What sodium level counts as 'low-soda' reactive alumina?

Industry convention: Na2O < 0.10 wt% (often labeled 'LS' or 'LR') qualifies as low-soda reactive. Standard reactive alumina is typically 0.20-0.40 wt% Na2O, with low-soda grades pushing 0.05-0.09 wt%. The drop matters for any castable that must survive 1200-1700 C service in petrochemical, cement, or steel preheaters because sodium is the dominant driver of low-temperature mullite formation — and unwanted mullite pulls oxide ions out of the binding glass, weakening the silicate network.

Why does Na2O matter in castables even when the service temperature is high?

Sodium lowers the eutectic point of the alumina-silica matrix by 50-150 C and seeds beta-alumina (Na2O·11Al2O3) platelets during the burn-in cycle. Beta-alumina hydrates violently if the casting is cooled below 900 C with moisture present — a re-commissioning risk in preheater linings that have been idled for shutdowns. Low-soda reactive alumina eliminates this hydration risk entirely and lets the casting densify by direct corundum-corundum bridging rather than through a transient sodium-aluminate intermediate.

What's the role of specific surface area (BET) in reactive alumina selection?

BET should land between 1.5 and 4.0 m²/g for a casting-grade reactive alumina. Below 1.5 m²/g the powder is too dead — it will not participate in sintering until 1500 C+, by which point the cement phase has already fired out. Above 4.0 m²/g you get runaway shrinkage (5-7% on first firing vs 2-3% for BET 2.5), poor packing density in the green body, and water demand spikes that drive down castable flow while increasing porosity. For 60-85% alumina castables, BET 2.0-2.8 m²/g is the operational sweet spot.

How does reactive alumina differ from tabular alumina in a castable recipe?

Tabular alumina (T-60/T-64, sintered to ~1950 C, BET <0.5 m²/g) is the inert aggregate — it brings refractoriness and thermal-shock mass. Reactive alumina (BET 2-4 m²/g) is the sintering-active binder. Typical recipes run 60-75% tabular, 8-15% reactive, 5-10% calcium aluminate cement, with the balance being microsilica and dispersing alumina. Reactive alumina's surface energy drives a 100-200 C drop in the matrix densification temperature compared to using dead sintered filler alone — often the difference between a castable that matures at 1100 C versus one that needs 1400 C.

What calcination temperature produces a true reactive alumina (vs just 'ground calcined')?

True reactive alumina is rotary-kiln calcined between 1100 and 1300 C — high enough to drive off 99% of the residual OH but low enough to retain gamma-alumina content above 60%. Above 1350 C the transition to alpha-alumina passes 90% and reactivity collapses; below 1050 C you still have active alumina that over-hydrates in the castable mix water. The label 'reactive Al2O3' on a COA implies this gamma-alpha window. If your supplier can give you only an alpha-phase percentage ('alpha 95%') and no gamma content, you are looking at a dead calcined alumina, not a reactive grade.

Does reactive alumina interact with burned magnesia (MgO) at high temperature?

Above 1300 C, sodium-free reactive alumina reacts with MgO to form MgAl2O4 (spinel) at the grain boundary — this is the desired bond in magnesia-rich tap-hole, ladle, and cement-preheater castables. The reaction is volume-expansive (~5-8%), which is how MgO-bonded castables self-heal microcracks through 1300-1500 C thermal cycling. The catch: residual Na2O in standard reactive alumina poisons the spinel — it sequesters alumina into beta-aluminate instead, suppressing spinel yield by 30-60% until sodium is pushed below 0.10 wt%. This is one of the strongest cases for specifying low-soda reactive alumina specifically in MgO-bonded systems.

What's the dosing range for low-soda reactive alumina in a 70% alumina castable?

Typical recipes: 8-12% reactive alumina in 70% alumina castables for general industrial service; 12-15% in low-cement castables (LCC) where calcium aluminate cement drops below 5%. Below 7% the matrix fails to densify and the casting becomes permeable above 1000 C; above 15% the mix water demand goes non-linear and the casting can shrink-crack during the first firing. For vibrating-cast installations requiring self-flow, 9-11% is the operationally verified range.

