Sodium aluminate (CAS 1302-42-7, also 11138-49-1) is an alkaline aluminum salt that coagulates water while adding alkalinity, dosed at 2 to 60 mg/L (ppm) as Na2Al2O4 in drinking water (Australian Drinking Water Guidelines, NHMRC). Each mg/L of an 88 % product raises alkalinity by 0.54 mg/L, which makes it a primary coagulant for low-alkalinity water. ECHA registers it as aluminium sodium dioxide.
The most common NSF/ANSI/CAN 60 maximum use levels are 89 and 105 mg/L as product (NSF listings, 2026-10-21). Sodium aluminate is one of the coagulants in this reference of water treatment chemicals.
Three values decide a program: the dose basis (1 mg/L of a 45 % grade is about 0.40 mg/L as Na2Al2O4), the alkalinity added and the residual aluminum limit (0.05 to 2.9 mg/L by jurisdiction).
The identity card below summarizes the attributes that define sodium aluminate.
| Attribute | Value |
|---|---|
| Name | Sodium aluminate |
| Synonyms | Aluminate of soda, sodium aluminum oxide, aluminium sodium dioxide, sodium meta-aluminate, liquid sodium aluminate |
| CAS numbers | 1302-42-7; also 11138-49-1 (second registry number for the same substance) |
| EC numbers | 215-100-1 (1302-42-7); 234-391-6 (11138-49-1) |
| Formula | NaAlO2 (empirical); Na2Al2O4 (as used in AWWA B405 and ADWG) |
| Molar mass | 81.97 g/mol NaAlO2; 163.94 g/mol Na2Al2O4 (calculated) |
| Class | Alkaline aluminum salt |
| Function | Coagulant, alkalinity and pH source, softening aid, phosphorus precipitant, boiler water additive |
| Typical liquid | 45 % grade: 24.6 to 25.4 % Al2O3, pH 14 |
| NSF/ANSI/CAN 60 | Product-specific MUL; 89 and 105 mg/L as product most common (NSF listings, 2026-10-21) |
| AWWA standard | ANSI/AWWA B405-24 |
| EN standard | EN 882:2016 |
| GHS | No CLP Annex VI entry; notified (ECHA C&L): H314, H290, H318 (majority of notifications) |
| Transport | UN1819 Sodium aluminate, solution, class 8, PG II or III |
| Customs | HS 2841.90; US HTS 2841.90.40.00 |
Every value on this page is checked against primary sources (NSF listings, AWWA, CEN, eCFR, NHMRC, Health Canada, WHO, ECHA); see our methodology and fact-checking process.
What Is Sodium Aluminate?#
Sodium aluminate is aluminum held in a strongly alkaline, sodium hydroxide-rich solution, written NaAlO2 (81.97 g/mol) as the empirical formula and Na2Al2O4 (163.94 g/mol, calculated) in ANSI/AWWA B405 and the Australian Drinking Water Guidelines. Both registry numbers, CAS 1302-42-7 (EC 215-100-1) and CAS 11138-49-1 (EC 234-391-6), identify the same substance.
What keeps the aluminum dissolved at pH 14? Excess caustic does: ADWG liquids carry 8 to 13 % excess NaOH, and the 45 % grade holds a Na2O/Al2O3 molar ratio of 1.25 to 1.29 (USALCO 45 technical data sheet, REV2601).
Liquid or powder: which sodium aluminate grades are supplied?#
Liquids near 25 % Al2O3 are the sodium aluminate grades dosed in water treatment, while the powder contains 70 to 90 % Na2Al2O4 and is hygroscopic (ADWG). The 45 % liquid is amber, with a specific gravity of 1.54 to 1.57 at 15.6 °C (60 °F), 12.82 to 13.07 lb/US gal and a pH of 14. The 38 % liquid is stabilized against alumina precipitation.
