Magnesium Hydroxide
High purity magnesium hydroxide. High activity and high dispersibility let it compound into polymers easily, so it works as a functional filler and as a precursor to high purity MgO — where a hydroxide route disperses better in the process than a pre-calcined oxide.
CAS 1309-42-8 · Mg(OH)₂ · ZH-H1
Minimum order quantity, lead time and packing depend on the grade and the order size — confirm them with us on an inquiry.
Full specification in the batch TDS
What you see above is what we publish openly. The complete parameter set — including the values still marked to be confirmed — is issued with the batch technical data sheet. Download the current TDS, or ask us for the full specification and the latest certificate of analysis.
| Specifications | Guaranteed value | Typical value | |
|---|---|---|---|
| Mg(OH)₂ (%) | On request | On request | On request |
| MgO (ignited basis) (%) | On request | On request | On request |
| CaO (%) | On request | On request | On request |
| Chloride (Cl-) (%) | On request | On request | On request |
| Iron (Fe) (%) | On request | On request | On request |
| Acid insoluble matter (%) | On request | On request | On request |
| Moisture (%) | On request | On request | On request |
| Loss on ignition (%) | On request | On request | On request |
| Specific surface area (m²/g) | On request | On request | On request |
| Particle size D50 (µm) | On request | On request | On request |
| Bulk density (g/ml) | On request | On request | On request |
| Whiteness (%) | On request | On request | On request |
| Surface treatment | On request | On request | On request |
| Decomposition onset (°C) | On request | On request | On request |
Cells marked Values marked "On request" are grade-specific; our technical team issues them with the full data sheet.
25 kg multi-wall kraft bags with PE inner liner, palletised
Store sealed, dry, off the floor, in delivery order. Magnesium compounds pick up moisture and CO₂ from air.
Full Product Catalogue
Magnesium Oxide Grade Table
Magnesium Hydroxide Grade Table
Magnesium Carbonate Grade Table
Packing & Storage Guide
Sample Certificate of Analysis (example)
High purity magnesium hydroxide at 99% minimum, with acid insoluble matter held to 0.07% and chloride to 0.35%. Sits alongside ZH-H1 for electronic and functional materials; the two differ in impurity limits and bulk density, not in chemistry.
View detailsHigh purity magnesium hydroxide, third step in the H series. Held at P1 deliberately: H1/H2/H3 differ too little to publish all three without thin content.
View detailsBuilt for low-smoke zero-halogen compounds: decomposes endothermically above 300 °C, releases water vapour rather than toxic or corrosive gas, and is surface-treated so it disperses in polyolefins without overloading the formulation with coupling agent.
View detailsIt is a vulcanising agent and a vulcanisation activator — not an accelerator and not a filler. MgO controls scorch time, raises crosslink density and neutralises the acidic by-products of vulcanisation. If you dose it as if it were a filler, the compound will not cure the way your formulation expects.
Bulk density. Light grades have low bulk density and high specific surface area — they react faster and occupy more volume per kilogram. Heavy grades are dense and free-flowing. Light is the conventional choice for rubber; heavy suits technical ceramics and volume-limited processes. A container of light material fills by volume long before it fills by mass, so quote by tonne and plan by cubic metre.
Active MgO has a high specific surface area — ZH-M600 runs at 175 m²/g minimum and ZH-V150 at 150 m²/g. Specify it when reactivity is what your formulation is short of: adsorbents for harmful gases, electronic components, inks, and rubber or plastics where it functions as both filler and reinforcing agent. If the constraint is purity rather than reactivity, ZH-V2 or ZH-V3H is the right choice instead.
Minimum order quantity, lead time and packing depend on the grade and the order size — confirm them with us on an inquiry.