpreted
Free moisture	2.0 % max.	0.28 %	—	Interpreted
Chloride (Cl)	0.35 % max.	0.070 %	—	Interpreted
Loss on ignition	30.0 - 33.0 %	31.5 %	—	Interpreted
Whiteness (ISO brightness, R457)	95.0 % min.	98.0 %	Reflectance photometer, ISO 2470	Interpreted
Sodium (as Na2O)	0.30 % max.	0.065 %	ICP-OES (or flame photometry)	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 —	—	—	current	current
ACS	—	—	magnesium-hydroxide-acs	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	White, odorless powder	Adjudicated
Form	Solid	Published reference
Odor	Odorless	Published reference
pH	9.5 - 10.8	Interpreted
Density	0.30 - 0.60 g/cm3	Interpreted
Boiling Point	354	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 Technical. Every file included is SHA-256 hashed and listed in a manifest your QA team can audit.

Download audit packet

Applications

Technical and industrial uses, including neutralization processes, waste water treatment, and paint applicationiclgroupv2.s3.amazonaws.com
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: 36 monthsiclgroupv2.s3.amazonaws.comStored in original packaging in a dry, ventilated space

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.

NMFC Class

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. storage_precautions· canonical change (coa.data_provenance / adjudication) incompatible_materials· canonical change (coa.data_provenance / adjudication) conditions_to_avoid· canonical change (coa.data_provenance / adjudication) hazardous_decomposition_products· canonical change (coa.data_provenance / adjudication)	canonical_change
1.3	2026-10-02	Canonical data updated: 2 fields changed via the provenance/adjudication pipeline. hazard_h_codes· canonical change (coa.data_provenance / adjudication) hazard_p_codes· canonical change (coa.data_provenance / adjudication)	canonical_change
1.2	2026-09-30	Canonical data updated: 2 fields changed via the provenance/adjudication pipeline. meltingPoint· canonical change (coa.data_provenance / adjudication) appearance· canonical change (coa.data_provenance / adjudication)	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). countryOfOrigin· canonical adjudication / reground (coa.data_provenance) dotSubsidiaryHazardClass· canonical adjudication / reground (coa.data_provenance) hsCode· canonical adjudication / reground (coa.data_provenance)	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.