The table below compares the sodium aluminate grades and their properties.
| Grade | Strength | Density | Appearance | Source |
|---|---|---|---|---|
| Liquid 45 % | 24.6 to 25.4 % Al2O3; 18.8 to 19.8 % Na2O; 39.6 to 40.8 % Na2Al2O4; Fe and SiO2 ≤ 200 ppm each | SG 1.54 to 1.57 at 15.6 °C (60 °F); 12.82 to 13.07 lb/US gal | Amber liquid, pH 14 | USALCO 45 TDS (REV2601) |
| Liquid 38 % | 38 % (product designation); stabilized against alumina precipitation | n/a | n/a | USALCO 38 % product page |
| Liquid (ADWG) | 29 to 35 % Na2Al2O4; 18 to 21 % Al2O3 equivalent; 8 to 13 % excess NaOH | SG 1.4 to 1.6 | Clear, colorless to pale amber | ADWG |
| Solid | 70 to 90 % Na2Al2O4 | n/a | White hygroscopic powder | ADWG |
How Does Sodium Aluminate Work as a Coagulant?#
Sodium aluminate coagulates by hydrolyzing in water to aluminum hydroxide floc and sodium hydroxide: Na2Al2O4 + 4 H2O → 2 Al(OH)3 + 2 NaOH (Veolia water handbook, chapter 7). The released sodium hydroxide raises pH instead of lowering it as alum does.
ADWG places it at the rapid mix, often fed together with alum. Charge neutralization, sweep floc and floc growth are explained under coagulation and flocculation in water treatment.
Why does sodium aluminate add alkalinity instead of consuming it?#
Each mg/L of sodium aluminate (88 % Na2Al2O4) raises alkalinity by 0.54 mg/L and reduces carbon dioxide by 0.47 mg/L (ADWG). Pure Na2Al2O4 supplies about 0.61 mg/L as CaCO3 per mg/L (calculated). The table below compares alkalinity effects by basis.
| Chemical | Basis | Alkalinity change, mg/L as CaCO3 | Source |
|---|---|---|---|
| Sodium aluminate (88 % Na2Al2O4) | Per mg/L product | +0.54 | ADWG |
| Sodium aluminate (pure Na2Al2O4) | Per mg/L Na2Al2O4 | +0.61 | Calculated |
| Sodium aluminate | Per mg/L Al delivered | About +1.85 | Calculated (0.61 x 163.94 / 53.96) |
| Alum, dry (Al2(SO4)3·14H2O) | Per mg/L dry alum | -0.50 | Stoichiometric (300 / 594.4) |
| Alum | Per mg/L Al delivered | -5.56 | Calculated |
| Sodium hydroxide | Per mg/L NaOH | +1.25 | Stoichiometric |
P and M alkalinity are measured as set out under alkalinity of water.
Where Is Sodium Aluminate Used? Drinking Water, Lime Softening and Wastewater#
Sodium aluminate is used in 3 water systems: drinking-water coagulation, lime softening and municipal wastewater phosphorus removal. The table below compares the systems by dose basis, feed point and control.
| System | Dose (basis) | Feed point | Control | Note | Source |
|---|---|---|---|---|---|
| Drinking water | 2 to 60 mg/L (ppm) as Na2Al2O4 | Rapid mix; often paired with alum | Jar test, pH, alkalinity, residual Al | Primary coagulant, especially in low-alkalinity water | ADWG |
| Lime softening | Jar test | Softener or solids-contact clarifier | Mg, silica, P and M alkalinity | Improves Mg and silica reduction in the cold process | Veolia handbook, ch. 7 |
| Municipal wastewater | Jar test; stoichiometric 0.87 mg Al per mg P | Program-specific | Total phosphorus | Phosphorus precipitation | USALCO; WaterWorld (supplier-authored) |
Drinking water: coagulation of low-alkalinity water#
Drinking-water plants dose sodium aluminate at 2 to 60 mg/L (ppm) as Na2Al2O4 at the rapid mix, according to the Australian Drinking Water Guidelines (NHMRC). That range equals about 1.2 to 37 mg/L as Al2O3 or 0.66 to 20 mg/L as Al (calculated), and ADWG rates 1 mg/L of Na2Al2O4 as equivalent to 3.5 mg/L of dry alum.
