Ten questions buyers ask before they specify a grade

It is a vulcanising agent and a vulcanisation activator — not an accelerator and not a filler. MgO controls scorch time, raises crosslink density and neutralises the acidic by-products of vulcanisation. If you dose it as if it were a filler, the compound will not cure the way your formulation expects.

Bulk density. Light grades have low bulk density and high specific surface area — they react faster and occupy more volume per kilogram. Heavy grades are dense and free-flowing. Light is the conventional choice for rubber; heavy suits technical ceramics and volume-limited processes. A container of light material fills by volume long before it fills by mass, so quote by tonne and plan by cubic metre.

Active MgO has a high specific surface area — ZH-M600 runs at 175 m²/g minimum and ZH-V150 at 150 m²/g. Specify it when reactivity is what your formulation is short of: adsorbents for harmful gases, electronic components, inks, and rubber or plastics where it functions as both filler and reinforcing agent. If the constraint is purity rather than reactivity, ZH-V2 or ZH-V3H is the right choice instead.

MgO runs from 99.7% (ZH-V2) and 99.5% (ZH-V3H) down to industrial grade. Mg(OH)₂ is supplied in high purity, surface-modified, flame-retardant and food/pharma grades. MgCO₃ in high purity, basic, industrial, light, heavy and food/pharma grades. Purity, particle size distribution, bulk density, specific surface area and surface treatment are all adjustable — send the target values and our laboratory will run a trial batch.

Typical. The guaranteed specification is on the technical data sheet for the grade, and the values your batch is released against are the ones tested and printed on its certificate of analysis.

Yes, with the COA of the lot the sample came from. Tell us the test you intend to run — a cure curve, an LOI, an adsorption capacity, a UL-94 rating — and we will size the sample to that test rather than sending a token 50 g.

No. A sample comes from current stock and your order would come from a fresh lot. Both are released against the same grade specification, and we send the COA of the lot your sample came from.

Yes, once the laboratory has made the trial batch. Tell us the target parameters and we will tell you how long it takes.

Sealed bag with the lot number and the TDS, dispatched by courier with the COA for the sampled lot.

Minimum order quantity, lead time and packing depend on the grade and the order size — confirm them with us on an inquiry.

Minimum order quantity, lead time and packing depend on the grade and the order size — confirm them with us on an inquiry. Custom grades take longer — we will tell you when we see the specification.

EXW, FOB, CIF, DAP and FCA are all available. The ports we normally ship from need client confirmation before we publish them.

25 kg multi-wall kraft bags with PE inner liner, palletised; 500 kg and 1,000 kg FIBC on request; neutral bags and custom print available. Pallet and container configuration depends on the grade’s bulk density — packing depends on the grade and the order size, so confirm it with us on an inquiry. No loading figure is published on the site (rule H7).

No. Prices for these products move with specification, tonnage and market. Send the grade, application and tonnage and we will quote against your specification.

Yes. Independent inspection before loading is supported on request; you nominate the inspection company and the scope. Every batch is released against its own certificate of analysis in any case, and the tested value — not a range — is reported for every parameter.

Lead, arsenic, cadmium and mercury, tested per batch on food and pharma lots, with the measured value on the COA.

We hold ISO 9001 for the design, development, manufacture and sales of magnesium compounds. No certificate number, issuing body or validity date is published until the client supplies them. Other certifications, including REACH registration, food-contact and pharmacopoeia documentation, halal and kosher, are confirmed per destination market before quotation — ask our team for the current document set.

We issue a COA with every batch and send the current document set on request. Coverage depends on your destination — tell us where you will sell the finished product and we will confirm what we can supply before you order.

MgO is a mild alkali: it neutralises acidic wastewater from electroplating, metallurgy, chemical plants and mining, and precipitates heavy metals as hydroxides at the pH you need. Because the alkalinity is mild and the reaction is self-limiting, overshoot is far harder to cause than with caustic soda, and the resulting sludge dewaters more easily than lime sludge.

Mg(OH)₂ decomposes endothermically above 300 °C, releases water vapour and leaves a magnesium oxide char. It contains no halogen, so nothing toxic or corrosive is given off; smoke density stays low; and it is non-toxic and odourless in handling. Surface-treated grades are compatible with polyolefins and elastomers, so the mechanical properties you designed for largely survive the loading.

A MgO slurry absorbs SO₂ from the flue gas, forming magnesium sulfite and sulfate. The advantage over the limestone method is that the process is a cycle rather than a disposal route: magnesium can be recovered and returned to the process, so the desulfurisation product has value instead of becoming waste. Efficiency and recovery figures need measured values before we publish them.

Yes. Mg(OH)₂ converts to MgO on firing, and because it starts at high purity the oxide inherits it. It is chosen when the hydroxide route disperses better in the process than a carbonate or a pre-calcined oxide. ZH-H1 and ZH-H2 are the grades we ship for this.

Sealed, dry, off the floor, in delivery order. Magnesium compounds pick up moisture and CO₂ from air; an open bag in a humid warehouse is a spoiled batch.