|
HS Code |
775300 |
| Chemical Name | Magnesium Hydroxide |
| Chemical Formula | Mg(OH)2 |
| Appearance | White solid |
| Molar Mass | 58.32 g/mol |
| Melting Point | 350°C (decomposes) |
| Solubility In Water | Slightly soluble |
| Density | 2.34 g/cm³ |
| Ph | 10.5 (saturated solution) |
| Odour | Odourless |
| Cas Number | 1309-42-8 |
| Common Uses | Antacid, laxative, water treatment |
| Stability | Stable under normal conditions |
| Hazard Statements | Generally considered non-hazardous |
| Synonyms | Milk of magnesia |
| Chemical Name | Magnesium Hydroxide |
| Chemical Formula | Mg(OH)2 |
| Appearance | White solid |
| Molar Mass | 58.32 g/mol |
| Melting Point | 350 °C (decomposes) |
| Solubility In Water | Slightly soluble (0.0009 g/100 mL at 18 °C) |
| Density | 2.344 g/cm³ |
| Ph | About 10.5 (in aqueous suspension) |
| Odor | Odorless |
| Common Uses | Antacid, laxative, wastewater treatment |
| Cas Number | 1309-42-8 |
| Boiling Point | Decomposes before boiling |
| Taste | Slightly bitter |
| Stability | Stable under normal conditions |
| Color | White |
As an accredited Magnesium Hydroxide factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | White high-density polyethylene drum with secure lid, labeled "Magnesium Hydroxide," net weight 25 kg, includes safety and handling instructions. |
| Container Loading (20′ FCL) | Magnesium Hydroxide, packed in secure bags or drums, is loaded into a 20′ FCL container for safe bulk transportation. |
| Shipping | Magnesium Hydroxide is shipped in tightly sealed containers, typically as a powder or slurry. Containers should be clearly labeled, kept dry, and stored in a cool, well-ventilated area. During transportation, avoid contact with acids and incompatible substances. Follow regulations for non-hazardous chemicals to ensure safe delivery. |
| Storage | Magnesium hydroxide should be stored in a tightly closed container in a cool, dry, and well-ventilated area, away from moisture and acids. Keep it away from incompatible substances and sources of ignition. Avoid exposure to excessive heat or humidity to prevent degradation. Containers should be clearly labeled, and storage areas should be kept free from combustible materials for safety. |
| Shelf Life | Magnesium Hydroxide typically has a shelf life of 2-3 years when stored in tightly closed containers at cool, dry conditions. |
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Purity 98%: Magnesium Hydroxide with 98% purity is used in wastewater treatment, where it efficiently neutralizes acidic effluents and reduces heavy metal solubility. Particle Size 5 µm: Magnesium Hydroxide with particle size 5 µm is used in flame retardant formulations, where it enhances dispersion and maximizes heat absorption for fire resistance. Suspension Viscosity: Magnesium Hydroxide with controlled suspension viscosity is used in slurry applications for flue gas desulfurization, where it ensures consistent flow and effective SO₂ removal. Stability Temperature 350°C: Magnesium Hydroxide stable up to 350°C is used in polymer production, where it maintains integrity during high-temperature processing and improves product safety. Pharmaceutical Grade: Magnesium Hydroxide of pharmaceutical grade is used in antacid manufacturing, where it ensures safe neutralization of gastric acid and reliable patient outcomes. Low Impurity Content: Magnesium Hydroxide with low impurity content is used in food additive processing, where it provides high purity and compliance with food safety regulations. High Surface Area: Magnesium Hydroxide with high surface area is used in rubber compounding, where it increases reactivity and enhances curing efficiency. Fine Powder Form: Magnesium Hydroxide in fine powder form is used in cosmetics as a pH adjuster, where it offers uniform consistency and minimizes skin irritation. Standardized Moisture Content: Magnesium Hydroxide with controlled moisture content is used in fertilizer formulations, where it improves stability and flow properties during storage and application. USP Compliance: Magnesium Hydroxide meeting USP standards is used in over-the-counter laxative products, where it guarantees quality and consistent therapeutic performance. |
Competitive Magnesium Hydroxide prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615365186327 or mail to sales3@liwei-chem.com.
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Tel: +8615365186327
Email: sales3@liwei-chem.com
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Magnesium hydroxide means more here than just a chemical. Teams at our plant have produced this mineral day in and day out, weighing every order, tuning every batch, chasing the elusive goal of purity and consistency. We draw from raw sources others walk past, choosing only those that meet the standards demanded by the world’s strictest industries. Over years, we’ve learned that magnesium hydroxide’s true value emerges not from its formula, but from how it performs where it matters: wastewater plants, flue gas scrubbers, flame retardant production lines, pharmaceutical batches, pulp and paper mills, and more. That’s where our magnesium hydroxide makes a difference every time.