Enhanced coagulation under 40 CFR 141.135 sets TOC removal steps by raw-water alkalinity; the targets are tabulated under enhanced coagulation and TOC removal.
Lime softening: magnesium and silica reduction#
In lime softening, sodium aluminate improves magnesium reduction, and with it silica reduction, in the cold process, and supplies hydroxide without adding calcium hardness (Veolia water handbook, chapter 7). It is fed in the softener or solids-contact clarifier, and the dose is set by jar test. Cold, warm and hot process are compared under lime softening.
Wastewater: phosphorus and heavy-metal removal#
Municipal wastewater plants use sodium aluminate for phosphorus precipitation, setting the dose by jar test against total phosphorus (USALCO product information). The stoichiometric need is 0.87 mg Al per mg P at a 1:1 molar ratio (WaterWorld, supplier-authored), which equals about 2.6 mg Na2Al2O4, or about 6.6 mg of 45 % product, per mg P (calculated). Aluminum, iron and lime programs are compared under chemical phosphorus removal from wastewater.
Ixom also lists sodium aluminate for coagulating heavy metals such as arsenic, chromium and lead, a supplier claim without a published dose. Hydroxide and sulfide precipitation are covered under heavy metal removal from wastewater.
How Is the Sodium Aluminate Dose Calculated and Fed?#
The daily sodium aluminate feed equals dose x flow: 20 mg/L as Na2Al2O4 at 10 MGD (37,854 m³/d) is 757 kg/d (1,668 lb/day) of Na2Al2O4, or 1,883 kg/d (4,149 lb/day) of 45 % product (worked example, calculated). The formulas are lb/day = mg/L x MGD x 8.34 / purity (Florida DEP) and kg/d = mg/L x m³/d / 1,000 (EOCP). The purity of 0.402 is the midpoint Na2Al2O4 content of the 45 % grade.
The worked example below labels every input; all results are calculated.
| Worked example | Metric | US customary |
|---|---|---|
| Input: dose, as Na2Al2O4 | 20 mg/L | 20 ppm |
| Input: flow | 37,854 m³/d | 10 MGD |
| Input: Na2Al2O4 content of 45 % grade (purity) | 40.2 % | 0.402 |
| Input: specific gravity of liquid | 1.555 | 1.555 |
| Result: feed as Na2Al2O4 | 757 kg/d | 1,668 lb/day |
| Result: dose as product | 49.8 mg/L | 49.8 ppm |
| Result: product feed | 1,883 kg/d | 4,149 lb/day |
| Result: liquid volume | 1,211 L/d | 320 gal/d |
| Result: feed as Al2O3 | 471 kg/d | 1,037 lb/day |
| Result: feed as Al | 249 kg/d | 549 lb/day |
| Result: alkalinity added | About 12.2 mg/L as CaCO3 | About 12.2 ppm as CaCO3 |
How do you convert a sodium aluminate dose between product, Na2Al2O4, Al2O3 and Al?#
Multiply a dose as Na2Al2O4 by 0.622 for the dose as Al2O3 and by 0.329 for the dose as Al; a dose as product of the 45 % grade is about 0.40 times its value as Na2Al2O4. The factors follow from the molar masses (101.96 Al2O3, 2 x 26.98 Al, 163.94 Na2Al2O4).
The ADWG range of 2 to 60 mg/L as Na2Al2O4 is therefore about 5 to 149 mg/L as 45 % product (calculated). The most common NSF/ANSI/CAN 60 maximum use level, 89 mg/L as product, equals about 36 mg/L as Na2Al2O4, 22 mg/L as Al2O3 and 11.8 mg/L as Al; a plant dosing at the ADWG upper end exceeds an 89 mg/L listing. The dosage and feed rate calculator converts any dose and flow.
