Higher processing temperature
Stable to about 330 °C, so it suits PP and polyamides.
MDH
Magnesium Hydroxide (MDH) Supplier from China
Magnesium hydroxide (MDH) is a halogen-free mineral flame retardant and smoke suppressant for polymers processed at higher temperatures, such as polypropylene, polyamides and cable compounds. SUNCHEM supplies magnesium hydroxide with a batch COA on every shipment; the TDS is sent on request.
CAS 1309-42-8 · Mg(OH)₂ · Magnesium dihydroxide
- Lot COA with every shipment
- Samples for your trials
- Technical support for your trial
Product overview & key benefits
Magnesium hydroxide decomposes at about 330 °C, absorbing heat and releasing water vapor, which cools the polymer and dilutes the flame; the magnesium oxide residue reduces smoke. Its higher decomposition temperature than ATH lets it be compounded into polypropylene, polyamides and other polymers processed above 200 °C.
As a high-loading filler, particle size, purity and surface treatment decide melt flow and mechanical properties.
Low smoke, halogen-free
Releases water and reduces smoke, with no halogen.
Specified on your terms
We quote against your Mg(OH)₂ content, particle size, whiteness, CaO and Fe content, moisture and surface treatment and send the batch COA for each lot.
Technical specifications
| Parameter | Typical value |
|---|---|
| Product name | Magnesium Hydroxide |
| Synonyms | MDH; MH |
| CAS No. | 1309-42-8 |
| EC No. | 215-170-3 |
| Formula | Mg(OH)₂ |
| Molecular weight | 58.32 |
| Appearance | White powder |
Mg(OH)₂ content, particle size, whiteness, CaO and Fe content, moisture and surface treatment limits depend on the producer grade and are stated on the TDS and batch COA; the limits for your order are confirmed in the quotation and contract.
Applications by Polymer
Where MDH is used, and what to confirm before you switch supply.
LSZH cable compounds
In low-smoke halogen-free cable compounds, especially where higher processing temperatures are used.
Check before trial
- Cable standard
- Particle size and surface treatment
- Monthly volume
Polypropylene and polyamides
In halogen-free PP and polyamide parts processed above 200 °C.
Check before trial
- UL 94 target
- Purity and particle size
- Bag size
Rubber, coatings and others
In rubber, coatings and other polymers needing a halogen-free smoke suppressant.
Check before trial
- Formulation
- Loading level
- Sample for trials
Selection & comparison
Choosing the right MDH grade
| Your requirement | What usually works |
|---|---|
| PP and polyamide compounds | Fine, surface-treated MDH |
| LSZH cables | Specify particle size and treatment |
| Processing below 200 °C | ATH may be more economical |
| Replacing an existing supplier | Send your current TDS or COA; we quote against the parameters you approve |
Packaging & storage
Packaging
Tell us the bag or drum size and pallet requirements you need; we confirm the packaging with the quotation.
Storage
Keep bags closed in a dry store.
From first email to approved supply
Name the end use
Name the polymer and the fire rating you must meet — UL 94 class and thickness, LOI or cable standard.
Compare the numbers that matter
Purity, particle size (D50), whiteness, CaO and Fe content, moisture and surface treatment.
Check melt flow
High loadings change flow; compare torque and mechanical properties in your trial.
Trial, then lock the spec
Compound a trial batch, run your fire and mechanical tests, and keep the approved lot COA as the reference.
Tell us your requirement. We match the grade.
Tell us the polymer, the fire rating you need, the quantity and the destination port. Add your current specification and we will quote against it.
| Information | Example |
|---|---|
| Application | Cable, PP, polyamides, rubber |
| Required specification | Purity, particle size, surface treatment |
| Packaging | Bag or drum size; pallets |
| Quantity | Sample / trial order / annual volume |
| Destination | Country and port |
| Documents needed | COA, SDS, TDS, RoHS/REACH |
Related products
Aluminum Hydroxide
Mineral flame retardant and smoke suppressant for cables and resins.
View product →Magnesium Hydroxide (MDH) FAQ
What is magnesium hydroxide used for?
As a halogen-free flame retardant and smoke suppressant in cable compounds, PP, polyamides, rubber and coatings.
Magnesium hydroxide or ATH?
Magnesium hydroxide for processing above about 200 °C; ATH for lower processing temperatures.
Which parameters should I compare between offers?
Purity, particle size, whiteness, CaO and Fe content, moisture and surface treatment.
Can I get the TDS?
Yes. Send an inquiry with your application and we email the TDS.
