Aluminum Master Alloys Grain Refiners · Modifiers · Hardeners
How a melt gets an element it cannot easily take on its own. Titanium, manganese, chromium and iron melt far above aluminum, and strontium reacts too readily to add cleanly. Pre-alloyed into aluminum at a known percentage, each one dissolves at normal melt temperatures, at a predictable recovery, in amounts as small as a few hundredths of a percent.
Chelora Chemicals is an aluminum master alloy supplier and sourcing partner serving foundries, casthouses and die casters across the United States. We supply grain refiners, modifiers and hardeners in waffle ingot and rod form, with a batch chemical analysis on every consignment.
- Product type
- Aluminum-based master alloys
- Grain refiners
- Al-5Ti-1B · Al-Ti
- Modifiers
- Al-10Sr
- Conductivity treatment
- Al-B
- Hardeners
- Al-Si · Al-Mn · Al-Cu · Al-Fe · Al-Cr · Al-Zr · Al-Ni
- Forms
- Waffle ingot · coiled rod · cut rod
- Rod diameter
- 9.5 mm (3/8 in) standard
- Packaging
- Pallets, coils or boxes
- Documentation
- Batch chemical analysis
Note: specify the form with the grade. The same Al-5Ti-1B chemistry comes as coiled rod for continuous in-line feeding or as waffle for furnace and ladle additions. The form is decided by how you add it.
Three jobs a master alloy does
The same product family covers structure control and chemistry control.
Why it matters: grain refiner and modifier additions are tiny but decisive. They are measured in hundredths of a percent and they set the casting's structure, so consistency between lots matters more than price
What master alloys are and do
A master alloy is an aluminum alloy rich in one element, made so that element can be added to a melt cleanly. Many alloying elements are awkward on their own: they melt far above aluminum, dissolve slowly, oxidize or react, or are needed in amounts too small to weigh out as pure metal. Pre-alloyed at a known percentage, they dissolve at normal melt temperatures with predictable recovery.
The family splits into three jobs. Grain refiners such as Al-5Ti-1B seed fine, equiaxed grains, which reduces hot cracking in ingot and improves feeding and properties. Modifiers such as Al-10Sr change eutectic silicon in aluminum-silicon alloys from coarse plates to a fine fibrous form. Hardeners bring silicon, manganese, copper, iron, chromium, zirconium or nickel up to the alloy specification.
What to tell us when you order
- The grade. Element and nominal percentage, for example Al-5Ti-1B, Al-10Sr or Al-50Si.
- The form. Coiled rod for continuous in-line feeding; waffle or cut rod for furnace and ladle additions.
- Your alloy. Some refiner chemistries lose efficiency in high-silicon or zirconium-bearing alloys.
- Impurity limits. Iron and other residuals that your alloy specification cannot tolerate.
Handling character
Master alloy additions must be dry and preheated. Moisture on cold metal added to a melt is a steam explosion risk. Details in the Safety section.
| Parameter | Typical value |
|---|---|
| Principal element | Nominal %, within agreed range |
| Second element (e.g. B in Al-Ti-B) | Per grade |
| Impurities | Fe, Si and others per agreed limits |
| Form & size | Waffle, coiled rod or cut rod |
| Microstructure (refiners) | Particle size and distribution per grade |
| Surface | Clean, dry, free of oil |
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 | Waffle ingot, coiled rod or cut rod |
| Matrix | Aluminum |
| Standard refiner | Al-5Ti-1B |
| Standard modifier | Al-10Sr |
| Rod diameter | 9.5 mm (3/8 in) standard |
| Addition level | Element-specific; often hundredths of a percent |
| Recovery | Predictable at normal melt temperature |
Grade names give nominal compositions; actual element content, impurity limits and refiner particle characteristics are set by the producer and stated on the batch analysis. Grain refining efficiency depends on more than chemistry alone. Treat the table as orientation, not as a specification.
Where master alloys go to work
Casthouses, foundries, die casters and conductor producers.
DC casthouses
Al-Ti-B rod fed continuously into the launder ahead of the mold to refine grain and reduce ingot cracking.
- 9.5 mm coiled rod
- Consistent lot-to-lot response
- Feeder-compatible coils
Shape casting foundries
Al-Sr modification and Al-Ti-B refinement of aluminum-silicon casting alloys for better feeding and properties.
- Al-10Sr waffle or rod
- Refiner suited to alloy
- Batch chemical analysis
Electrical conductor aluminum
Al-B boron treatment precipitates titanium, vanadium, chromium and zirconium as borides to raise conductivity.
- Al-B grades
- Low-impurity specification
- Analysis per lot
Alloy chemistry correction
Hardeners bring silicon, manganese, copper, iron, chromium, zirconium or nickel up to specification.
- Al-Si, Al-Mn, Al-Cu
- Al-Fe, Al-Cr, Al-Zr, Al-Ni
- Nominal grades on request
Secondary & remelt
Remelters adjusting scrap-based melts to a target alloy with predictable, measurable additions.
- Waffle for easy weighing
- Clear nominal percentages
- Recovery guidance
Import & tariff coordination
Aluminum products can fall within the Section 232 tariff program; we confirm the HTS position and duty at quotation.
- HTS confirmed per form
- Duty stated in the quote
- Broker coordination
Delivered to US plants and ports
We ship aluminum master alloys 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
Under TSCA an alloy is treated as a mixture of its constituent elements, so each element is checked against the Inventory. Under TSCA section 13 the importer of record, or its authorized agent, must certify to US Customs and Border Protection that each shipment complies with TSCA or is not subject to it, and we agree in writing who files that certification. Aluminum products can also fall within the Section 232 aluminum tariff program, most recently amended effective April 6, 2026, so we confirm the HTS classification and duty position for your grade and form in the quotation rather than assume it.