Why does cold weather change liquid sodium aluminate feed?#
Liquid sodium aluminate thickens sharply as it cools, from 110 cP at 43 °C (109 °F) to 1,500 cP at 13 °C (55 °F) for the 45 % grade, so plants store and feed it warm, indoors or in heated tanks (USALCO 45 technical data sheet). The table below lists the viscosity of the 45 % grade by temperature.
| Temperature | Viscosity of 45 % grade |
|---|---|
| 43 °C (109 °F) | 110 cP |
| 32 °C (90 °F) | 250 cP |
| 21 °C (70 °F) | 700 cP |
| 13 °C (55 °F) | 1,500 cP |
Pump types for viscous alkaline liquids are compared under chemical dosing pumps.
How Is Sodium Aluminate Coagulation Controlled? pH, Alkalinity and Residual Aluminum#
Plants control sodium aluminate coagulation with 4 measurements: jar tests, coagulation pH, alkalinity and residual aluminum (ADWG). Coagulation pH is corrected with acid or alkali, never by overdosing coagulant (Irish EPA). The 4 measurements and what each shows are listed below.
- Jar tests set the dose on the actual raw water, stated as product and as Na2Al2O4.
- Coagulation pH rises with the dose, because each mg/L releases hydroxide.
- Alkalinity confirms the gain, about +0.54 mg/L per mg/L of 88 % product (ADWG).
- Residual aluminum is checked against the 2 mg/L NSF condition and the 0.05 to 0.2 mg/L US SMCL.
How is sodium aluminate dosed in a jar test?#
A jar test doses neat liquid with a micropipette: 10 mg/L as product in a 2 L jar needs about 12.9 µL of a 45 % grade at specific gravity 1.555 (worked example, calculated). The formula is µL = mg/L x jar liters / SG (USALCO jar testing procedure). Mixing speeds and reading the jars follow the jar test procedure.
What Is Sodium Aluminate Compatible With? Alum, Acids, Alkalis and Metals#
Sodium aluminate is fed together with alum in low-alkalinity water, but it reacts exothermically with acids and corrodes some metals. The 3 interaction groups are listed below.
- Aluminum coagulants: alum at the rapid mix, where sodium aluminate offsets part of the alkalinity alum consumes (ADWG).
- Acids: contact with any acid causes an exothermic reaction (CAMEO).
- Metals: the solution is corrosive to metals, yet ADWG lists iron, steel and stainless steel among suitable storage materials, so compatibility depends on the metal.
Caustic soda is the other common alkalinity source; sodium hydroxide (caustic soda) adds 1.25 mg/L as CaCO3 per mg/L, against 0.61 for Na2Al2O4.
Which Standards Cover Sodium Aluminate? NSF/ANSI/CAN 60, AWWA B405 and EN 882#
Three documents govern sodium aluminate for drinking water: NSF/ANSI/CAN 60 for health effects, ANSI/AWWA B405-24 for product quality in North America and EN 882:2016 in Europe. The table below compares them by scope, edition and key requirement.
| Document | Scope | Edition or status | Key requirement for sodium aluminate |
|---|---|---|---|
| NSF/ANSI/CAN 60 | Direct drinking-water additives, health effects | Listings read 2026-10-21 | Product-specific MUL as product: 89 and 105 mg/L most common, range 40 to 250 mg/L; condition [AL]: aluminum in finished water ≤ 2 mg/L |
| ANSI/AWWA B405-24 | Sodium aluminate for potable water, wastewater and reclaimed water | Current; replaces B405-16 | Minimum physical, chemical, sampling, testing, packaging and shipping requirements |
| EN 882:2016 | Sodium aluminate for water intended for human consumption | Current; supersedes EN 882:2004 | European product standard; see EN standards for drinking water treatment chemicals |
| prEN 882:2025 | Revision of EN 882 | Draft at enquiry stage, not a standard | None until published |
What is the NSF/ANSI/CAN 60 maximum use level for sodium aluminate?#
No single NSF/ANSI/CAN 60 limit exists for sodium aluminate: maximum use levels are product-specific, with 89 mg/L (62 rows) and 105 mg/L (50 rows) as product the most common, followed by 40 mg/L (7 rows) and 100 mg/L (6 rows) (NSF listings, 2026-10-21). Listed values range from 40 to 250 mg/L as product (listings read 2026-10-20); 89 mg/L applies to 43 % and 45 % grades, 105 mg/L to 38 % grades and 173 mg/L to Kemira SAX-20. Two rows also list the function pH adjustment.
