Magnesium Hydroxide (MDH) is an effective halogen-free flame retardant that releases water when heated, helping to suppress smoke, dilute flammable gases, and cool the material surface. It is widely used in thermoplastics, wire & cable compounds, and elastomers.
| Property | Typical Value |
|---|---|
| Chemical Formula | Mg(OH)₂ |
| CAS No. | 1309-42-8 |
| Appearance | White fine powder |
| MgO Content | ≥ 60% |
| Loss on Ignition | 31% – 33% |
| Decomposition Temp. | > 330 °C |
| pH (10% slurry) | 9.5 – 10.5 |
| Particle Size (D50) | 1 – 10 μm (customizable) |
| Issue | MDH Advantage |
|---|---|
| Need flame retardant for high temp processing | MDH decomposes above 330 °C, ideal for engineering resins |
| Concern about halogen emissions | MDH is halogen-free and eco-safe |
| Excessive smoke in electrical fires | MDH reduces smoke density and toxicity |
| Need physical filler with flame function | Dual role as filler and flame retardant |
Q1: Can MDH be combined with ATH?
Yes. MDH and ATH are often combined for balanced thermal properties and processing flexibility.
Q2: Is MDH suitable for injection molding?
Yes. It is widely used in extrusion, injection, and compression molding.
Q3: Will it affect transparency?
Like most fillers, MDH may reduce transparency in clear applications.