How is low-soda reactive alumina used in shotcrete (gunning) mixes?

Shotcrete mixes need fast early-strength set (return-to-service in 8-24 h) plus low rebound loss. Low-soda reactive alumina at 6-9% by weight, paired with calcium aluminate cement at 12-15%, gives the right balance. Lower soda means the hydration heat does not spike prematurely — crews get 60-90 min working time without flash set, and rebound drops from typical 15% down to 6-9%. This is one of the few applications where reactive alumina is not just a sintering aid but a set modifier.

What's the difference between 'fine' and 'reactive' grades — are they the same?

No. Fine-grade calcined alumina (D50 = 5-15 micron, BET <0.5 m²/g) is ground calcined alumina — alpha-phase dominant, low surface area, used to plug pore structure. Reactive grade (BET 2-4 m²/g, gamma-content 60-90%, D50 1-5 micron) is calcined under controlled conditions to preserve metastable phases that drive sintering. A 5-micron fine grade may have one-tenth the surface area of a 5-micron reactive grade — the only correct way to tell them apart is BET and X-ray diffraction peak ratios, not particle size alone.

What storage / shelf-life considerations apply to reactive alumina?

Reactive alumina is hygroscopic — pickup of 1.5-3.0 wt% moisture over 90 days is normal under uncontrolled warehouse humidity (60-80% RH). Once moisture exceeds 3%, the powder begins to form bayerite (trihydrate) that disrupts castable set kinetics and produces steam-induced porosity during first firing. Best practice: store in sealed drums or foil-lined supersacks, keep warehouse RH below 50%, and rotate stock FIFO with 90-day maximum hold. For high-humidity tropics, climate-controlled storage is worth the cost if batch quality must be reproducible year-round.

ATH Flame Retardant for TPU (Thermoplastic Polyurethane) — Loading Level and Mechanical Properties | AluminaWorld

Q: Why does Na2O matter in castables even when the service temperature is high?

Sodium lowers the eutectic point of the alumina-silica matrix by 50-150 C and seeds beta-alumina (Na2O·11Al2O3) platelets during the burn-in cycle. Beta-alumina hydrates violently if the casting is cooled below 900 C with moisture present — a re-commissioning risk in preheater linings that have been idled for shutdowns. Low-soda reactive alumina eliminates this hydration risk entirely and lets the casting densify by direct corundum-corundum bridging rather than through a transient sodium-aluminate intermediate.

Q: What's the role of specific surface area (BET) in reactive alumina selection?

BET should land between 1.5 and 4.0 m²/g for a casting-grade reactive alumina. Below 1.5 m²/g the powder is too dead — it will not participate in sintering until 1500 C+, by which point the cement phase has already fired out. Above 4.0 m²/g you get runaway shrinkage (5-7% on first firing vs 2-3% for BET 2.5), poor packing density in the green body, and water demand spikes that drive down castable flow while increasing porosity. For 60-85% alumina castables, BET 2.0-2.8 m²/g is the operational sweet spot.

Q: How does reactive alumina differ from tabular alumina in a castable recipe?

Tabular alumina (T-60/T-64, sintered to ~1950 C, BET <0.5 m²/g) is the inert aggregate — it brings refractoriness and thermal-shock mass. Reactive alumina (BET 2-4 m²/g) is the sintering-active binder. Typical recipes run 60-75% tabular, 8-15% reactive, 5-10% calcium aluminate cement, with the balance being microsilica and dispersing alumina. Reactive alumina's surface energy drives a 100-200 C drop in the matrix densification temperature compared to using dead sintered filler alone — often the difference between a castable that matures at 1100 C versus one that needs 1400 C.

Q: What calcination temperature produces a true reactive alumina (vs just 'ground calcined')?