Different jobs call for different grades of magnesium hydroxide. Batch after batch, our QC lab delivers test results that help us decide where a particular lot should go. Some industries need a low heavy metal content—think of pharmaceuticals where every impurity matters, or flame retardant production where non-combustibility must never be compromised. We adjust crystal size, settling properties, and surface area based on past customer feedback and direct trials on-site. Regulatory standards lead our specifications: the material must meet not just purity, but reliability whether the customer blends it into a slurry for environmental protection or compresses it into tablets.
Our main grade, often favored by wastewater treatment facilities, sees a minimum Mg(OH)2 content above 99%. Particle size hovers in the 1–5 μm range—large enough for ease of filtration, fine enough for fast neutralization in acidic streams. Some clients in flue gas desulfurization look for a slightly coarser fraction, reducing dust loss and simplifying handling with automated feeds. Chloride and iron residues must stay below 0.05% because each extra fraction could lead to corrosion or downstream side reactions. In special orders for flame retardants, we keep moisture levels strictly in check, as excess water cuts productivity and raises costs in resin compounding.
Experience shows the problems that can crop up from seemingly trivial changes in feedstock or kiln temperature. Small shifts in calcining bring variations in whiteness, affecting optics in pulp applications. Changing slaking water alters reactivity, which in turn changes how much acid neutralization you get per unit weight. By tracing every step of the process and getting real feedback from the field, we continuously adjust our specifications, not just to meet but to improve on international standards.
Every shipment of magnesium hydroxide carries the legacy of millions of tons before it. In wastewater treatment, magnesium hydroxide buffers acidity steadily—unlike caustic soda, which can lead to fluctuating pH and burns. Operators at several plants found our product less hazardous to handle, with lower personnel training costs and less wear on dosing equipment. Magnesium hydroxide’s slow-release nature means that, after dosing, pH rises in a controlled way, minimizing the risk of overshooting which could kill beneficial microbes. Plant managers often mention a reduction in raw material consumption, since the increased alkalinity means fewer repeat dosing cycles.
Flue gas desulfurization stands as another area where the differences between products become obvious. We’ve partnered directly with power stations, experimenting with both fine and coarser grades. Our clients report that, compared to sodium-based neutralizers, magnesium hydroxide cuts sodium emission worries and supports ash reuse in construction, due to the absence of soluble salts. This may sound technical, but for plant operators and environmental officers, lower soluble salt loads simplify compliance checks and open new, revenue-generating options for ash.
Supplying flame retardant manufacturers gave us a new perspective. Here, dispersion and particle shape make all the difference. Consistent burning tests, performed in cooperation with customers, showed that platy, well-shaped hydrate particles spread better through polymer matrices, increasing smoke suppression and reducing flame spread. Clients focused on cable sheathing or wall insulation value our grades for their ease of mixing and reliability in passing UL or EN fire safety standards.
Our product also supports the pharmaceutical and food-additive sectors, though qualifying a lot for pharmaceutical use requires perhaps the tightest controls. The magnesium hydroxide used here undergoes additional purification after initial precipitation, a practice learned through repeated consultation with auditors and specialists from global pharma companies. Even the water used for washing crystals must meet drinking water standards, so traces left behind after drying don’t compromise the final product.
Not all magnesium hydroxide is alike. The mineral’s source and each processing step shape major differences. We noticed, after visiting customer sites, that product from synthetic routes using seawater precipitation yields a whiter, finer particle—an advantage in flame retardant and pulp markets, but sometimes less desirable for applications needing fast settling. For mining origin material, trace metals such as iron or manganese often slip through, affecting applications that can’t tolerate discoloration or side reactions.
We’ve invested in continuous improvement not out of marketing need but out of real feedback. Early batches over a decade ago sometimes showed clumping in slurry form, frustrating customers who wanted ready-to-use suspension without downtime. By changing drying and grinding operations, and through in-house milling tests using actual customer process fluids, we reduced agglomeration and increased dispersibility. Some competing products come straight from basic precipitation, dried and ground once, with wide particle size spread. That leads to erratic dosing performance and unexpected settling, causing extra maintenance or wasted product.
Offering bespoke grades has required us to upgrade not only machinery but our own understanding. A paper mill looking for higher brightness now gets magnesium hydroxide that is washed with higher-purity water and passed through more precise milling, boosting both reactivity in pulp bleaching and visual properties of the final sheet. On the other hand, a water treatment client with high throughput lines needs a coarser, drier material to avoid caking—so we tune the drying parameters and test sample slurries before releasing any batch for shipment.
