Magnesium Remover MGR · Demagging Flux for Aluminum
For when the scrap brings more magnesium than the alloy allows. Wrought scrap is full of magnesium that the casting alloys made from it cannot carry. Even after NADCA raised the 380 and A380 limit from 0.10% to 0.30% in 2006, a melt built on wrought scrap can land above it. A demagging flux converts that excess magnesium into a compound that leaves with the dross.
Chelora Chemicals is a magnesium remover flux supplier and sourcing partner serving secondary smelters, remelters and die casters across the United States, with a batch COA and SDS, and the composition data your air permit needs, on every consignment.
- Product type
- Demagging flux
- Function
- Lowers magnesium content
- Chemistry
- Fluoride-based reaction with Mg
- Product formed
- MgF₂ into the dross
- Metal
- Aluminum, mainly scrap-based melts
- Form
- Powder or granules
- Alternative to
- Chlorine gas demagging
- US air rule
- Subpart RRR fluxing
- Documentation
- Batch COA & SDS
Note: demagging is fluxing under EPA's rule. Subpart RRR names magnesium removal in its definition of fluxing. Check your permit position before you start.
How magnesium leaves the melt
Magnesium is more reactive than aluminum, so it is the first to give up its place to a fluoride or chloride.
Why it matters: Mg and Si together form Mg₂Si. In casting alloys that are not meant to carry magnesium, the excess embrittles the casting, which is why the limits are tight
What magnesium remover is and does
Magnesium remover, often sold as MGR, is a demagging flux: a solid flux that lowers the magnesium content of molten aluminum. The classic chemistry is the fluoride route, in which aluminum fluoride reacts with magnesium — 2AlF₃ + 3Mg → 3MgF₂ + 2Al — so the magnesium leaves as magnesium fluoride and the aluminum it displaces goes back into the melt.
The need comes from scrap. Wrought alloys carry magnesium by design, and a large share of casting alloys are made from scrap. Casting alloys such as 380 and A380 cap magnesium, because in a silicon-rich alloy excess magnesium forms Mg₂Si and embrittles the casting. The traditional alternative is chlorine gas, where magnesium leaves as magnesium chloride; a solid flux avoids handling chlorine gas on site.
Before you specify a demagging flux
- Know your starting and target magnesium. The dose depends on how much has to come out.
- It is reactive fluxing. 40 CFR Part 63 Subpart RRR names demagging in its definition of fluxing.
- Fume control. Fluoride and chloride fluxes evolve fume at the melt; extraction is part of the process.
- Dross handling. The magnesium ends up in the dross, so plan its handling and disposal.
Handling character
Magnesium remover must go into the melt dry, with fume extraction in place. Details in the Safety section.
| Parameter | Typical value |
|---|---|
| Active fluoride content | Per agreed specification |
| Chloride carrier | Per grade |
| Moisture | Per grade specification — kept low |
| Form | Powder or granules |
| Particle size | Per agreed specification |
| Dosing guide | Supplied with the grade |
Important: the figures above are indicative of commercial material and are offered for planning only. The batch certificate of analysis is the governing document.
| Property | Value |
|---|---|
| Physical form | Powder or granules |
| Function | Magnesium removal |
| Reaction (fluoride route) | 2AlF₃ + 3Mg → 3MgF₂ + 2Al |
| Reaction (chlorine route) | Mg + Cl₂ → MgCl₂ |
| Product | Magnesium compound in the dross |
| Hygroscopic | Store sealed |
| US air rule | Subpart RRR — fluxing |
Reactions are the standard demagging chemistries. Composition, dose per unit of magnesium removed and application temperature are grade-specific and stated in the producer's COA and dosing guide. Treat the table as orientation, not as a specification.
Where magnesium remover is used
Secondary aluminum, remelting and die casting from scrap.
Secondary smelters
Producing casting alloys such as 380 and A380 from mixed scrap, where wrought content pushes magnesium over the limit.
- Dose matched to Mg reduction
- Composition data for permits
- Batch COA
Die casters remelting
Die casters remelting returns and purchased scrap, correcting magnesium before the holding furnace.
- Small-pack grades
- Dosing guide supplied
- Batch traceability
Reverberatory & rotary furnaces
Solid demagging flux worked into the melt where chlorine gas injection is not installed.
- Powder or granular grades
- Application guidance shared
- Trial packs available
Fume & dross control
Fluoride and chloride fluxing evolve fume and produce magnesium-bearing dross.