True reactive alumina is rotary-kiln calcined between 1100 and 1300 C — high enough to drive off 99% of the residual OH but low enough to retain gamma-alumina content above 60%. Above 1350 C the transition to alpha-alumina passes 90% and reactivity collapses; below 1050 C you still have active alumina that over-hydrates in the castable mix water. The label 'reactive Al2O3' on a COA implies this gamma-alpha window. If your supplier can give you only an alpha-phase percentage ('alpha 95%') and no gamma content, you are looking at a dead calcined alumina, not a reactive grade.

Q: Does reactive alumina interact with burned magnesia (MgO) at high temperature?

Above 1300 C, sodium-free reactive alumina reacts with MgO to form MgAl2O4 (spinel) at the grain boundary — this is the desired bond in magnesia-rich tap-hole, ladle, and cement-preheater castables. The reaction is volume-expansive (~5-8%), which is how MgO-bonded castables self-heal microcracks through 1300-1500 C thermal cycling. The catch: residual Na2O in standard reactive alumina poisons the spinel — it sequesters alumina into beta-aluminate instead, suppressing spinel yield by 30-60% until sodium is pushed below 0.10 wt%. This is one of the strongest cases for specifying low-soda reactive alumina specifically in MgO-bonded systems.

Q: What's the dosing range for low-soda reactive alumina in a 70% alumina castable?

Typical recipes: 8-12% reactive alumina in 70% alumina castables for general industrial service; 12-15% in low-cement castables (LCC) where calcium aluminate cement drops below 5%. Below 7% the matrix fails to densify and the casting becomes permeable above 1000 C; above 15% the mix water demand goes non-linear and the casting can shrink-crack during the first firing. For vibrating-cast installations requiring self-flow, 9-11% is the operationally verified range.

Q: How is low-soda reactive alumina used in shotcrete (gunning) mixes?

Shotcrete mixes need fast early-strength set (return-to-service in 8-24 h) plus low rebound loss. Low-soda reactive alumina at 6-9% by weight, paired with calcium aluminate cement at 12-15%, gives the right balance. Lower soda means the hydration heat does not spike prematurely — crews get 60-90 min working time without flash set, and rebound drops from typical 15% down to 6-9%. This is one of the few applications where reactive alumina is not just a sintering aid but a set modifier.

Q: What's the difference between 'fine' and 'reactive' grades — are they the same?

No. Fine-grade calcined alumina (D50 = 5-15 micron, BET <0.5 m²/g) is ground calcined alumina — alpha-phase dominant, low surface area, used to plug pore structure. Reactive grade (BET 2-4 m²/g, gamma-content 60-90%, D50 1-5 micron) is calcined under controlled conditions to preserve metastable phases that drive sintering. A 5-micron fine grade may have one-tenth the surface area of a 5-micron reactive grade — the only correct way to tell them apart is BET and X-ray diffraction peak ratios, not particle size alone.

Q: What storage / shelf-life considerations apply to reactive alumina?

Reactive alumina is hygroscopic — pickup of 1.5-3.0 wt% moisture over 90 days is normal under uncontrolled warehouse humidity (60-80% RH). Once moisture exceeds 3%, the powder begins to form bayerite (trihydrate) that disrupts castable set kinetics and produces steam-induced porosity during first firing. Best practice: store in sealed drums or foil-lined supersacks, keep warehouse RH below 50%, and rotate stock FIFO with 90-day maximum hold. For high-humidity tropics, climate-controlled storage is worth the cost if batch quality must be reproducible year-round.

What It Actually Is (And What It Is Not)

AluminaWorld is a Zibo, Shandong-based Chinese manufacturer of aluminum hydroxide (ATH, Al(OH)₃) supplied to TPU compounders in 25+ countries. Thermoplastic polyurethane (TPU) is a versatile elastomer used in wire and cable jacketing, charging cables, phone cases, automotive interior parts, and industrial hoses. TPU has excellent mechanical properties (high tensile strength 30-60 MPa, elongation 400-700%, abrasion resistance) but burns readily, with limiting oxygen index (LOI) of only 18-22%. For UL94 V-0 rating (required for most consumer electronics, EV, and industrial cable applications), TPU must be compounded with flame retardants.

