Are liquid ACH and powder ACH equivalent on an equal-weight basis?

No. Liquid ACH contains water and is specified by concentration and density, whereas powder must be dissolved. Compare on agreed aluminium or Al2O3 content and basicity, then confirm the intended dilution and feed conditions.

Which properties should be aligned when comparing ACH coagulant grades?

Compare aluminium or Al2O3 content, basicity, density for liquid grades, chloride, pH and water-insoluble matter using aligned methods. Application-specific impurity limits should also match the intended water-treatment program; equal Al2O3 alone is not sufficient.

Can a water-treatment ACH grade be selected automatically for antiperspirant formulation?

No. The application requires an appropriate grade identity, physical form and specified impurity limits. Confirm the finished-product and market requirements separately before selecting an ACH grade for personal-care formulation.

Aluminum Chlorohydrate (ACH) CAS 12042-91-0

Aluminum Chlorohydrate (ACH, CAS 12042-91-0, EC 234-933-1) is a high-basicity aluminum hydroxychloride used in water-treatment coagulation and, in specification-appropriate grades, personal-care formulations. Commercial ACH is a hydrated/polymeric material supplied in different solid or solution forms rather than a single fixed-purity molecule. Form, aluminum or Al₂O₃ content, chloride, basicity, pH and packaging should be confirmed for the supplied grade. For a polymeric aluminium coagulant used mainly in water clarification, Polyaluminum Chloride (PAC) is a related option to compare by Al₂O₃ content, basicity and treatment program.

CAS: 12042-91-0
Synonyms: Aluminum chlorohydrate, ACH, Basic aluminum chloride, Polymeric aluminum chloride hydroxide
Einecs: 234-933-1
Molecular Formula: General formula AlnCl(3n-m)(OH)m; commercial grades are hydrated aluminum complexes
Grade: Confirm supply form, aluminum or Al2O3 content, basicity, chloride, pH and application-specific limits
Package: Confirm packaging for the selected solid or solution grade and destination

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Product Description

1 Product Overview

2 Product Information / Specifications

3 Physical & Chemical Properties

Product Overview

Aluminum Chlorohydrate (ACH) is supplied as a high-basicity inorganic coagulant for water clarification and particle removal systems. It is commonly applied in drinking water, process water, and municipal or industrial treatment operations where stable coagulation performance and efficient solids separation are required.

Commercial ACH is a hydrated, polymeric material supplied in different solid or solution forms rather than a single fixed-purity molecule. Confirm the supply form, aluminum or Al₂O₃ content, chloride, basicity, pH and packaging for the selected grade.

Product Information / Specifications

Product Name	Aluminum Chlorohydrate (ACH)
CAS Number	12042-91-0
Product Identity	Inorganic coagulant; specification-dependent personal-care ingredient
Chemical Type	High-basicity aluminum hydroxychloride
Synonyms	ACH, Aluminum chlorohydrate, Basic aluminum chloride
Molecular Formula	Al₂(OH)₅Cl (idealized formula; commercial grades are hydrated/polymeric)
Supply Form	Confirm liquid or solid supply form and the concentration basis for the selected product.
Grade Availability	Confirm supply form, aluminum or Al2O3 content, basicity, chloride, pH and application-specific limits
Technical Documents	COA, TDS, and SDS may be provided according to the supplied grade

Physical & Chemical Properties

Appearance	Typically supplied as white to slightly yellow powder, or as a clear to yellowish liquid depending on supply form
Solubility	Readily soluble in water
Functional Character	Polymeric aluminum coagulant with high basicity
Handling Characteristics	Aqueous solutions may show corrosive behavior and should be handled with compatible equipment
Typical Specification	Key parameters such as alumina content, basicity, and density may vary by grade and supply form

Applications

Drinking-water coagulation only when the supplied grade and local treatment requirements are confirmed.
Municipal water treatment systems requiring stable floc formation and efficient solids separation.
Industrial process water treatment where turbidity control and clarification performance are required.
Raw-water and surface-water clarification programs using an approved aluminum coagulant grade.
General water clarification programs where a high-basicity coagulant is selected for treatment optimization.

For related aluminum-based coagulant raw materials, see Polyaluminum Chloride and Aluminium Sulfate.

Packaging

Confirm packaging for the selected solid or solution grade and destination

Storage Conditions

Store in a cool, dry, and well-ventilated place in tightly closed containers. Avoid prolonged exposure to direct sunlight, excessive heat, and moisture.

Storage conditions and container selection should match the supplied form. For liquid products, corrosion-resistant storage tanks and transfer systems are generally used.

Safety Precautions

Avoid contact with skin, eyes, and clothing during handling.
Use suitable protective gloves, goggles, and work clothing.
Provide appropriate ventilation and avoid unnecessary exposure to dust or mist.
Use compatible corrosion-resistant equipment for storage and transfer where required.
Handle and store in accordance with the applicable SDS and site safety procedures.

FAQ - Technical & Supply Chain

Q:
Are liquid ACH and powder ACH equivalent on an equal-weight basis?

A: No. Liquid ACH contains water and is specified by concentration and density, whereas powder must be dissolved. Compare on agreed aluminium or Al2O3 content and basicity, then confirm the intended dilution and feed conditions.
Q:
Which properties should be aligned when comparing ACH coagulant grades?

A: Compare aluminium or Al2O3 content, basicity, density for liquid grades, chloride, pH and water-insoluble matter using aligned methods. Application-specific impurity limits should also match the intended water-treatment program; equal Al2O3 alone is not sufficient.
Q:
Can a water-treatment ACH grade be selected automatically for antiperspirant formulation?

A: No. The application requires an appropriate grade identity, physical form and specified impurity limits. Confirm the finished-product and market requirements separately before selecting an ACH grade for personal-care formulation.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

Quotation

Send the CAS number, grade, quantity, packing preference and destination.

Sample & Supply

Support is available for samples, trial orders, bulk and repeat supply.

Storage & Shipping

Product-specific conditions are confirmed before order.

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