Flame retardant and smoke suppressant
Releases water when heated and reduces smoke, with no halogen.
ATH
Aluminum Hydroxide (ATH) Supplier from China
Aluminum hydroxide (ATH) is a halogen-free mineral flame retardant and smoke suppressant for wire and cable compounds, rubber, unsaturated polyester (SMC/BMC), artificial stone, epoxy and coatings. SUNCHEM supplies ATH with a batch COA on every shipment; the TDS is sent on request.
CAS 21645-51-2 · Al(OH)₃ · Alumina trihydrate
- Lot COA with every shipment
- Samples for your trials
- Technical support for your trial
Product overview & key benefits
ATH starts to decompose at about 200 °C, absorbing heat and releasing water vapor that cools the polymer and dilutes the flame; the alumina left behind protects the surface and reduces smoke. Because it is used at high loadings, particle size, surface treatment and purity strongly affect processing and mechanical properties.
ATH suits polymers processed below about 200 °C, such as EVA and PE cable compounds, rubber, UPR and epoxy. For higher processing temperatures, magnesium hydroxide is used instead.
Filler economics
Used at high loadings as both flame retardant and filler.
Specified on your terms
We quote against your Al₂O₃ content, particle size, whiteness, oil absorption, moisture, soluble Na₂O and surface treatment and send the batch COA for each lot.
Technical specifications
| Parameter | Typical value |
|---|---|
| Product name | Aluminum Hydroxide |
| Synonyms | ATH; alumina trihydrate; aluminium hydroxide |
| CAS No. | 21645-51-2 |
| EC No. | 244-492-7 |
| Formula | Al(OH)₃ |
| Molecular weight | 78.0 |
| Appearance | White powder |
Al₂O₃ content, particle size, whiteness, oil absorption, moisture, soluble Na₂O 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 ATH is used, and what to confirm before you switch supply.
Low-smoke halogen-free cables
The main flame retardant in EVA and PE low-smoke halogen-free (LSZH) cable compounds.
Check before trial
- Cable standard
- Particle size and surface treatment
- Monthly volume
SMC/BMC, artificial stone and epoxy
Used in unsaturated polyester SMC/BMC, solid surface and artificial stone, and epoxy potting.
Check before trial
- Whiteness and particle size
- Viscosity in resin
- Bag size
Rubber, coatings and carpet backing
Used in rubber products, coatings, adhesives and carpet backing.
Check before trial
- Process temperature
- Loading level
- Sample for trials
Selection & comparison
Choosing the right ATH grade
| Your requirement | What usually works |
|---|---|
| LSZH cable compounds | Fine, surface-treated ATH |
| UPR, artificial stone | Specify whiteness and particle size |
| Processing above about 200 °C | Use magnesium hydroxide instead |
| 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
Particle size (D50), whiteness, oil absorption, moisture, soluble soda and surface treatment.
Mind the processing temperature
Keep compounding below about 200 °C or ATH starts releasing water.
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, UPR/SMC/BMC, artificial stone, rubber |
| Required specification | Particle size, whiteness, 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 (ATH) FAQ
What is ATH used for?
As a halogen-free flame retardant and smoke suppressant in cable compounds, UPR and artificial stone, epoxy, rubber, coatings and carpet backing.
ATH or magnesium hydroxide?
ATH for processing below about 200 °C; magnesium hydroxide for higher processing temperatures such as PP and polyamides.
Which parameters should I compare between offers?
Particle size, whiteness, oil absorption, moisture, soluble soda and surface treatment.
Can I get the TDS?
Yes. Send an inquiry with your application and we email the TDS.