ATH (aluminum hydroxide) is the dominant halogen-free flame retardant for TPU, replacing the older brominated and chlorinated flame retardants (decaBDE, TBBPA, SCCPs) that have been restricted under RoHS, REACH, and various consumer product safety regulations. ATH works through endothermic decomposition that releases water and absorbs heat, simultaneously cooling the polymer and diluting the combustible gas mixture. For TPU processing at 180-200°C, ATH is ideal because its decomposition temperature (200-220°C) is just above the processing window, providing flame retardancy without premature degradation during compounding.

The Hidden Mechanism Behind It

The ATH loading level required for UL94 V-0 rating in TPU depends on the test specimen thickness and the specific TPU grade. The table below summarizes typical loading levels for the three most common test conditions.

Below 50 phr loading, the ATH concentration is insufficient to absorb enough heat and produce enough water vapor to prevent sustained combustion. The TPU typically achieves V-2 rating (self-extinguishing but allows flaming drips). For V-0 rating, the LOI must exceed 28%, which requires the higher loading levels shown. The mechanical property trade-off is significant: 60 phr ATH reduces tensile strength by 30-50% and elongation at break by 40-60% compared to unfilled TPU, requiring careful compound design and surface treatment of the ATH.

Measured Numbers Across Grades

TPU Application	Test Thickness	ATH Loading (phr)	UL94 Rating Achievable
Charging cable jacket	0.6-0.8 mm	60-65	V-0
Wire insulation	1.0-1.6 mm	55-60	V-0
Industrial cable jacket	1.6-3.0 mm	50-55	V-0
Phone case / consumer	1.0-1.5 mm	55-60	V-0 (with synergist)
Automotive interior	1.0-2.0 mm	55-60	V-0 + low smoke

Industry-typical values are a starting point, not a guarantee. Your duty cycle, feed gas and service interval decide the final grade — always run a 50 kg trial before committing to a 20 t shipment.

Untreated ATH has a hydrophilic surface (high surface energy, polar Al-OH groups) that is poorly compatible with the relatively hydrophobic TPU matrix. The result is poor ATH dispersion, high compound viscosity, and severe reduction in mechanical properties at the loading levels required for V-0 rating. Surface treatment of ATH with a hydrophobic coating (vinylsilane, methacrylsilane, stearic acid) transforms the ATH surface to be more organophilic, improving compatibility with TPU.

AluminaWorld's ATH-TPU-2.0 grade is supplied with vinylsilane surface treatment at 0.8-1.2 wt% coating level. The vinylsilane group can also react with the TPU matrix during processing (especially in polyester-type TPU), providing covalent bonding that further improves mechanical retention. Compared to untreated ATH at 60 phr in TPU, vinylsilane-treated ATH preserves 70-80% of unfilled tensile strength (vs 50-60% for untreated) and 60-70% of elongation at break (vs 40-50% for untreated). The compound viscosity is also 20-30% lower, enabling higher loading or better processability.

Where It Earns Its Premium

Al2O3 · nH2O → Al2O3·nH2O (surface) + Al(OH)3 (bulk)

This is the working principle behind every number in the table above. Get the mechanism right and grade selection becomes a lookup; get it wrong and no supplier will save the run.

Magnesium hydroxide (MDH) is a higher-temperature alternative to ATH, with decomposition at 300-330°C vs 200-220°C for ATH. MDH also has higher endothermic heat absorption (1.45 kJ/g vs 1.17 kJ/g), giving better flame retardancy per phr. However, MDH is not suitable for TPU because the TPU processing temperature (180-200°C) is below the MDH decomposition temperature, so MDH acts as a passive filler rather than a flame retardant. The high MDH loading required for V-0 (60-70 phr) also drastically increases TPU compound viscosity, making extrusion difficult.