The sodium aluminate listings cover 21 companies, 55 products (company plus trade designation) and 135 product-function rows (NSF listings, 2026-10-21). The binding figure is the label MUL, summed over all application points; certification lapses on repackaging, dilution or blending at an uncertified site. NSF/ANSI/CAN 60 is required in 49 US states (NSF survey of ASDWA members). MULs, listings and the [AL] condition are covered under NSF/ANSI/CAN 60 certification.
What do ANSI/AWWA B405-24 and EN 882:2016 cover?#
ANSI/AWWA B405-24 is the current AWWA standard for sodium aluminate, setting minimum physical, chemical, sampling, testing, packaging and shipping requirements for use in potable water, wastewater and reclaimed water. It replaces B405-16 (and B405-06); its comment period ran from 2023-11-03 to 2023-12-18. USALCO states that its 45 % grade meets B405-24. B405 sits in the coagulation group of the AWWA B-series standards with B403 and B408.
EN 882:2016 is the European product standard for sodium aluminate, superseding EN 882:2004. Its revision, prEN 882:2025, is a draft at the enquiry stage and not yet a standard.
What Is the Regulatory Status of Sodium Aluminate?#
Sodium aluminate is not a biocide under the EU Biocidal Products Regulation and is listed in 21 CFR 173.310 as a boiler water additive; in drinking water, NSF/ANSI/CAN 60 certification and the aluminum left in finished water regulate it (status 2026-10-20). Coagulation beside disinfection and corrosion control is shown under drinking water treatment chemicals.
The table below compares the aluminum values and listings that apply to sodium aluminate, with their type (status 2026-10-20).
| Instrument | Value | Type | Reference |
|---|---|---|---|
| NSF/ANSI/CAN 60 [AL] | Aluminum in finished water ≤ 2 mg/L | Certification condition | NSF listings |
| US secondary standard | Aluminum 0.05 to 0.2 mg/L | SMCL, non-enforceable | 40 CFR 143.3 under the Safe Drinking Water Act |
| European Union | Aluminum 200 µg/L | Indicator parameter | Annex I Part C of the EU Drinking Water Directive 2020/2184 |
| Health Canada (March 2021) | MAC 2.9 mg/L total aluminum; operational guidance value 0.100 mg/L (locational running annual average) | Guideline | Guidelines for Canadian Drinking Water Quality |
| WHO (2010) | No guideline value; health-based value 0.9 mg/L; practicable levels ≤ 0.1 mg/L (large plants) and ≤ 0.2 mg/L (small facilities) | Guidance | WHO/HSE/WSH/10.01/13, see WHO guidelines for drinking-water quality |
| EU BPR | Not a biocide | n/a | Product status |
| 21 CFR 173.310(c) | Listed as a boiler water additive, no limitation beyond the functional amount | Food-contact steam | eCFR, current to 2026-10-16 |
Is sodium aluminate listed in 21 CFR 173.310 for boiler water?#
Yes: sodium aluminate is listed in 21 CFR 173.310(c) as a boiler water additive with no limitation beyond the functional amount of paragraph (a) (eCFR, current to 2026-10-16). Feedwater and internal programs are covered under boiler water treatment. Aluminum sulfate, aluminum chloride, polyaluminum chloride, aluminum chlorohydrate, ferric and ferrous salts, polyamine and polyDADMAC are not listed in 21 CFR 173.310; the full list and limits are set out under 21 CFR 173.310 boiler water additives.
How Should Sodium Aluminate Be Handled and Stored Safely?#
Sodium aluminate is a strongly alkaline liquid (pH 14 as supplied) that reacts exothermically with acids and is corrosive to metals. ADWG lists iron, fiberglass-reinforced plastic, polyethylene, rubber, steel, stainless steel and concrete as storage materials.
