Raw, Milled and Granular



GYPSOS is certified, eco friendly anhydrous calcium sulphate (anhydrite), produced by Fluorsid in its fluorochemical sites of Cagliari, Treviglio and Odda.

Gypsos is obtained from the reaction of dried acid grade Fluorspar (CaF2 97%) and Sulphuric Acid (H2SO4) during the production of Hydrogen Fluoride (HF): CaF2(solid) + H2SO4(liquid) —› 2HF (gas) + CaSO4(solid)

Prior to be sent to further processes or storage, GYPSOS is neutralized with a small excess of lime.

Its physical and mechanical features can be adjusted depending on the specific needs, to make it suitable for different applications, in building, cement and fertilizer industries.

In the building industry, it is widely used for the production of self-levelling screeds. GYPSOS milled is also an excellent alternative to cement in many non-structural concretes and mortars, as well as in various indoor applications as plasters, blocks for fire system solutions and aerated concrete.

In the cement industry, it is used as an alternative to natural gypsum, FGD gypsum and phosphogypsum, as an additive to regulate cement’s setting time.

In fertilizers’ production, it is an excellent calcium and SO3-bearing raw material. GYPSOS based fertilizers help to improve the soil structure and workability and balance the uptake of nutrients and minerals.



GYPSOS is available in 3 forms:


GYPSOS Raw is neutralized anhydrous calcium sulphate which is no further processed into the milled or granular forms…


GYPSOS Milled is synthetic anhydrous calcium sulphate (CaSO4) obtained from the production of Hydrogen Fluoride (HF) with prime-quality raw materials only…


GYPSOS Granular is synthetic anhydrous calcium sulphate (CaSO4) pelletized with water (max 10%)…


To report directly to our registered office, please write to:

Area Industriale di Cagliari
2a Strada Macchiareddu
09032 Assemini (CA)

Please state on the envelope COMPLAINT / REPORT SA8000 or COMPLAINT / ANTI-CORRUPTION REPORT 37001 – Code of Ethics – MOGC 231 depending on the subject matter of the report

You can also use the following reporting channels provided by Fluorsid S.p.A

For SA8000 Reports

Via e-mail through the dedicated account:

Certification Body:

  • Bureau Veritas Italia Spa, divisione Certificazione –
    Responsabile CSR, viale Monza, 347 – 20126 Milano
    Fax +39 02 2552980 | E mail

Accreditation Body:

  • SAAS Social Accountability Accreditation Services, (SAAS): 9 East, 37th Street, 10th Floor – New York, NY 10016 | tel: (212) 391-2106 | e-mail:

For Anti-Corruption Reports 37001 / Code of Ethics / Model 231

  • per posta elettronica –
  • ordinary email – Area Industriale di Cagliari 2a Strada Macchiareddu 09032 Assemini (CA) – Italia – reserved for the attention of the Organismo di Vigilanza 
  • through the platform (, accessible to people both inside and outside the company.

Thanks to:

Ing. Michele Lavanga

tech contents

Angelo Castellaneta