ATH is the clear choice for TPU because its decomposition temperature is just above the processing window. For higher-temperature polymers that process above 250°C (polyamide PA66, polypropylene PP, polybutylene terephthalate PBT), MDH is preferred because it survives the processing step and decomposes in the flame zone. For mixed polymer systems or applications that require both low smoke and high flame retardancy, a 50/50 ATH/MDH blend can be used to balance processing and performance.

The Product Across Variants

The optimal ATH particle size for TPU is 1-3 μm D50, with D90 below 10 μm. This range provides a good balance of flame retardancy, processability, and mechanical properties. Below 1 μm, the very fine ATH has a high specific surface area (5-10 m²/g) that dramatically increases compound viscosity, limiting the practical loading to 40-50 phr before extrusion becomes impossible. The very fine ATH also absorbs more processing stabilizers and antioxidants, reducing the long-term thermal stability of the TPU compound.

Above 5 μm, the larger ATH particles act as stress concentrators in the TPU matrix, reducing tensile strength and elongation at break. They also produce a rougher surface on the extruded cable jacket, which can be a quality issue for consumer-facing products. AluminaWorld's ATH-TPU-2.0 grade (D50 2.0 μm, D90 8 μm) is the industry standard for TPU wire and cable applications. For thin-wall applications (< 0.8 mm), the slightly finer ATH-TPU-1.5 grade (D50 1.5 μm) provides better surface finish.

Variant	Form	Grade	Key Spec	Typical Service
Standard	Spherical	Type 1	Bulk density	General drying
High strength	Spherical	Type 2	Attrition index	High-cycling beds
Bead	Extrudate	Type 3	Crush strength	Pressure swing
Fine	Powder	Type 4	Particle size	Coating and binder
Catalyst support	Spherical	Type 5	Pore volume	Catalyst carriers
Specialty	Custom	Type 6	Tailored spec	OEM applications

Working Time, Turnaround and Operating Discipline

Several synergists can boost the flame retardant efficiency of ATH in TPU, allowing lower ATH loading for the same V-0 rating. The most common synergists are zinc borate (2-5 phr), ammonium polyphosphate (5-10 phr), and melamine cyanurate (5-10 phr). These synergists promote char formation in the TPU, which combines with the alumina residue from ATH decomposition to form a more effective ceramic protective layer. The total flame retardant loading (ATH + synergist) can be reduced by 15-25% compared to ATH alone, with corresponding improvement in mechanical properties.

Zinc borate is the most common synergist in TPU/ATH compounds. At 3-5 phr loading, it reduces the ATH requirement from 60 phr to 50-55 phr for V-0 rating. The zinc borate also suppresses smoke generation during combustion, which is important for enclosed-space applications (rail car interiors, shipboard cable, EV battery cables). AluminaWorld does not supply zinc borate but can recommend Chinese suppliers and provide formulation guidance for combined ATH + synergist systems.

Charge the bed on a consistent mass basis, not on volume.
Keep inlet temperature inside the supplier window.
Record pressure drop at every turnaround.

Confirm feed analysis and moisture load.
Verify vessel fit and screen sizes.
Wet-test the loading procedure.
Sign off the first cycle baseline.

Procurement Specification

AluminaWorld operates dedicated ATH production lines in Zibo, Shandong, with annual capacity 80,000 metric tons including 5,000 MT of surface-treated grades. The company supplies ATH to TPU compounders and masterbatch producers in 25+ countries. Standard MOQ for TPU-grade ATH (ATH-TPU-2.0, vinylsilane-treated) is 1 metric ton, with 10-20 day lead time. Untreated grade MOQ 500 kg, 7-15 day lead time. Custom surface treatments (specific silane, coating level 0.5-3%) require 25-40 days for first orders.

Each shipment includes a Certificate of Analysis documenting Al(OH)₃ content, particle size distribution (D10/D50/D90), surface coating type and loading, moisture content, and impurity levels. AluminaWorld's ATH is REACH-registered for EU market access and complies with FDA 21 CFR 175.300 for indirect food contact applications (relevant for food processing equipment cable).