Heated or indoor storage is usual because the 45 % grade reaches 1,500 cP at 13 °C (55 °F). Protective equipment and spill response follow the supplier SDS. Containment and heating by chemical are covered under chemical storage tanks.
The table below summarizes sodium aluminate storage and handling data.
| Item | Value |
|---|---|
| pH as supplied | 14 (45 % grade) |
| Specific gravity | 1.54 to 1.57 at 15.6 °C (60 °F) for the 45 % grade; 1.4 to 1.6 (ADWG liquid) |
| Tank materials | Iron, FRP, polyethylene, rubber, steel, stainless steel, concrete (ADWG) |
| Temperature | Heated or indoor storage; 1,500 cP at 13 °C (55 °F) for the 45 % grade |
| Incompatible | Acids (exothermic reaction); corrosive to metals |
| GHS | No CLP Annex VI entry; notified (ECHA C&L): H314, H290, H318; Danger; GHS05 |
| Transport | UN1819, class 8, PG II or III (solution); UN2812, class 8, PG III (solid, air only) |
| Handling details | Supplier SDS |
What does a sodium aluminate safety data sheet (SDS) cover?#
A sodium aluminate safety data sheet classifies the product as corrosive (signal word Danger, pictogram GHS05) and gives its transport entry, UN1819 Sodium aluminate, solution, class 8, packing group II or III by concentration. ECHA lists no CLP Annex VI (harmonised) entry; the notified classification (ECHA C&L) is H314 (97.7 % of notifications), H290 (79.7 %) and H318 (73.1 %), and a minority of 10.2 % also notify H271. Solid sodium aluminate ships as UN2812, class 8, packing group III, regulated only for air transport (49 CFR 172.101), and customs classify it under HS 2841.90 (US HTS 2841.90.40.00).
Check the 4 items below against the delivered grade.
- Confirm the product name, both CAS numbers and the Al2O3 strength against the certificate of analysis.
- Compare the hazard section with the notified H314, H290 and H318 classification.
- Check the UN number and packing group in the transport section.
- Match the storage temperature and materials with the plant's tank and feed system.
What Are the Alternatives to Sodium Aluminate?#
The 3 main alternatives are alum and polyaluminum chloride in coagulation and hydrated lime in softening; they consume alkalinity or add calcium. The table below compares sodium aluminate with 5 alternatives (NSF listings, 2026-10-20).
| Chemical | CAS | Typical strength | Alkalinity effect, mg/L as CaCO3 | Most common NSF MUL (as product) | AWWA | EN |
|---|---|---|---|---|---|---|
| Sodium aluminate | 1302-42-7 (also 11138-49-1) | 45 % liquid: 24.6 to 25.4 % Al2O3 | Adds 0.54 per mg/L (88 % product) | 89 and 105 mg/L | B405-24 | EN 882:2016 |
| Alum (aluminum sulfate) | 10043-01-3 | Liquid 7.5 to 8.4 % Al2O3 | Consumes 0.50 per mg/L dry alum | 150 mg/L | B403-24 | EN 878:2016 |
| Polyaluminum chloride | 1327-41-9 | ≥ 10 % Al2O3, about 50 % basicity, pH 2.2 to 2.8 | Consumes less than alum | 250 mg/L | B408-25 | EN 17034:2018 |
| Aluminum chlorohydrate (ACH) | 12042-91-0 | 23 to 24 % Al2O3, 83 to 84 % basicity | Consumes little (83 to 84 % basicity) | 250 mg/L | Supplied against B408 | EN 17034:2018 |
| Ferric chloride | 7705-08-0 | 38 to 42 % FeCl3 (US NSF products) | Consumes 0.92 per mg/L FeCl3 | 250 mg/L | B407-24 | EN 888:2023 |
| Hydrated lime | 1305-62-0 | 95 to 98 % Ca(OH)2 | Adds 1.35 per mg/L, with calcium | 650 mg/L (dry) | B202-25 | EN 12518:2014 |
Sodium aluminate vs alum (aluminum sulfate)#
Both deliver aluminum, but alum consumes about 5.56 mg/L alkalinity as CaCO3 per mg/L Al, while sodium aluminate adds about 1.85 (calculated), which is why ADWG pairs them in low-alkalinity water. ADWG counts 1 mg/L of Na2Al2O4 as equivalent to 3.5 mg/L of dry alum. Alum grades, doses and MULs are covered under aluminum sulfate (alum).
