Magnesium Hydroxide MDH is inorganic mineral flame‑retardant powder processed by purification, fine grinding, classification and specialized surface coating treatment. It achieves flame‑retardant effect through endothermic thermal decomposition and water‑release at high temperature without releasing halogen‑based toxic fumes. The surface coating enhances interfacial affinity with polyolefin resin matrix. This functional filler is specially developed for HFFR polyolefin cable materials, helping c

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Product DetailsThis surface‑coated magnesium hydroxide MDH is manufactured from high‑grade magnesium‑based mineral raw materials. It goes through purification treatment, ultrafine milling, precise air classification to control narrow particle‑size distribution and eliminate coarse grit particles. Afterwards, continuous surface‑coating modification is conducted on individual powder particles.

Unmodified MDH possesses strong hydrophilic surface property. When directly incorporated into non‑polar polyolefin resins, poor interfacial bonding will cause particle agglomeration, sharply increased melt viscosity, deteriorated tensile strength and elongation of finished cable compounds, which also brings difficulties during high‑speed cable extrusion. The surface‑coating treatment changes the particle‑surface characteristic to organophilic, improves powder free‑flowing performance and homogeneous dispersion within polyolefin matrix. It effectively lowers melt viscosity at high filling loading and mitigates the deterioration of mechanical properties of the cable sheathing.

The flame‑retardant mechanism relies on endothermic decomposition above approximately 330℃. It releases crystal water to cool down the combustion zone and dilute flammable gaseous decomposition products. The residual magnesium‑oxide residue forms a dense protective char layer on the material surface. This barrier layer blocks oxygen and heat transfer and restrains further thermal decomposition of polyolefin substrate. During combustion, MDH generates only low smoke density and no corrosive halogen‑containing gas.

The product features controlled particle‑size distribution, low heavy‑metal content and stable moisture index. Low moisture level is critical to avoid bubble defects on cable sheath during continuous extrusion. It is widely used in EVA, LLDPE and PO‑based halogen‑free low‑smoke cable compounds.

Typical application fields include power cable sheathing, building wiring insulation, communication cable HFFR formulations and thermoplastic elastomer cable materials.

Packaging adopts 25 kg moisture‑proof woven bags with inner polyethylene liner. Keep packaging tightly sealed in transportation and storage. Store inside cool, dry warehouse to prevent moisture absorption and powder caking. Avoid excessive stacking height on pallets to prevent bag rupture. Wear dust‑proof masks and protective gloves for powder‑handling operations.

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Magnesium Hydroxide MDH CAS 1309-42-8, Surface-Coated Low-Smoke Halogen-Free Flame Retardant for Polyolefin Cable

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Jishengya Technology

Shenzhen Jishengya Technology Co., Ltd. is located in Shenzhen, a special economic zone, and is a comprehensive technology enterprise integrating independent R&D, production and sales.