- SDS with every batch
- Exposure controls are yours
- Dross handling discussed
Air permit support
Demagging is fluxing under Subpart RRR; we supply the composition data your environmental team needs.
- Full composition on request
- Grade change notified
- Broker coordination
Scheduled supply
Melt treatment runs every shift, so steady call-off supply matters more than spot price.
- Annual contracts with call-off
- Price held across the contract
- Second source held in reserve
Delivered to US plants and ports
We ship magnesium remover to nominated delivery points across the United States. The regions below are destinations we serve — Chelora Chemicals is a sourcing and supply partner, not a US manufacturer, and does not hold US stock.
Gulf Coast
The largest US chemical cluster, and the usual entry point for bulk consignments.
- Houston & Galveston, TX
- New Orleans & Baton Rouge, LA
- Mobile, AL
Northeast
Container and bulk delivery into the mid-Atlantic and New England manufacturing belt.
- Newark & Elizabeth, NJ
- Philadelphia, PA
- Boston, MA
Southeast
Port-side delivery for the Carolinas, Georgia and Florida processing plants.
- Savannah, GA
- Charleston, SC
- Jacksonville, FL & Norfolk, VA
Midwest & Great Lakes
Inland rail and truck forwarding from the nearest coastal port to the industrial Midwest.
- Chicago, IL
- Detroit, MI
- Cleveland & Columbus, OH
West Coast
Pacific routing for West Coast processors and formulators.
- Los Angeles & Long Beach, CA
- Oakland, CA
- Seattle & Tacoma, WA
Southwest & Mountain
Inland delivery to interior states, forwarded from the Gulf or Pacific gateway.
- Dallas–Fort Worth, TX
- Phoenix, AZ
- Denver, CO
Importing into the United States
A magnesium remover flux is a chemical mixture, so TSCA looks at each component rather than the product name. Under TSCA section 13 the importer of record, or its authorized agent, must certify to US Customs and Border Protection that each shipment either complies with TSCA or is not subject to it. We confirm the Inventory status of every component with the producer and agree in writing who files that certification before the first consignment moves.
Which party carries that duty follows the Incoterm. On FOB, CFR or CIF terms it is usually the US buyer; on DDP terms it can be the seller or its agent. Safety data sheets and labels are supplied to OSHA's updated Hazard Communication Standard, and the grade-specific transport transport documentation is prepared before booking.
| Item | How it works |
|---|---|
| Delivery points | Any nominated US plant, terminal or port of discharge |
| Incoterms quoted | FOB · CFR · CIF · DDP |
| Importer of record | Agreed in writing before the first shipment |
| TSCA certification | Section 13 positive certification filed at entry |
| Documentation | Batch COA, SDS, packing list, certificate of origin |
| Pack formats | 25 kg bags or drums |
Note: regional coverage describes where we deliver, not where we hold inventory. Lead time depends on producer scheduling and ocean transit to your nominated US port — we confirm both in the quotation.
How we supply magnesium remover
Chelora Chemicals is a magnesium remover supplier and sourcing partner, not a manufacturer. We place your order with a qualified producer whose grade fits your furnace and how much magnesium you need to remove.
The first questions are your starting and target magnesium, and your melt size. Demagging flux is consumed in proportion to the magnesium removed, so those numbers set the dose and the cost per ton of metal.
The second is your permit. Demagging is named in Subpart RRR's definition of fluxing, and the composition data you need to assess it comes with the grade, not after a request.
- Dose tied to your magnesium numbers. Starting level, target and melt size, before we quote.
- Composition data for your air permit. Supplied with the grade.
- Solid alternative to chlorine gas. For plants without, or moving off, chlorine injection.
- Moisture-barrier packaging. Damp flux is a hazard on molten metal.
- Trial packs before a contract. Measure the Mg drop on your own melt.
- Batch traceability to the producing plant. Full chain of custody documentation on request.
Bagged or drummed
Moisture-barrier bags or lined drums, with full documentation.
25 kg moisture-barrier bags
Poly-lined bags, the standard unit for flux products.
Lined drums
Lined, resealable drums for use from the container at the furnace.
Sealed packs in cartons
Tablet grades sealed in moisture-barrier packs and cartoned.
Small trial quantities
Small packs for trial on your alloy before a commercial order.
Incoterms to suit you
Quoted on the Incoterm your purchasing team works to.
Scheduled deliveries
Annual volume released against your melt schedule.