We’ve seen acid spills, malfunctioning wastewater streams, and emergency scrubbing needs crop up unexpectedly. Magnesium hydroxide almost always takes on these challenges. Its safety margin stands above caustic soda or lime—in part because over-dosing stays rare, and in part because the likelihood of operator error drops when handling a less caustic, bulkier material. Incidents involving burns or hazardous fume releases fell at multiple customer locations after switching to our grade, a fact tracked in their safety logs. Plant downtime lessened, maintenance intervals stretched out, and fewer emergency callouts happened in the middle of the night.
Environmental sustainability also enters the story. Magnesium hydroxide leaves behind magnesium salts in treated water—less concerning for aquatic life compared to sodium or potassium byproducts. In our dealings with regulators, especially in coastal areas or those with tougher effluent disposal rules, this has proven a valuable argument. Even for solid waste disposal, the precipitate that forms after acid neutralization contains less mobile, less harmful ions—a factor not found with other alkalis.
Magnesium hydroxide easily binds with a broad range of acids and toxic ions. In heavy metal removal, for instance, plant operators find magnesium hydroxide enables cleaner separation due to the floppy, voluminous nature of the resulting sludge. We have seen days when our technical team worked side-by-side with municipal plant chemists, dialling in dosing rates pump by pump, getting pH and heavy metal removal just right. This boots-on-the-ground collaboration brings us insight we feed right back into product development.
Every chemical, even one as familiar to us as magnesium hydroxide, throws up challenges. Handling bulk powder remains a logistical hurdle for some clients—high humidity or cold spells can encourage clumping, making it hard to get reliable dosing. To solve this, we developed slurry concentrates supplied in tankers, ready for injection, which removes some of the trickiest steps from the customer’s process. Still, not all plants can receive slurry, and for them, we pack powder using liners and dehumidifiers, working with partners in transport to cut exposure to the elements.
Another hurdle pops up in mixing. Magnesium hydroxide isn’t truly soluble, so even in expert hands, it can settle out of water if left standing. Some clients need custom dispersants for pump stations, and we’ve gone out in person to trial dosing with anti-settling agents, adjusting the recipe based on feedback. Not every batch needs this—industrial customers with high-volume flows find simple agitation does the trick. But where fine particle retention really matters, our more refined, milled grades step in.
Global supply chains also put pressure on consistency. Sometimes, raw material ships late, or vessels get held up in customs. Over years, we built buffer stocks, even at the cost of tying up capital, to make sure and keep supply reliable for long-term contracts. Few things earn customer trust more quickly than making deliveries on time, especially for applications where an entire production line could stop for lack of a single chemical.
Our relationship with magnesium hydroxide never stands still. The daily run samples from our plant inform what we do the next day. We run comparison trials with competing products every few months, collecting numbers on reactivity, color, caking, dispersion, and real industrial output. Failures, as much as successes, drive strategy: if a test batch doesn’t pass a fire retardancy check, or if a client in Asia reports settling too fast in a pipeline, we strip the process back, trace each component, and correct with changes—sometimes big, sometimes just a tweak.
Recently, clients in microelectronics began asking for ever tighter controls on heavy metals. Our lab spent months collaborating with their suppliers, running ICP-MS and XRF analyses repeatedly until we hit the ultra-low thresholds needed. In response, we reconfigured some filtration machinery, added a new water purification line, and changed raw material procurement for these specialty lots. The aim never shifts: fewer defects, better outcomes, and above all, real reliability backed by data and direct customer feedback.
Customers, regulators, and peers have taught us lessons along the way. Close partnerships with wastewater plants led to improvements in storage silos, slurry agitators, and dosage control systems. Cooperation with food safety auditors and pharmacopoeia experts forced us to rethink both the traceability and cleanliness of our packaging line. Every regulation, every customer audit, every on-site troubleshooting call has driven us to sharpen our processes.
New trends keep emerging—low-carbon manufacturing targets, demand for biodegradable flame retardants, and pushback against persistent pollutants. Magnesium hydroxide continues to attract attention as an answer for cleaner chemistry, both for its main effect and its inert, benign byproducts. Our teams keep updating, learning from other fields and from innovative uses brought by clients we had never imagined a decade ago.
In our experience, magnesium hydroxide stands apart due to the balance it strikes—high capacity for neutralization, real gains in safety, cleaner byproducts, and the flexibility to serve many fields from industry to food. The difference lies not just in the chemical itself but in how it’s made, handled, measured, and delivered. Being the manufacturer doesn't just mean putting raw ingredients into a mixer but taking responsibility for how the final product performs in the real world. Magnesium hydroxide delivers real results because it’s backed by careful work, constant testing, and a direct line to the people who rely on it every day.
We look forward to every opportunity where magnesium hydroxide, made by hands and minds at our facility, brings real benefit. The needs and challenges of our customers, from wastewater plants to advanced manufacturing, remain the strongest influence on what we do next.