CLP Envisystems Pte Ltd and Circuits-Base Chemicals Pte Ltd



About us


CLP Envisystems Pte Ltd and Circuits-Base Chemicals Pte Ltd are both subsidiary of the Chin Leong  Group of companies. CLP Envisystems provides analysis and jar tests in water and waste water analysis for coagulant and flocculant selection of suitable grades and in Singapore.


Ferric Chloride is the inorganic compound with the formula (FeCl
3). Also called Iron(III) chloride , it is a common compound of iron in the +3 oxidation state. The anhydrous compound is a crystalline solid with a melting point of 307.6 °C. The color depends on the viewing angle: by reflected light the crystals appear dark green, but by transmitted light they appear purple-red.


Ferric Chloride or Iron (III) Chloride (FeCl3) is used as a flocculant in sewage treatment and drinking water production. When small quantities of ferric chloride are added to the raw water, iron(III) hydroxide precipitates and adsorbs finely divided solids and colloids.

It is usually produced and marketed as a concentrated solution with a minimum concentration of 38% w/w. Starting from this solution is also possible to produce a solid crystallized Ferric Chloride with 37°C melting point.

Since 1985, Circuits Based Chemicals developed know-how and technologies for ferric chloride recycling and production. We are the only  local Singapore based manufacturer and key supplier of Ferric Chloride. minimum of 38% w/w solution production plants, both for waste water treatment and drinking water grades as well for printed circuit board (PCB’s) etching processes.

Circuits Based Chemicals provide for some different processes to produce ferric chloride, according to the feedstock:

  • Iron scraps and chlorine gas, by ferric chloride recycling
  • Soft iron and chlorine gas, by ferric chloride recycling
  • Ferric oxide and hydrochloric acid

The raw materials are likewise cheap and easily available so that the manufacture of ferric chloride is frequently an attractive supplement for chlor-alkali producers.

Contact for a quotation today.



Ferric Chloride is a Hazardous Substances.

Hazardous substances controlled by NEA have mass-disaster potential, are highly toxic and pollutive, and/or generate toxic wastes that are difficult to dispose. The agency controls environmentally hazardous chemicals under The Environmental Protection and Management Act (EPMA), The Environmental Protection and Management (Hazardous Substances) Regulations and the Environmental Protection and Management (Ozone Depleting Substances) Regulations.

Hazardous substance requirements


Any person who wishes to import, sell or export, any hazardous substance controlled under the EPMA must obtain a Hazardous Substances Licence.


To apply for HS licence, click here for NEA access


Any person who wishes to transport any hazardous substance in quantities exceeding those specified in The Environmental Protection and Management (Hazardous Substances) Regulations must possess a valid Hazardous Substances Licence before applying for transport approval. To seek further support and enquire, please enquire through