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 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 | Palletized waffle, coils or boxed cut rod |
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 aluminum master alloys
Chelora Chemicals is an aluminum master alloy supplier and sourcing partner, not a manufacturer. We place your order with a qualified producer whose grade, form and impurity limits fit your alloy and your addition method.
For grain refiners and modifiers, what you are buying is a consistent response in your melt, not just a percentage on a certificate. We ask what alloy you refine, because refiner efficiency can drop in high-silicon and zirconium-bearing alloys, and we keep you on the same producer between lots.
For hardeners, the questions are the nominal grade, the form that suits how you weigh and add, and the impurities your specification will not tolerate. We also confirm the tariff position up front, because on aluminum products the duty can matter as much as the price.
- Grade and form specified together. Coiled rod for in-line feeding, waffle or cut rod for batch additions.
- Alloy reviewed before quoting. Refiner chemistry matched to silicon and zirconium content.
- Batch chemical analysis with every lot. Principal element, secondary element and impurities.
- Same producer between lots. Grain refiner response is consistent only if the source is.
- Tariff position confirmed at quotation. HTS classification and Section 232 status stated, not assumed.
- Batch traceability to the producing plant. Full chain of custody documentation on request.
Waffle, coil or cut rod
Palletized waffle ingot, coiled rod for feeders, or boxed cut rod, with full documentation.
Breakable waffle, palletized
Notched waffle plates that break into weighed pieces for furnace and ladle additions.
9.5 mm rod coils
Continuous rod for automatic in-line feeders at the casting station.
Boxed cut lengths
Rod cut to length and boxed for measured manual additions.
Strapped pallets
Waffle and boxes strapped on pallets for container shipment.
Incoterms to suit you
Quoted on the Incoterm your purchasing team works to.
Scheduled deliveries
Annual volume released against your casting schedule.
Solid metal going into molten metal
In massive form, aluminum master alloys are stable solids. The hazard sits at the furnace: any moisture on metal added to a melt — condensation on a cold coil or waffle, damp packaging, wet tools — can cause a violent steam explosion. Fines and dust from cutting can be combustible, and individual alloying elements carry their own exposure limits. The summary below is orientation only; the safety data sheet supplied with your batch is the authoritative document.
Classified hazards
H₂OMoist or cold additions to molten aluminum: risk of violent steam explosion.HeatPreheat waffle and rod before adding; never add wet material.DustFines and dust from cutting or grinding may be combustible.PELAlloying elements carry their own exposure limits during melting.SDSClassification per grade and form in the batch SDS.
The foundry rule that matters most. Water and molten aluminum must never meet. Master alloys shipped by sea can arrive cold and pick up condensation when moved into a warm melt shop, so store them in the dry, let them come to shop temperature, and preheat every addition before it touches the melt. Rod fed by an in-line feeder should be kept dry on the coil.
Storage
Store indoors in a dry area, off the floor, in original packaging until use. Avoid moving cold metal straight into a warm, humid shop where it will sweat. Keep coils covered and dry. Segregate by grade so additions are never mixed up.
Handling
Preheat waffle pieces and cut rod before adding them to the melt, and add with dry tools. Wear a face shield, heat-resistant gloves and protective clothing at the furnace. Control dust where material is cut or ground. Follow the batch SDS and your own foundry safety program.
Transport
Master alloys in massive form — waffle ingot and rod — generally ship as non-dangerous goods. Finely divided forms are classified on their own properties. We confirm and document the classification for your specific grade, form, 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.
Grain refiners: consistency over chemistry
A grain refiner works by putting nucleating particles into the melt. In the standard Al-5Ti-1B grade those are titanium diboride particles together with titanium aluminide, and each one can seed a grain as the metal solidifies. More effective nuclei mean finer, equiaxed grains, which reduces hot cracking in DC ingot, improves feeding in castings and evens out properties.
That is why two refiners with the same nominal 5% Ti and 1% B can behave differently. Particle size, distribution and cleanliness decide how many effective nuclei you get, and chemical composition is only part of the story. It is also why refiner efficiency depends on the alloy: high silicon and zirconium can both reduce it, and grades exist for those cases.
For a buyer, the practical consequence is simple. Pick a grade that suits your alloy, prove it on your process, and then keep the source consistent, because the response you qualified belongs to that producer's process as much as to the grade name.
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-based master alloys |
|---|---|
| Grain refiners | Al-5Ti-1B · Al-Ti |
| Modifier | Al-10Sr |
| Conductivity treatment | Al-B |
| Forms | Waffle ingot · coiled rod · cut rod |
| US import note | Section 232 status confirmed per HTS line |
Related foundry & melt-treatment products
Other aluminum melt-treatment inputs supplied from the same desk.
Aluminum master alloys, answered
What is a master alloy?
What is Al-5Ti-1B used for?
What does Al-10Sr do?
What is Al-B used for?
What are hardener alloys?
Should I buy rod or waffle?
Why does the same grain refiner grade perform differently?
Are master alloys subject to US tariffs?
What safety precautions apply?
Do you manufacture master alloys?
Get a quote on aluminum master alloys
Tell us the grades and forms you use, your alloy, monthly volume and any impurity limits. We will match a producer, send a sample analysis, and quote with the HTS classification and duty position stated.