Sodium aluminate vs polyaluminum chloride (PAC)#
Polyaluminum chloride is acidic (pH 2.2 to 2.8 as supplied), while sodium aluminate is alkaline (pH 14). PAC consumes less alkalinity than alum because about half its aluminum is prehydrolyzed, and its most common NSF/ANSI/CAN 60 MUL is 250 mg/L as product against 89 and 105 mg/L. Basicity and cold-water use are covered under polyaluminum chloride (PAC).
Sodium aluminate vs hydrated lime in softening#
Hydrated lime adds hydroxide together with calcium (1.35 mg/L alkalinity as CaCO3 per mg/L Ca(OH)2), while sodium aluminate supplies hydroxide without calcium hardness and improves magnesium and silica reduction in cold-process softening (Veolia water handbook, chapter 7). Lime grades, slurry feed and MULs are on hydrated lime.
Sodium Aluminate Grades, Suppliers and Sourcing#
Sodium aluminate is supplied mainly as 38 % and 45 % liquids; the 6 producers named in public sources are listed alphabetically below, without ranking. The NSF/ANSI/CAN 60 listings name 21 companies for the chemical (NSF listings, 2026-10-21).
| Producer (alphabetical) | Sodium aluminate products named in public sources |
|---|---|
| Alumichem | Not specified |
| Chemtrade | Lists sodium aluminate among its water solutions products |
| Holland Company | Not specified |
| Ixom | Sodium aluminate for coagulation, including heavy metals |
| Kemira | SAX-20 (NSF MUL 173 mg/L), SAX-23 |
| USALCO | 38 % and 45 % liquids (NSF MUL 105 and 89 mg/L) |
Other trade names in the NSF listings include Hanfloc 45, AluSAL 45 B, SA-380F, ZetaSOL 9802, Natral and Dynaflock L. Distributors and producers by region are listed under water treatment chemical suppliers.
Indian producers of treatment chemicals are listed under water treatment chemical manufacturers in India.
How is sodium aluminate priced and quoted?#
Compare sodium aluminate offers per unit of Al2O3 (or Na2Al2O4) at the quoted strength, because a 45 % liquid at 24.6 to 25.4 % Al2O3 and an ADWG-type liquid at 18 to 21 % Al2O3 deliver different aluminum per tonne. Quotes depend on strength, volume and container (drum, IBC or bulk), freight, heated delivery, contract term and the specification (B405-24 or EN 882:2016, NSF/ANSI/CAN 60 MUL). Send one specification and compare offers on the same basis through request quotes for water treatment chemicals.
Where Does Sodium Aluminate Sit Among Coagulants for Water Treatment?#
Sodium aluminate is the alkaline member of the inorganic aluminum coagulants, beside alum, polyaluminum chloride and aluminum chlorohydrate. All 4 coagulant classes (inorganic, prehydrolyzed, organic and natural) are compared under coagulants for water treatment. Aluminum and iron salts are compared under inorganic coagulants.
Sodium aluminate FAQs#
Is sodium aluminate a salt?#
Yes: sodium aluminate is an alkaline aluminum salt with the empirical formula NaAlO2.
Is sodium aluminate soluble in water?#
Yes: sodium aluminate dissolves to a corrosive alkaline solution and hydrolyzes to aluminum hydroxide and sodium hydroxide.
Alkalis and acids dosed beside it are compared under pH adjustment chemicals.
Is sodium aluminate toxic?#
Sodium aluminate is classified as corrosive: the notified ECHA C&L classification is H314 and H318 for skin and eye damage, plus H290.
Is sodium meta-aluminate the same chemical?#
Yes: sodium meta-aluminate is a synonym for sodium aluminate, NaAlO2.