CAS 1327-41-9
Poly Aluminium Chloride
Poly Aluminium Chloride (PAC) is a pre-hydrolysed inorganic coagulant used to clarify drinking water and treat industrial effluent, working faster and across a wider pH range than alum.
PAC is a polymerised form of aluminium chloride in which part of the chloride has already been replaced by hydroxide. That pre-hydrolysis — expressed as basicity — is what makes it work: the aluminium arrives already in charged polymeric species, so it destabilises colloids almost instantly, forms dense, fast-settling floc and consumes far less of the water's natural alkalinity than aluminium sulphate.
In practice this means lower doses, a working pH window of roughly 5 to 9, less sludge and lower residual aluminium in the treated water. It is supplied as a yellow spray-dried powder with around 30% Al₂O₃, which suits long export routes, or as a liquid at 10% or 17% Al₂O₃ for plants that dose directly from tank.
- CAS number
- 1327-41-9
- Synonyms
- PAC
- Grades / forms
- 10% / 17% Al₂O₃, liquid & powder
- Industries
- Water Treatment
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Typical applications
- Potable water clarification and turbidity removal
- Colour removal from textile and dye-house effluent
- Phosphate reduction in municipal sewage
- Retention and sizing aid in paper mills
- Oily and emulsified wastewater treatment
- Coagulation ahead of sand filters and UF/RO pre-treatment
Packing options
- 25 kg PE-lined bags (powder)
- 1,000 kg jumbo bags (powder)
- 250 kg HDPE drums (liquid)
- 1,000 L IBCs (liquid)
Storage & handling
Powder is hygroscopic: keep bags sealed, off the floor and away from humidity. Liquid PAC is mildly acidic and corrosive to mild steel — store in HDPE or FRP tanks and use within about six months.
Documentation
Certificate of Analysis, MSDS, Certificate of Origin, dangerous goods declaration where applicable, and third-party pre-shipment inspection on request.
Typical specification
- Al₂O₃ content
- Liquid 10% or 17%; powder 28–30%
- Basicity
- 40–90% (grade dependent)
- pH (1% solution)
- 3.5–5.0
- Water-insoluble matter
- ≤ 0.5% (powder)
- Appearance
- Pale yellow powder or clear to pale yellow liquid
Typical values for reference. The exact specification is agreed before the order and confirmed on the Certificate of Analysis for each batch.
Poly Aluminium Chloride — frequently asked
Poly Aluminium Chloride usually works at a lower dose than aluminium sulphate, across a wider pH range (about 5–9), consumes less alkalinity, settles faster and leaves less sludge and lower residual aluminium. Alum is cheaper per kilogram, but PAC is often cheaper per cubic metre of water treated.
High-basicity PAC (around 70% and above) performs best on low-turbidity and cold water and gives the lowest residual aluminium. Medium-basicity grades handle high-turbidity raw water and effluent well. A jar test on your own water is the reliable way to decide, and samples are available for that purpose.
Powder carries roughly three times the Al₂O₃ per kilogram shipped and keeps for a year or more when dry, so it is the economical choice for export. Liquid PAC avoids make-up tanks and dissolving, and suits plants close to the point of production with direct dosing.
Yes. Chemtrade manufactures and exports Poly Aluminium Chloride (CAS 1327-41-9) from Surat, Gujarat, India to more than 55 countries, for customers in Water Treatment. Send your grade, quantity and destination port for a quotation within one business day.
Every shipment of Poly Aluminium Chloride from Chemtrade includes a batch-specific Certificate of Analysis (COA) and Material Safety Data Sheet (MSDS). Certificate of Origin, third-party pre-shipment inspection and destination-specific regulatory documentation are arranged on request.
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