COA Parameter	Report Method	Typical Limit	Why It Matters	Acceptance
Surface area	BET	As specified	Capacity driver	>= 95% of nominal
Bulk density	Tamped	As specified	Filling and mass transfer	Within tolerance
Particle size	Sieve / laser	Grade window	Pressure drop	No fines excess
Crush strength	ASTM D5757	Grade minimum	Attrition loss	>= 95% of spec
Moisture	Loss on ignition	Low	Prevents caking	Below limit
Appearance	Visual	Free flowing	Handling	No lumps or fines

Storage, Shelf Life and Inventory Hygiene

For technical specifications, COA, or a quote for TPU-grade ATH, contact AluminaWorld via WhatsApp at +86 133 2522 2240 or by email at barry@okkinc.com.

55-65 phr (sole FR). 60-65 phr for 0.6-0.8mm cable jacket. 50-55 phr for 1.6-3.0mm industrial jacket. Below 50 phr = V-2 only.

Keep drums sealed until the day of charging.
Rotate stock FIFO and quarantine any lot with a broken seal.
Re-test bulk density and moisture before loading a full vessel.

Store in the original sealed container, off the floor.
Target a cool, dry, ventilated store away from direct sunlight.
Use first-in first-out and log every lot you open.

Total Cost of Ownership

Vinylsilane coating: better dispersion, 20-30% lower viscosity, 70-80% tensile retention (vs 50-60% untreated). Coating level 0.8-1.2 wt% standard.

ATH (200-220°C decomp) fits TPU (180-200°C processing). MDH (300-330°C decomp) too high for TPU, acts as filler only. Use ATH for TPU, MDH for PA66/PP/PBT.

Cost Component	Standard Grade	Engineered Grade	What Changes
Purchase price per tonne	Lower	Higher	Upfront premium
Service life per charge	Shorter	Longer	Fewer changeouts
Product loss to carry-over	Higher	Lower	Less product waste
Unplanned shutdown frequency	More frequent	Less frequent	Less downtime
Lab and QA cost per batch	Higher unit cost	Lower unit cost	Fewer deviations
Total cost per tonne of product	Higher	Lower	Payback on volume

The payback shows up in the second and third changeout, not the purchase order. Model your own numbers on the duty cycle you actually run, then compare the landed cost per tonne of finished product rather than the price per tonne of adsorbent.

1-3 μm D50, D90 < 10 μm. Below 1 μm: too high viscosity. Above 5 μm: stress concentrator, rough surface. AluminaWorld ATH-TPU-2.0 is industry standard (D50 2.0 μm).

Zinc borate 3-5 phr (most common), ammonium polyphosphate 5-10 phr, melamine cyanurate 5-10 phr. Total FR loading reduced 15-25%.

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Next Steps — Get a Sample or Talk to Our Engineers

Surface-treated MOQ 1 MT, 10-20 days. Untreated MOQ 500 kg, 7-15 days. Custom silane 25-40 days. Samples 5-25 kg in 3-5 days.

AluminaWorld supplies vinylsilane-treated ATH for halogen-free TPU cable. UL94 V-0 achievable at 55-65 phr. ISO 9001. 25+ countries.

We hold stock on hand and ship within 15-25 days of order confirmation. If you need a custom specification, a blended grade or a trial lot, tell us the duty cycle and we will run the sample from our own production line.

Talk to our engineers

WhatsApp / Tel: +86 133 2522 2240

Email: barry@okkinc.com

Factory: Zibo Industrial Park, Shandong, China

Get a Quote

Tell us the product, grade and quantity. We reply within 12 hours with price, lead time and a free sample offer.

✓ 1-2 kg free sample within 3 days
✓ COA and technical datasheet with every shipment
✓ FOB / CIF / DDP to USA, Europe, Middle East, South America
✓ Engineering consultation on grade selection and loading

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