Reactive fluxing, with the fume that comes with it
Demagging flux is a reactive fluoride-based product used on molten metal. The hazards that matter most are fume evolved during the reaction, the toxicity of fluoride salts, and moisture — damp flux on molten aluminum can erupt. The summary below is orientation only; the safety data sheet supplied with your batch is the authoritative document.
Classified hazards
Cl⁻Chloride salt base: irritating to eyes; dust irritates the respiratory tract.F⁻Fluoride-bearing grades: harmful or toxic if swallowed; classification depends on fluoride content.FumeFumes are evolved at melt temperature: use local exhaust ventilation at the furnace.H₂OMoisture in flux contacting molten aluminum can cause violent steam eruption.SDSThe GHS classification is grade-specific and set out in the batch SDS.
The US air rule worth knowing. EPA's secondary aluminum NESHAP, 40 CFR Part 63 Subpart RRR, defines reactive fluxing as any gas, liquid or solid flux, other than cover flux, that results in a hazardous air pollutant emission, and it defines cover flux as salt added to the melt surface without surface agitation to prevent oxidation. Foundries, die casters and extruders melting only clean charge, customer returns or internal scrap are outside the definition of a secondary aluminum production facility. Whether your fluxing practice brings you inside the rule is a determination for you and your permitting authority; we supply the composition data you need to make it.
Storage
Store in sealed original packaging in a dry, covered area, off the floor and away from food and feedstuffs. Salt fluxes are hygroscopic: reseal part-used containers immediately, because flux that has picked up moisture both performs worse and creates a steam hazard when it meets molten metal. Rotate stock first in, first out.
Handling
Handle with gloves, eye protection and dust control, and apply only with dry, preheated tools. Never add damp or cold material to a melt. Fumes evolve at melt temperature, so furnace-side local exhaust ventilation is appropriate. Follow the exposure controls set out in the batch SDS and your own foundry safety program.
Transport
Most chloride-based fluxes ship as non-dangerous goods, but that is a grade-level question, not a product-name one: fluoride content can bring a formulation into a toxic or environmentally hazardous class. We confirm and document the classification for your specific grade, packaging and destination before booking.
Every batch, documented
We verify documentation before dispatch so there are no surprises at your incoming-goods bench.
Specification agreed
Alloy family, melt temperature, application method and the grade chemistry confirmed against your process before the order is placed.
Producer batch testing
The producing plant tests each batch against the agreed specification before release.
Documentation review
COA, SDS, TSCA position and transport classification checked by our desk before the shipment is booked.
Traceable dispatch
Each shipment is traceable to its producing batch, with full chain-of-custody records on request.
Why scrap brings the magnesium
Most aluminum casting alloys are made, at least in part, from scrap, and much of that scrap is wrought: sheet, extrusions, cans. Wrought alloys use magnesium deliberately for strength and corrosion resistance, so a melt built on them inherits magnesium the casting alloy does not want.
In silicon-rich casting alloys, magnesium combines with silicon to form Mg₂Si, and above the alloy's limit that embrittles the casting. NADCA raised the magnesium maximum for 380 and A380 from 0.10% to 0.30% in 2006, which helped, but did not remove the need to demag high-magnesium melts.
There are two ways to take it out. Chlorine gas injected into the melt converts magnesium to magnesium chloride; it is effective but means handling chlorine on site and controlling the off-gas. A solid fluoride-based flux does the job without a chlorine supply. Both are fluxing under EPA's secondary aluminum rule, and both need fume control.
We do not publish operating process parameters here; this is background only. Full technical documentation accompanies every shipment, and any process-specific detail you need is best confirmed directly with our technical desk.
| Product family | Aluminum demagging flux |
|---|---|
| Function | Magnesium removal |
| Fluoride route | 2AlF₃ + 3Mg → 3MgF₂ + 2Al |
| Chlorine route | Mg + Cl₂ → MgCl₂ |
| Typical use | Scrap-based casting alloys |
| US air rule | Subpart RRR fluxing |
Related foundry & melt-treatment products
Other aluminum melt-treatment inputs supplied from the same desk.
Magnesium remover, answered
What is magnesium remover (MGR)?
How does a demagging flux remove magnesium?
Why does magnesium need to be removed?
What is the alternative to a demagging flux?
How much flux do I need?
Is demagging covered by EPA rules?
Does demagging affect the dross?
What safety precautions apply?
How should magnesium remover be stored?
Do you manufacture magnesium remover?
Get a quote on magnesium remover
Tell us your alloy, melt size, starting magnesium and target. We will match a grade, estimate the dose, and send the composition data your environmental team needs alongside the quote.